diff --git a/llvm/include/llvm/Support/Compiler.h b/llvm/include/llvm/Support/Compiler.h
--- a/llvm/include/llvm/Support/Compiler.h
+++ b/llvm/include/llvm/Support/Compiler.h
@@ -117,11 +117,17 @@
 /// not accessible from outside it.  Can also be used to mark variables and
 /// functions, making them private to any shared library they are linked into.
 /// On PE/COFF targets, library visibility is the default, so this isn't needed.
+///
+/// LLVM_EXTERNAL_VISIBILITY - classes, functions, and variables marked with
+/// this attribute will be made public and visible outside of any shared library
+/// they are linked in to.
 #if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) &&              \
     !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_WIN32)
 #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
+#define LLVM_EXTERNAL_VISIBILITY __attribute__ ((visibility("default")))
 #else
 #define LLVM_LIBRARY_VISIBILITY
+#define LLVM_EXTERNAL_VISIBILITY
 #endif
 
 #if defined(__GNUC__)
diff --git a/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp b/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
--- a/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
+++ b/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
@@ -1298,7 +1298,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeAArch64AsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAArch64AsmPrinter() {
   RegisterAsmPrinter<AArch64AsmPrinter> X(getTheAArch64leTarget());
   RegisterAsmPrinter<AArch64AsmPrinter> Y(getTheAArch64beTarget());
   RegisterAsmPrinter<AArch64AsmPrinter> Z(getTheARM64Target());
diff --git a/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp b/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
--- a/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp
@@ -154,7 +154,7 @@
                         cl::desc("Enable the AAcrh64 branch target pass"),
                         cl::init(true));
 
-extern "C" void LLVMInitializeAArch64Target() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAArch64Target() {
   // Register the target.
   RegisterTargetMachine<AArch64leTargetMachine> X(getTheAArch64leTarget());
   RegisterTargetMachine<AArch64beTargetMachine> Y(getTheAArch64beTarget());
diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -5515,7 +5515,7 @@
 }
 
 /// Force static initialization.
-extern "C" void LLVMInitializeAArch64AsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAArch64AsmParser() {
   RegisterMCAsmParser<AArch64AsmParser> X(getTheAArch64leTarget());
   RegisterMCAsmParser<AArch64AsmParser> Y(getTheAArch64beTarget());
   RegisterMCAsmParser<AArch64AsmParser> Z(getTheARM64Target());
diff --git a/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp b/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
--- a/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
+++ b/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
@@ -277,7 +277,7 @@
                                        SymbolLookUp, DisInfo);
 }
 
-extern "C" void LLVMInitializeAArch64Disassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAArch64Disassembler() {
   TargetRegistry::RegisterMCDisassembler(getTheAArch64leTarget(),
                                          createAArch64Disassembler);
   TargetRegistry::RegisterMCDisassembler(getTheAArch64beTarget(),
diff --git a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp
--- a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp
+++ b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp
@@ -366,7 +366,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeAArch64TargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAArch64TargetMC() {
   for (Target *T : {&getTheAArch64leTarget(), &getTheAArch64beTarget(),
                     &getTheAArch64_32Target(), &getTheARM64Target(),
                     &getTheARM64_32Target()}) {
diff --git a/llvm/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp b/llvm/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
--- a/llvm/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
+++ b/llvm/lib/Target/AArch64/TargetInfo/AArch64TargetInfo.cpp
@@ -31,7 +31,7 @@
   return TheARM64_32Target;
 }
 
-extern "C" void LLVMInitializeAArch64TargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAArch64TargetInfo() {
   // Now register the "arm64" name for use with "-march". We don't want it to
   // take possession of the Triple::aarch64 tags though.
   TargetRegistry::RegisterTarget(getTheARM64Target(), "arm64",
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp b/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
--- a/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
@@ -90,7 +90,7 @@
   return new AMDGPUAsmPrinter(tm, std::move(Streamer));
 }
 
-extern "C" void LLVMInitializeAMDGPUAsmPrinter() {
+extern "C" void LLVM_EXTERNAL_VISIBILITY LLVMInitializeAMDGPUAsmPrinter() {
   TargetRegistry::RegisterAsmPrinter(getTheAMDGPUTarget(),
                                      llvm::createR600AsmPrinterPass);
   TargetRegistry::RegisterAsmPrinter(getTheGCNTarget(),
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -183,7 +183,7 @@
   cl::init(true),
   cl::Hidden);
 
-extern "C" void LLVMInitializeAMDGPUTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTarget() {
   // Register the target
   RegisterTargetMachine<R600TargetMachine> X(getTheAMDGPUTarget());
   RegisterTargetMachine<GCNTargetMachine> Y(getTheGCNTarget());
diff --git a/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp b/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
--- a/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
+++ b/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
@@ -6980,7 +6980,7 @@
 }
 
 /// Force static initialization.
-extern "C" void LLVMInitializeAMDGPUAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUAsmParser() {
   RegisterMCAsmParser<AMDGPUAsmParser> A(getTheAMDGPUTarget());
   RegisterMCAsmParser<AMDGPUAsmParser> B(getTheGCNTarget());
 }
diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
@@ -1252,7 +1252,7 @@
   return new AMDGPUDisassembler(STI, Ctx, T.createMCInstrInfo());
 }
 
-extern "C" void LLVMInitializeAMDGPUDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUDisassembler() {
   TargetRegistry::RegisterMCDisassembler(getTheGCNTarget(),
                                          createAMDGPUDisassembler);
   TargetRegistry::RegisterMCSymbolizer(getTheGCNTarget(),
diff --git a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.cpp b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.cpp
--- a/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.cpp
+++ b/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCTargetDesc.cpp
@@ -134,7 +134,7 @@
   return new AMDGPUMCInstrAnalysis(Info);
 }
 
-extern "C" void LLVMInitializeAMDGPUTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTargetMC() {
 
   TargetRegistry::RegisterMCInstrInfo(getTheGCNTarget(), createAMDGPUMCInstrInfo);
   TargetRegistry::RegisterMCInstrInfo(getTheAMDGPUTarget(), createR600MCInstrInfo);
diff --git a/llvm/lib/Target/AMDGPU/TargetInfo/AMDGPUTargetInfo.cpp b/llvm/lib/Target/AMDGPU/TargetInfo/AMDGPUTargetInfo.cpp
--- a/llvm/lib/Target/AMDGPU/TargetInfo/AMDGPUTargetInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/TargetInfo/AMDGPUTargetInfo.cpp
@@ -28,7 +28,7 @@
 }
 
 /// Extern function to initialize the targets for the AMDGPU backend
-extern "C" void LLVMInitializeAMDGPUTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTargetInfo() {
   RegisterTarget<Triple::r600, false> R600(getTheAMDGPUTarget(), "r600",
                                            "AMD GPUs HD2XXX-HD6XXX", "AMDGPU");
   RegisterTarget<Triple::amdgcn, false> GCN(getTheGCNTarget(), "amdgcn",
diff --git a/llvm/lib/Target/ARC/ARCAsmPrinter.cpp b/llvm/lib/Target/ARC/ARCAsmPrinter.cpp
--- a/llvm/lib/Target/ARC/ARCAsmPrinter.cpp
+++ b/llvm/lib/Target/ARC/ARCAsmPrinter.cpp
@@ -62,6 +62,6 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeARCAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCAsmPrinter() {
   RegisterAsmPrinter<ARCAsmPrinter> X(getTheARCTarget());
 }
diff --git a/llvm/lib/Target/ARC/ARCTargetMachine.cpp b/llvm/lib/Target/ARC/ARCTargetMachine.cpp
--- a/llvm/lib/Target/ARC/ARCTargetMachine.cpp
+++ b/llvm/lib/Target/ARC/ARCTargetMachine.cpp
@@ -81,7 +81,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeARCTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCTarget() {
   RegisterTargetMachine<ARCTargetMachine> X(getTheARCTarget());
 }
 
diff --git a/llvm/lib/Target/ARC/Disassembler/ARCDisassembler.cpp b/llvm/lib/Target/ARC/Disassembler/ARCDisassembler.cpp
--- a/llvm/lib/Target/ARC/Disassembler/ARCDisassembler.cpp
+++ b/llvm/lib/Target/ARC/Disassembler/ARCDisassembler.cpp
@@ -363,7 +363,7 @@
   return new ARCDisassembler(STI, Ctx, T.createMCInstrInfo());
 }
 
-extern "C" void LLVMInitializeARCDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCDisassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheARCTarget(),
                                          createARCDisassembler);
diff --git a/llvm/lib/Target/ARC/MCTargetDesc/ARCMCTargetDesc.cpp b/llvm/lib/Target/ARC/MCTargetDesc/ARCMCTargetDesc.cpp
--- a/llvm/lib/Target/ARC/MCTargetDesc/ARCMCTargetDesc.cpp
+++ b/llvm/lib/Target/ARC/MCTargetDesc/ARCMCTargetDesc.cpp
@@ -82,7 +82,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeARCTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCTargetMC() {
   // Register the MC asm info.
   Target &TheARCTarget = getTheARCTarget();
   RegisterMCAsmInfoFn X(TheARCTarget, createARCMCAsmInfo);
diff --git a/llvm/lib/Target/ARC/TargetInfo/ARCTargetInfo.cpp b/llvm/lib/Target/ARC/TargetInfo/ARCTargetInfo.cpp
--- a/llvm/lib/Target/ARC/TargetInfo/ARCTargetInfo.cpp
+++ b/llvm/lib/Target/ARC/TargetInfo/ARCTargetInfo.cpp
@@ -16,6 +16,6 @@
   return TheARCTarget;
 }
 
-extern "C" void LLVMInitializeARCTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCTargetInfo() {
   RegisterTarget<Triple::arc> X(getTheARCTarget(), "arc", "ARC", "ARC");
 }
diff --git a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
--- a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -2148,7 +2148,7 @@
 //===----------------------------------------------------------------------===//
 
 // Force static initialization.
-extern "C" void LLVMInitializeARMAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMAsmPrinter() {
   RegisterAsmPrinter<ARMAsmPrinter> X(getTheARMLETarget());
   RegisterAsmPrinter<ARMAsmPrinter> Y(getTheARMBETarget());
   RegisterAsmPrinter<ARMAsmPrinter> A(getTheThumbLETarget());
diff --git a/llvm/lib/Target/ARM/ARMTargetMachine.cpp b/llvm/lib/Target/ARM/ARMTargetMachine.cpp
--- a/llvm/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetMachine.cpp
@@ -79,7 +79,7 @@
   void initializeARMExecutionDomainFixPass(PassRegistry&);
 }
 
-extern "C" void LLVMInitializeARMTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMTarget() {
   // Register the target.
   RegisterTargetMachine<ARMLETargetMachine> X(getTheARMLETarget());
   RegisterTargetMachine<ARMLETargetMachine> A(getTheThumbLETarget());
diff --git a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
--- a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -11546,7 +11546,7 @@
 }
 
 /// Force static initialization.
-extern "C" void LLVMInitializeARMAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMAsmParser() {
   RegisterMCAsmParser<ARMAsmParser> X(getTheARMLETarget());
   RegisterMCAsmParser<ARMAsmParser> Y(getTheARMBETarget());
   RegisterMCAsmParser<ARMAsmParser> A(getTheThumbLETarget());
diff --git a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
--- a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -1099,7 +1099,7 @@
   return MCDisassembler::Fail;
 }
 
-extern "C" void LLVMInitializeARMDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMDisassembler() {
   TargetRegistry::RegisterMCDisassembler(getTheARMLETarget(),
                                          createARMDisassembler);
   TargetRegistry::RegisterMCDisassembler(getTheARMBETarget(),
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
@@ -317,7 +317,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeARMTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMTargetMC() {
   for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget(),
                     &getTheThumbLETarget(), &getTheThumbBETarget()}) {
     // Register the MC asm info.
diff --git a/llvm/lib/Target/ARM/TargetInfo/ARMTargetInfo.cpp b/llvm/lib/Target/ARM/TargetInfo/ARMTargetInfo.cpp
--- a/llvm/lib/Target/ARM/TargetInfo/ARMTargetInfo.cpp
+++ b/llvm/lib/Target/ARM/TargetInfo/ARMTargetInfo.cpp
@@ -27,7 +27,7 @@
   return TheThumbBETarget;
 }
 
-extern "C" void LLVMInitializeARMTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARMTargetInfo() {
   RegisterTarget<Triple::arm, /*HasJIT=*/true> X(getTheARMLETarget(), "arm",
                                                  "ARM", "ARM");
   RegisterTarget<Triple::armeb, /*HasJIT=*/true> Y(getTheARMBETarget(), "armeb",
diff --git a/llvm/lib/Target/AVR/AVRAsmPrinter.cpp b/llvm/lib/Target/AVR/AVRAsmPrinter.cpp
--- a/llvm/lib/Target/AVR/AVRAsmPrinter.cpp
+++ b/llvm/lib/Target/AVR/AVRAsmPrinter.cpp
@@ -178,7 +178,7 @@
 
 } // end of namespace llvm
 
-extern "C" void LLVMInitializeAVRAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRAsmPrinter() {
   llvm::RegisterAsmPrinter<llvm::AVRAsmPrinter> X(llvm::getTheAVRTarget());
 }
 
diff --git a/llvm/lib/Target/AVR/AVRTargetMachine.cpp b/llvm/lib/Target/AVR/AVRTargetMachine.cpp
--- a/llvm/lib/Target/AVR/AVRTargetMachine.cpp
+++ b/llvm/lib/Target/AVR/AVRTargetMachine.cpp
@@ -76,7 +76,7 @@
   return new AVRPassConfig(*this, PM);
 }
 
-extern "C" void LLVMInitializeAVRTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRTarget() {
   // Register the target.
   RegisterTargetMachine<AVRTargetMachine> X(getTheAVRTarget());
 
diff --git a/llvm/lib/Target/AVR/AsmParser/AVRAsmParser.cpp b/llvm/lib/Target/AVR/AsmParser/AVRAsmParser.cpp
--- a/llvm/lib/Target/AVR/AsmParser/AVRAsmParser.cpp
+++ b/llvm/lib/Target/AVR/AsmParser/AVRAsmParser.cpp
@@ -682,7 +682,7 @@
   return (parseMany(parseOne));
 }
 
-extern "C" void LLVMInitializeAVRAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRAsmParser() {
   RegisterMCAsmParser<AVRAsmParser> X(getTheAVRTarget());
 }
 
diff --git a/llvm/lib/Target/AVR/Disassembler/AVRDisassembler.cpp b/llvm/lib/Target/AVR/Disassembler/AVRDisassembler.cpp
--- a/llvm/lib/Target/AVR/Disassembler/AVRDisassembler.cpp
+++ b/llvm/lib/Target/AVR/Disassembler/AVRDisassembler.cpp
@@ -51,7 +51,7 @@
 }
 
 
-extern "C" void LLVMInitializeAVRDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRDisassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheAVRTarget(),
                                          createAVRDisassembler);
diff --git a/llvm/lib/Target/AVR/MCTargetDesc/AVRMCTargetDesc.cpp b/llvm/lib/Target/AVR/MCTargetDesc/AVRMCTargetDesc.cpp
--- a/llvm/lib/Target/AVR/MCTargetDesc/AVRMCTargetDesc.cpp
+++ b/llvm/lib/Target/AVR/MCTargetDesc/AVRMCTargetDesc.cpp
@@ -89,7 +89,7 @@
   return new AVRTargetAsmStreamer(S);
 }
 
-extern "C" void LLVMInitializeAVRTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRTargetMC() {
   // Register the MC asm info.
   RegisterMCAsmInfo<AVRMCAsmInfo> X(getTheAVRTarget());
 
diff --git a/llvm/lib/Target/AVR/TargetInfo/AVRTargetInfo.cpp b/llvm/lib/Target/AVR/TargetInfo/AVRTargetInfo.cpp
--- a/llvm/lib/Target/AVR/TargetInfo/AVRTargetInfo.cpp
+++ b/llvm/lib/Target/AVR/TargetInfo/AVRTargetInfo.cpp
@@ -15,7 +15,7 @@
 }
 }
 
-extern "C" void LLVMInitializeAVRTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRTargetInfo() {
   llvm::RegisterTarget<llvm::Triple::avr> X(llvm::getTheAVRTarget(), "avr",
                                             "Atmel AVR Microcontroller", "AVR");
 }
diff --git a/llvm/lib/Target/BPF/AsmParser/BPFAsmParser.cpp b/llvm/lib/Target/BPF/AsmParser/BPFAsmParser.cpp
--- a/llvm/lib/Target/BPF/AsmParser/BPFAsmParser.cpp
+++ b/llvm/lib/Target/BPF/AsmParser/BPFAsmParser.cpp
@@ -493,7 +493,7 @@
 
 bool BPFAsmParser::ParseDirective(AsmToken DirectiveID) { return true; }
 
-extern "C" void LLVMInitializeBPFAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFAsmParser() {
   RegisterMCAsmParser<BPFAsmParser> X(getTheBPFTarget());
   RegisterMCAsmParser<BPFAsmParser> Y(getTheBPFleTarget());
   RegisterMCAsmParser<BPFAsmParser> Z(getTheBPFbeTarget());
diff --git a/llvm/lib/Target/BPF/BPFAsmPrinter.cpp b/llvm/lib/Target/BPF/BPFAsmPrinter.cpp
--- a/llvm/lib/Target/BPF/BPFAsmPrinter.cpp
+++ b/llvm/lib/Target/BPF/BPFAsmPrinter.cpp
@@ -148,7 +148,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeBPFAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFAsmPrinter() {
   RegisterAsmPrinter<BPFAsmPrinter> X(getTheBPFleTarget());
   RegisterAsmPrinter<BPFAsmPrinter> Y(getTheBPFbeTarget());
   RegisterAsmPrinter<BPFAsmPrinter> Z(getTheBPFTarget());
diff --git a/llvm/lib/Target/BPF/BPFTargetMachine.cpp b/llvm/lib/Target/BPF/BPFTargetMachine.cpp
--- a/llvm/lib/Target/BPF/BPFTargetMachine.cpp
+++ b/llvm/lib/Target/BPF/BPFTargetMachine.cpp
@@ -27,7 +27,7 @@
 opt<bool> DisableMIPeephole("disable-bpf-peephole", cl::Hidden,
                             cl::desc("Disable machine peepholes for BPF"));
 
-extern "C" void LLVMInitializeBPFTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFTarget() {
   // Register the target.
   RegisterTargetMachine<BPFTargetMachine> X(getTheBPFleTarget());
   RegisterTargetMachine<BPFTargetMachine> Y(getTheBPFbeTarget());
diff --git a/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp b/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp
--- a/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp
+++ b/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp
@@ -83,7 +83,7 @@
 }
 
 
-extern "C" void LLVMInitializeBPFDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFDisassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheBPFTarget(),
                                          createBPFDisassembler);
diff --git a/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.cpp b/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.cpp
--- a/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.cpp
+++ b/llvm/lib/Target/BPF/MCTargetDesc/BPFMCTargetDesc.cpp
@@ -97,7 +97,7 @@
   return new BPFMCInstrAnalysis(Info);
 }
 
-extern "C" void LLVMInitializeBPFTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFTargetMC() {
   for (Target *T :
        {&getTheBPFleTarget(), &getTheBPFbeTarget(), &getTheBPFTarget()}) {
     // Register the MC asm info.
diff --git a/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp b/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp
--- a/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp
+++ b/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp
@@ -24,7 +24,7 @@
   return TheBPFTarget;
 }
 
-extern "C" void LLVMInitializeBPFTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFTargetInfo() {
   TargetRegistry::RegisterTarget(getTheBPFTarget(), "bpf", "BPF (host endian)",
                                  "BPF", [](Triple::ArchType) { return false; },
                                  true);
diff --git a/llvm/lib/Target/CMakeLists.txt b/llvm/lib/Target/CMakeLists.txt
--- a/llvm/lib/Target/CMakeLists.txt
+++ b/llvm/lib/Target/CMakeLists.txt
@@ -13,6 +13,14 @@
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Target
   )
 
+# When building shared objects for each target there are some internal APIs
+# that are used across shared objects which we can't hide.
+if (NOT BUILD_SHARED_LIBS AND NOT APPLE)
+  # Set default visibility to hidden, so we don't export all the Target classes
+  # in libLLVM.so.
+  set(CMAKE_CXX_VISIBILITY_PRESET hidden)
+endif()
+
 foreach(t ${LLVM_TARGETS_TO_BUILD})
   message(STATUS "Targeting ${t}")
   add_subdirectory(${t})
diff --git a/llvm/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp b/llvm/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp
--- a/llvm/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp
+++ b/llvm/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp
@@ -813,10 +813,10 @@
   return true;
 }
 
-// extern "C" void LLVMInitializeHexagonAsmLexer();
+// extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeHexagonAsmLexer();
 
 /// Force static initialization.
-extern "C" void LLVMInitializeHexagonAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeHexagonAsmParser() {
   RegisterMCAsmParser<HexagonAsmParser> X(getTheHexagonTarget());
 }
 
diff --git a/llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp b/llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
--- a/llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
+++ b/llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
@@ -156,7 +156,7 @@
   return new HexagonDisassembler(STI, Ctx, T.createMCInstrInfo());
 }
 
-extern "C" void LLVMInitializeHexagonDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeHexagonDisassembler() {
   TargetRegistry::RegisterMCDisassembler(getTheHexagonTarget(),
                                          createHexagonDisassembler);
 }
diff --git a/llvm/lib/Target/Hexagon/HexagonAsmPrinter.cpp b/llvm/lib/Target/Hexagon/HexagonAsmPrinter.cpp
--- a/llvm/lib/Target/Hexagon/HexagonAsmPrinter.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonAsmPrinter.cpp
@@ -771,6 +771,6 @@
   OutStreamer->EmitInstruction(MCB, getSubtargetInfo());
 }
 
-extern "C" void LLVMInitializeHexagonAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeHexagonAsmPrinter() {
   RegisterAsmPrinter<HexagonAsmPrinter> X(getTheHexagonTarget());
 }
diff --git a/llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp b/llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp
--- a/llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp
@@ -180,7 +180,7 @@
   return *RM;
 }
 
-extern "C" void LLVMInitializeHexagonTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeHexagonTarget() {
   // Register the target.
   RegisterTargetMachine<HexagonTargetMachine> X(getTheHexagonTarget());
 
diff --git a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp
--- a/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp
+++ b/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp
@@ -456,7 +456,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeHexagonTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeHexagonTargetMC() {
   // Register the MC asm info.
   RegisterMCAsmInfoFn X(getTheHexagonTarget(), createHexagonMCAsmInfo);
 
diff --git a/llvm/lib/Target/Hexagon/TargetInfo/HexagonTargetInfo.cpp b/llvm/lib/Target/Hexagon/TargetInfo/HexagonTargetInfo.cpp
--- a/llvm/lib/Target/Hexagon/TargetInfo/HexagonTargetInfo.cpp
+++ b/llvm/lib/Target/Hexagon/TargetInfo/HexagonTargetInfo.cpp
@@ -15,7 +15,7 @@
   return TheHexagonTarget;
 }
 
-extern "C" void LLVMInitializeHexagonTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeHexagonTargetInfo() {
   RegisterTarget<Triple::hexagon, /*HasJIT=*/true> X(
       getTheHexagonTarget(), "hexagon", "Hexagon", "Hexagon");
 }
diff --git a/llvm/lib/Target/Lanai/AsmParser/LanaiAsmParser.cpp b/llvm/lib/Target/Lanai/AsmParser/LanaiAsmParser.cpp
--- a/llvm/lib/Target/Lanai/AsmParser/LanaiAsmParser.cpp
+++ b/llvm/lib/Target/Lanai/AsmParser/LanaiAsmParser.cpp
@@ -1224,6 +1224,6 @@
 #define GET_MATCHER_IMPLEMENTATION
 #include "LanaiGenAsmMatcher.inc"
 
-extern "C" void LLVMInitializeLanaiAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiAsmParser() {
   RegisterMCAsmParser<LanaiAsmParser> x(getTheLanaiTarget());
 }
diff --git a/llvm/lib/Target/Lanai/Disassembler/LanaiDisassembler.cpp b/llvm/lib/Target/Lanai/Disassembler/LanaiDisassembler.cpp
--- a/llvm/lib/Target/Lanai/Disassembler/LanaiDisassembler.cpp
+++ b/llvm/lib/Target/Lanai/Disassembler/LanaiDisassembler.cpp
@@ -36,7 +36,7 @@
   return new LanaiDisassembler(STI, Ctx);
 }
 
-extern "C" void LLVMInitializeLanaiDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiDisassembler() {
   // Register the disassembler
   TargetRegistry::RegisterMCDisassembler(getTheLanaiTarget(),
                                          createLanaiDisassembler);
diff --git a/llvm/lib/Target/Lanai/LanaiAsmPrinter.cpp b/llvm/lib/Target/Lanai/LanaiAsmPrinter.cpp
--- a/llvm/lib/Target/Lanai/LanaiAsmPrinter.cpp
+++ b/llvm/lib/Target/Lanai/LanaiAsmPrinter.cpp
@@ -237,6 +237,6 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeLanaiAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiAsmPrinter() {
   RegisterAsmPrinter<LanaiAsmPrinter> X(getTheLanaiTarget());
 }
diff --git a/llvm/lib/Target/Lanai/LanaiTargetMachine.cpp b/llvm/lib/Target/Lanai/LanaiTargetMachine.cpp
--- a/llvm/lib/Target/Lanai/LanaiTargetMachine.cpp
+++ b/llvm/lib/Target/Lanai/LanaiTargetMachine.cpp
@@ -30,7 +30,7 @@
 void initializeLanaiMemAluCombinerPass(PassRegistry &);
 } // namespace llvm
 
-extern "C" void LLVMInitializeLanaiTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiTarget() {
   // Register the target.
   RegisterTargetMachine<LanaiTargetMachine> registered_target(
       getTheLanaiTarget());
diff --git a/llvm/lib/Target/Lanai/MCTargetDesc/LanaiMCTargetDesc.cpp b/llvm/lib/Target/Lanai/MCTargetDesc/LanaiMCTargetDesc.cpp
--- a/llvm/lib/Target/Lanai/MCTargetDesc/LanaiMCTargetDesc.cpp
+++ b/llvm/lib/Target/Lanai/MCTargetDesc/LanaiMCTargetDesc.cpp
@@ -123,7 +123,7 @@
   return new LanaiMCInstrAnalysis(Info);
 }
 
-extern "C" void LLVMInitializeLanaiTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiTargetMC() {
   // Register the MC asm info.
   RegisterMCAsmInfo<LanaiMCAsmInfo> X(getTheLanaiTarget());
 
diff --git a/llvm/lib/Target/Lanai/TargetInfo/LanaiTargetInfo.cpp b/llvm/lib/Target/Lanai/TargetInfo/LanaiTargetInfo.cpp
--- a/llvm/lib/Target/Lanai/TargetInfo/LanaiTargetInfo.cpp
+++ b/llvm/lib/Target/Lanai/TargetInfo/LanaiTargetInfo.cpp
@@ -16,7 +16,7 @@
   return TheLanaiTarget;
 }
 
-extern "C" void LLVMInitializeLanaiTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiTargetInfo() {
   RegisterTarget<Triple::lanai> X(getTheLanaiTarget(), "lanai", "Lanai",
                                   "Lanai");
 }
diff --git a/llvm/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp b/llvm/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp
--- a/llvm/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp
+++ b/llvm/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp
@@ -529,7 +529,7 @@
   return (parseMany(parseOne));
 }
 
-extern "C" void LLVMInitializeMSP430AsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430AsmParser() {
   RegisterMCAsmParser<MSP430AsmParser> X(getTheMSP430Target());
 }
 
diff --git a/llvm/lib/Target/MSP430/Disassembler/MSP430Disassembler.cpp b/llvm/lib/Target/MSP430/Disassembler/MSP430Disassembler.cpp
--- a/llvm/lib/Target/MSP430/Disassembler/MSP430Disassembler.cpp
+++ b/llvm/lib/Target/MSP430/Disassembler/MSP430Disassembler.cpp
@@ -58,7 +58,7 @@
   return new MSP430Disassembler(STI, Ctx);
 }
 
-extern "C" void LLVMInitializeMSP430Disassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430Disassembler() {
   TargetRegistry::RegisterMCDisassembler(getTheMSP430Target(),
                                          createMSP430Disassembler);
 }
diff --git a/llvm/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp b/llvm/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
--- a/llvm/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
+++ b/llvm/lib/Target/MSP430/MCTargetDesc/MSP430MCTargetDesc.cpp
@@ -57,7 +57,7 @@
   return nullptr;
 }
 
-extern "C" void LLVMInitializeMSP430TargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430TargetMC() {
   Target &T = getTheMSP430Target();
 
   RegisterMCAsmInfo<MSP430MCAsmInfo> X(T);
diff --git a/llvm/lib/Target/MSP430/MSP430AsmPrinter.cpp b/llvm/lib/Target/MSP430/MSP430AsmPrinter.cpp
--- a/llvm/lib/Target/MSP430/MSP430AsmPrinter.cpp
+++ b/llvm/lib/Target/MSP430/MSP430AsmPrinter.cpp
@@ -185,6 +185,6 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeMSP430AsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430AsmPrinter() {
   RegisterAsmPrinter<MSP430AsmPrinter> X(getTheMSP430Target());
 }
diff --git a/llvm/lib/Target/MSP430/MSP430TargetMachine.cpp b/llvm/lib/Target/MSP430/MSP430TargetMachine.cpp
--- a/llvm/lib/Target/MSP430/MSP430TargetMachine.cpp
+++ b/llvm/lib/Target/MSP430/MSP430TargetMachine.cpp
@@ -21,7 +21,7 @@
 #include "llvm/Support/TargetRegistry.h"
 using namespace llvm;
 
-extern "C" void LLVMInitializeMSP430Target() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430Target() {
   // Register the target.
   RegisterTargetMachine<MSP430TargetMachine> X(getTheMSP430Target());
 }
diff --git a/llvm/lib/Target/MSP430/TargetInfo/MSP430TargetInfo.cpp b/llvm/lib/Target/MSP430/TargetInfo/MSP430TargetInfo.cpp
--- a/llvm/lib/Target/MSP430/TargetInfo/MSP430TargetInfo.cpp
+++ b/llvm/lib/Target/MSP430/TargetInfo/MSP430TargetInfo.cpp
@@ -15,7 +15,7 @@
   return TheMSP430Target;
 }
 
-extern "C" void LLVMInitializeMSP430TargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430TargetInfo() {
   RegisterTarget<Triple::msp430> X(getTheMSP430Target(), "msp430",
                                    "MSP430 [experimental]", "MSP430");
 }
diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -8645,7 +8645,7 @@
   return false;
 }
 
-extern "C" void LLVMInitializeMipsAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsAsmParser() {
   RegisterMCAsmParser<MipsAsmParser> X(getTheMipsTarget());
   RegisterMCAsmParser<MipsAsmParser> Y(getTheMipselTarget());
   RegisterMCAsmParser<MipsAsmParser> A(getTheMips64Target());
diff --git a/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp b/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
--- a/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
+++ b/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
@@ -563,7 +563,7 @@
   return new MipsDisassembler(STI, Ctx, false);
 }
 
-extern "C" void LLVMInitializeMipsDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsDisassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheMipsTarget(),
                                          createMipsDisassembler);
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
@@ -166,7 +166,7 @@
   return new MipsMCInstrAnalysis(Info);
 }
 
-extern "C" void LLVMInitializeMipsTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsTargetMC() {
   for (Target *T : {&getTheMipsTarget(), &getTheMipselTarget(),
                     &getTheMips64Target(), &getTheMips64elTarget()}) {
     // Register the MC asm info.
diff --git a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
--- a/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/llvm/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -1306,7 +1306,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeMipsAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsAsmPrinter() {
   RegisterAsmPrinter<MipsAsmPrinter> X(getTheMipsTarget());
   RegisterAsmPrinter<MipsAsmPrinter> Y(getTheMipselTarget());
   RegisterAsmPrinter<MipsAsmPrinter> A(getTheMips64Target());
diff --git a/llvm/lib/Target/Mips/MipsTargetMachine.cpp b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
--- a/llvm/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
@@ -45,7 +45,7 @@
 
 #define DEBUG_TYPE "mips"
 
-extern "C" void LLVMInitializeMipsTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsTarget() {
   // Register the target.
   RegisterTargetMachine<MipsebTargetMachine> X(getTheMipsTarget());
   RegisterTargetMachine<MipselTargetMachine> Y(getTheMipselTarget());
diff --git a/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp b/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp
--- a/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp
+++ b/llvm/lib/Target/Mips/TargetInfo/MipsTargetInfo.cpp
@@ -27,7 +27,7 @@
   return TheMips64elTarget;
 }
 
-extern "C" void LLVMInitializeMipsTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsTargetInfo() {
   RegisterTarget<Triple::mips,
                  /*HasJIT=*/true>
       X(getTheMipsTarget(), "mips", "MIPS (32-bit big endian)", "Mips");
diff --git a/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXMCTargetDesc.cpp b/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXMCTargetDesc.cpp
--- a/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXMCTargetDesc.cpp
+++ b/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXMCTargetDesc.cpp
@@ -66,7 +66,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeNVPTXTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeNVPTXTargetMC() {
   for (Target *T : {&getTheNVPTXTarget32(), &getTheNVPTXTarget64()}) {
     // Register the MC asm info.
     RegisterMCAsmInfo<NVPTXMCAsmInfo> X(*T);
diff --git a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
--- a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
@@ -2258,7 +2258,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeNVPTXAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeNVPTXAsmPrinter() {
   RegisterAsmPrinter<NVPTXAsmPrinter> X(getTheNVPTXTarget32());
   RegisterAsmPrinter<NVPTXAsmPrinter> Y(getTheNVPTXTarget64());
 }
diff --git a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
--- a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
@@ -72,7 +72,7 @@
 
 } // end namespace llvm
 
-extern "C" void LLVMInitializeNVPTXTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeNVPTXTarget() {
   // Register the target.
   RegisterTargetMachine<NVPTXTargetMachine32> X(getTheNVPTXTarget32());
   RegisterTargetMachine<NVPTXTargetMachine64> Y(getTheNVPTXTarget64());
diff --git a/llvm/lib/Target/NVPTX/TargetInfo/NVPTXTargetInfo.cpp b/llvm/lib/Target/NVPTX/TargetInfo/NVPTXTargetInfo.cpp
--- a/llvm/lib/Target/NVPTX/TargetInfo/NVPTXTargetInfo.cpp
+++ b/llvm/lib/Target/NVPTX/TargetInfo/NVPTXTargetInfo.cpp
@@ -19,7 +19,7 @@
   return TheNVPTXTarget64;
 }
 
-extern "C" void LLVMInitializeNVPTXTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeNVPTXTargetInfo() {
   RegisterTarget<Triple::nvptx> X(getTheNVPTXTarget32(), "nvptx",
                                   "NVIDIA PTX 32-bit", "NVPTX");
   RegisterTarget<Triple::nvptx64> Y(getTheNVPTXTarget64(), "nvptx64",
diff --git a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
--- a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
+++ b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
@@ -1786,7 +1786,7 @@
 
 
 /// Force static initialization.
-extern "C" void LLVMInitializePowerPCAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCAsmParser() {
   RegisterMCAsmParser<PPCAsmParser> A(getThePPC32Target());
   RegisterMCAsmParser<PPCAsmParser> B(getThePPC64Target());
   RegisterMCAsmParser<PPCAsmParser> C(getThePPC64LETarget());
diff --git a/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp b/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp
--- a/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp
+++ b/llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp
@@ -50,7 +50,7 @@
   return new PPCDisassembler(STI, Ctx, /*IsLittleEndian=*/true);
 }
 
-extern "C" void LLVMInitializePowerPCDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCDisassembler() {
   // Register the disassembler for each target.
   TargetRegistry::RegisterMCDisassembler(getThePPC32Target(),
                                          createPPCDisassembler);
diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
@@ -292,7 +292,7 @@
   return new PPCInstPrinter(MAI, MII, MRI, T);
 }
 
-extern "C" void LLVMInitializePowerPCTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCTargetMC() {
   for (Target *T :
        {&getThePPC32Target(), &getThePPC64Target(), &getThePPC64LETarget()}) {
     // Register the MC asm info.
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -1801,7 +1801,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializePowerPCAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCAsmPrinter() {
   TargetRegistry::RegisterAsmPrinter(getThePPC32Target(),
                                      createPPCAsmPrinterPass);
   TargetRegistry::RegisterAsmPrinter(getThePPC64Target(),
diff --git a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
--- a/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -94,7 +94,7 @@
   ReduceCRLogical("ppc-reduce-cr-logicals",
                   cl::desc("Expand eligible cr-logical binary ops to branches"),
                   cl::init(true), cl::Hidden);
-extern "C" void LLVMInitializePowerPCTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCTarget() {
   // Register the targets
   RegisterTargetMachine<PPCTargetMachine> A(getThePPC32Target());
   RegisterTargetMachine<PPCTargetMachine> B(getThePPC64Target());
diff --git a/llvm/lib/Target/PowerPC/TargetInfo/PowerPCTargetInfo.cpp b/llvm/lib/Target/PowerPC/TargetInfo/PowerPCTargetInfo.cpp
--- a/llvm/lib/Target/PowerPC/TargetInfo/PowerPCTargetInfo.cpp
+++ b/llvm/lib/Target/PowerPC/TargetInfo/PowerPCTargetInfo.cpp
@@ -23,7 +23,7 @@
   return ThePPC64LETarget;
 }
 
-extern "C" void LLVMInitializePowerPCTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCTargetInfo() {
   RegisterTarget<Triple::ppc, /*HasJIT=*/true> X(getThePPC32Target(), "ppc32",
                                                  "PowerPC 32", "PPC");
 
diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -1872,7 +1872,7 @@
   return false;
 }
 
-extern "C" void LLVMInitializeRISCVAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVAsmParser() {
   RegisterMCAsmParser<RISCVAsmParser> X(getTheRISCV32Target());
   RegisterMCAsmParser<RISCVAsmParser> Y(getTheRISCV64Target());
 }
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -48,7 +48,7 @@
   return new RISCVDisassembler(STI, Ctx);
 }
 
-extern "C" void LLVMInitializeRISCVDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVDisassembler() {
   // Register the disassembler for each target.
   TargetRegistry::RegisterMCDisassembler(getTheRISCV32Target(),
                                          createRISCVDisassembler);
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
@@ -93,7 +93,7 @@
   return new RISCVTargetAsmStreamer(S, OS);
 }
 
-extern "C" void LLVMInitializeRISCVTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVTargetMC() {
   for (Target *T : {&getTheRISCV32Target(), &getTheRISCV64Target()}) {
     TargetRegistry::RegisterMCAsmInfo(*T, createRISCVMCAsmInfo);
     TargetRegistry::RegisterMCInstrInfo(*T, createRISCVMCInstrInfo);
diff --git a/llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp b/llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp
--- a/llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp
+++ b/llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp
@@ -155,7 +155,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeRISCVAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVAsmPrinter() {
   RegisterAsmPrinter<RISCVAsmPrinter> X(getTheRISCV32Target());
   RegisterAsmPrinter<RISCVAsmPrinter> Y(getTheRISCV64Target());
 }
diff --git a/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp b/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
--- a/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
+++ b/llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
@@ -31,7 +31,7 @@
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;
 
-extern "C" void LLVMInitializeRISCVTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVTarget() {
   RegisterTargetMachine<RISCVTargetMachine> X(getTheRISCV32Target());
   RegisterTargetMachine<RISCVTargetMachine> Y(getTheRISCV64Target());
   auto PR = PassRegistry::getPassRegistry();
diff --git a/llvm/lib/Target/RISCV/TargetInfo/RISCVTargetInfo.cpp b/llvm/lib/Target/RISCV/TargetInfo/RISCVTargetInfo.cpp
--- a/llvm/lib/Target/RISCV/TargetInfo/RISCVTargetInfo.cpp
+++ b/llvm/lib/Target/RISCV/TargetInfo/RISCVTargetInfo.cpp
@@ -20,7 +20,7 @@
   return TheRISCV64Target;
 }
 
-extern "C" void LLVMInitializeRISCVTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVTargetInfo() {
   RegisterTarget<Triple::riscv32> X(getTheRISCV32Target(), "riscv32",
                                     "32-bit RISC-V", "RISCV");
   RegisterTarget<Triple::riscv64> Y(getTheRISCV64Target(), "riscv64",
diff --git a/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp b/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
--- a/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
+++ b/llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
@@ -1308,7 +1308,7 @@
   return true;
 }
 
-extern "C" void LLVMInitializeSparcAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSparcAsmParser() {
   RegisterMCAsmParser<SparcAsmParser> A(getTheSparcTarget());
   RegisterMCAsmParser<SparcAsmParser> B(getTheSparcV9Target());
   RegisterMCAsmParser<SparcAsmParser> C(getTheSparcelTarget());
diff --git a/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp b/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp
--- a/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp
+++ b/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp
@@ -47,7 +47,7 @@
 }
 
 
-extern "C" void LLVMInitializeSparcDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSparcDisassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheSparcTarget(),
                                          createSparcDisassembler);
diff --git a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp
--- a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp
@@ -91,7 +91,7 @@
   return new SparcInstPrinter(MAI, MII, MRI);
 }
 
-extern "C" void LLVMInitializeSparcTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSparcTargetMC() {
   // Register the MC asm info.
   RegisterMCAsmInfoFn X(getTheSparcTarget(), createSparcMCAsmInfo);
   RegisterMCAsmInfoFn Y(getTheSparcV9Target(), createSparcV9MCAsmInfo);
diff --git a/llvm/lib/Target/Sparc/SparcAsmPrinter.cpp b/llvm/lib/Target/Sparc/SparcAsmPrinter.cpp
--- a/llvm/lib/Target/Sparc/SparcAsmPrinter.cpp
+++ b/llvm/lib/Target/Sparc/SparcAsmPrinter.cpp
@@ -439,7 +439,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeSparcAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSparcAsmPrinter() {
   RegisterAsmPrinter<SparcAsmPrinter> X(getTheSparcTarget());
   RegisterAsmPrinter<SparcAsmPrinter> Y(getTheSparcV9Target());
   RegisterAsmPrinter<SparcAsmPrinter> Z(getTheSparcelTarget());
diff --git a/llvm/lib/Target/Sparc/SparcTargetMachine.cpp b/llvm/lib/Target/Sparc/SparcTargetMachine.cpp
--- a/llvm/lib/Target/Sparc/SparcTargetMachine.cpp
+++ b/llvm/lib/Target/Sparc/SparcTargetMachine.cpp
@@ -20,7 +20,7 @@
 #include "llvm/Support/TargetRegistry.h"
 using namespace llvm;
 
-extern "C" void LLVMInitializeSparcTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSparcTarget() {
   // Register the target.
   RegisterTargetMachine<SparcV8TargetMachine> X(getTheSparcTarget());
   RegisterTargetMachine<SparcV9TargetMachine> Y(getTheSparcV9Target());
diff --git a/llvm/lib/Target/Sparc/TargetInfo/SparcTargetInfo.cpp b/llvm/lib/Target/Sparc/TargetInfo/SparcTargetInfo.cpp
--- a/llvm/lib/Target/Sparc/TargetInfo/SparcTargetInfo.cpp
+++ b/llvm/lib/Target/Sparc/TargetInfo/SparcTargetInfo.cpp
@@ -23,7 +23,7 @@
   return TheSparcelTarget;
 }
 
-extern "C" void LLVMInitializeSparcTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSparcTargetInfo() {
   RegisterTarget<Triple::sparc, /*HasJIT=*/true> X(getTheSparcTarget(), "sparc",
                                                    "Sparc", "Sparc");
   RegisterTarget<Triple::sparcv9, /*HasJIT=*/true> Y(
diff --git a/llvm/lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp b/llvm/lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp
--- a/llvm/lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp
+++ b/llvm/lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp
@@ -1389,6 +1389,6 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeSystemZAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZAsmParser() {
   RegisterMCAsmParser<SystemZAsmParser> X(getTheSystemZTarget());
 }
diff --git a/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp b/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
--- a/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
+++ b/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
@@ -45,7 +45,7 @@
   return new SystemZDisassembler(STI, Ctx);
 }
 
-extern "C" void LLVMInitializeSystemZDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZDisassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheSystemZTarget(),
                                          createSystemZDisassembler);
diff --git a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp
--- a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp
+++ b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp
@@ -183,7 +183,7 @@
   return new SystemZInstPrinter(MAI, MII, MRI);
 }
 
-extern "C" void LLVMInitializeSystemZTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZTargetMC() {
   // Register the MCAsmInfo.
   TargetRegistry::RegisterMCAsmInfo(getTheSystemZTarget(),
                                     createSystemZMCAsmInfo);
diff --git a/llvm/lib/Target/SystemZ/SystemZAsmPrinter.cpp b/llvm/lib/Target/SystemZ/SystemZAsmPrinter.cpp
--- a/llvm/lib/Target/SystemZ/SystemZAsmPrinter.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZAsmPrinter.cpp
@@ -724,6 +724,6 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeSystemZAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZAsmPrinter() {
   RegisterAsmPrinter<SystemZAsmPrinter> X(getTheSystemZTarget());
 }
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
--- a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
@@ -29,7 +29,7 @@
 
 using namespace llvm;
 
-extern "C" void LLVMInitializeSystemZTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZTarget() {
   // Register the target.
   RegisterTargetMachine<SystemZTargetMachine> X(getTheSystemZTarget());
 }
diff --git a/llvm/lib/Target/SystemZ/TargetInfo/SystemZTargetInfo.cpp b/llvm/lib/Target/SystemZ/TargetInfo/SystemZTargetInfo.cpp
--- a/llvm/lib/Target/SystemZ/TargetInfo/SystemZTargetInfo.cpp
+++ b/llvm/lib/Target/SystemZ/TargetInfo/SystemZTargetInfo.cpp
@@ -16,7 +16,7 @@
   return TheSystemZTarget;
 }
 
-extern "C" void LLVMInitializeSystemZTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZTargetInfo() {
   RegisterTarget<Triple::systemz, /*HasJIT=*/true> X(
       getTheSystemZTarget(), "systemz", "SystemZ", "SystemZ");
 }
diff --git a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
--- a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
+++ b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
@@ -899,7 +899,7 @@
 } // end anonymous namespace
 
 // Force static initialization.
-extern "C" void LLVMInitializeWebAssemblyAsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyAsmParser() {
   RegisterMCAsmParser<WebAssemblyAsmParser> X(getTheWebAssemblyTarget32());
   RegisterMCAsmParser<WebAssemblyAsmParser> Y(getTheWebAssemblyTarget64());
 }
diff --git a/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp b/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
--- a/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
+++ b/llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
@@ -64,7 +64,8 @@
   return new WebAssemblyDisassembler(STI, Ctx, std::move(MCII));
 }
 
-extern "C" void LLVMInitializeWebAssemblyDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void
+LLVMInitializeWebAssemblyDisassembler() {
   // Register the disassembler for each target.
   TargetRegistry::RegisterMCDisassembler(getTheWebAssemblyTarget32(),
                                          createWebAssemblyDisassembler);
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
@@ -96,7 +96,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeWebAssemblyTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyTargetMC() {
   for (Target *T :
        {&getTheWebAssemblyTarget32(), &getTheWebAssemblyTarget64()}) {
     // Register the MC asm info.
diff --git a/llvm/lib/Target/WebAssembly/TargetInfo/WebAssemblyTargetInfo.cpp b/llvm/lib/Target/WebAssembly/TargetInfo/WebAssemblyTargetInfo.cpp
--- a/llvm/lib/Target/WebAssembly/TargetInfo/WebAssemblyTargetInfo.cpp
+++ b/llvm/lib/Target/WebAssembly/TargetInfo/WebAssemblyTargetInfo.cpp
@@ -26,7 +26,7 @@
   return TheWebAssemblyTarget64;
 }
 
-extern "C" void LLVMInitializeWebAssemblyTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyTargetInfo() {
   RegisterTarget<Triple::wasm32> X(getTheWebAssemblyTarget32(), "wasm32",
                                    "WebAssembly 32-bit", "WebAssembly");
   RegisterTarget<Triple::wasm64> Y(getTheWebAssemblyTarget64(), "wasm64",
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
--- a/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
@@ -425,7 +425,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeWebAssemblyAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyAsmPrinter() {
   RegisterAsmPrinter<WebAssemblyAsmPrinter> X(getTheWebAssemblyTarget32());
   RegisterAsmPrinter<WebAssemblyAsmPrinter> Y(getTheWebAssemblyTarget64());
 }
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
--- a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
@@ -45,7 +45,7 @@
     cl::desc("WebAssembly Emscripten-style setjmp/longjmp handling"),
     cl::init(false));
 
-extern "C" void LLVMInitializeWebAssemblyTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyTarget() {
   // Register the target.
   RegisterTargetMachine<WebAssemblyTargetMachine> X(
       getTheWebAssemblyTarget32());
diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -3939,7 +3939,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeX86AsmParser() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86AsmParser() {
   RegisterMCAsmParser<X86AsmParser> X(getTheX86_32Target());
   RegisterMCAsmParser<X86AsmParser> Y(getTheX86_64Target());
 }
diff --git a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
--- a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
+++ b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
@@ -2332,7 +2332,7 @@
   return new X86GenericDisassembler(STI, Ctx, std::move(MII));
 }
 
-extern "C" void LLVMInitializeX86Disassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86Disassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheX86_32Target(),
                                          createX86Disassembler);
diff --git a/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp b/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
--- a/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
+++ b/llvm/lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
@@ -552,7 +552,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeX86TargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86TargetMC() {
   for (Target *T : {&getTheX86_32Target(), &getTheX86_64Target()}) {
     // Register the MC asm info.
     RegisterMCAsmInfoFn X(*T, createX86MCAsmInfo);
diff --git a/llvm/lib/Target/X86/TargetInfo/X86TargetInfo.cpp b/llvm/lib/Target/X86/TargetInfo/X86TargetInfo.cpp
--- a/llvm/lib/Target/X86/TargetInfo/X86TargetInfo.cpp
+++ b/llvm/lib/Target/X86/TargetInfo/X86TargetInfo.cpp
@@ -19,7 +19,7 @@
   return TheX86_64Target;
 }
 
-extern "C" void LLVMInitializeX86TargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86TargetInfo() {
   RegisterTarget<Triple::x86, /*HasJIT=*/true> X(
       getTheX86_32Target(), "x86", "32-bit X86: Pentium-Pro and above", "X86");
 
diff --git a/llvm/lib/Target/X86/X86AsmPrinter.cpp b/llvm/lib/Target/X86/X86AsmPrinter.cpp
--- a/llvm/lib/Target/X86/X86AsmPrinter.cpp
+++ b/llvm/lib/Target/X86/X86AsmPrinter.cpp
@@ -749,7 +749,7 @@
 //===----------------------------------------------------------------------===//
 
 // Force static initialization.
-extern "C" void LLVMInitializeX86AsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86AsmPrinter() {
   RegisterAsmPrinter<X86AsmPrinter> X(getTheX86_32Target());
   RegisterAsmPrinter<X86AsmPrinter> Y(getTheX86_64Target());
 }
diff --git a/llvm/lib/Target/X86/X86TargetMachine.cpp b/llvm/lib/Target/X86/X86TargetMachine.cpp
--- a/llvm/lib/Target/X86/X86TargetMachine.cpp
+++ b/llvm/lib/Target/X86/X86TargetMachine.cpp
@@ -61,7 +61,7 @@
                                         "folding pass"),
                                cl::init(false), cl::Hidden);
 
-extern "C" void LLVMInitializeX86Target() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86Target() {
   // Register the target.
   RegisterTargetMachine<X86TargetMachine> X(getTheX86_32Target());
   RegisterTargetMachine<X86TargetMachine> Y(getTheX86_64Target());
diff --git a/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp b/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
--- a/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
+++ b/llvm/lib/Target/XCore/Disassembler/XCoreDisassembler.cpp
@@ -774,7 +774,7 @@
   return new XCoreDisassembler(STI, Ctx);
 }
 
-extern "C" void LLVMInitializeXCoreDisassembler() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreDisassembler() {
   // Register the disassembler.
   TargetRegistry::RegisterMCDisassembler(getTheXCoreTarget(),
                                          createXCoreDisassembler);
diff --git a/llvm/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp b/llvm/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp
--- a/llvm/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp
+++ b/llvm/lib/Target/XCore/MCTargetDesc/XCoreMCTargetDesc.cpp
@@ -122,7 +122,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeXCoreTargetMC() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreTargetMC() {
   // Register the MC asm info.
   RegisterMCAsmInfoFn X(getTheXCoreTarget(), createXCoreMCAsmInfo);
 
diff --git a/llvm/lib/Target/XCore/TargetInfo/XCoreTargetInfo.cpp b/llvm/lib/Target/XCore/TargetInfo/XCoreTargetInfo.cpp
--- a/llvm/lib/Target/XCore/TargetInfo/XCoreTargetInfo.cpp
+++ b/llvm/lib/Target/XCore/TargetInfo/XCoreTargetInfo.cpp
@@ -15,7 +15,7 @@
   return TheXCoreTarget;
 }
 
-extern "C" void LLVMInitializeXCoreTargetInfo() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreTargetInfo() {
   RegisterTarget<Triple::xcore> X(getTheXCoreTarget(), "xcore", "XCore",
                                   "XCore");
 }
diff --git a/llvm/lib/Target/XCore/XCoreAsmPrinter.cpp b/llvm/lib/Target/XCore/XCoreAsmPrinter.cpp
--- a/llvm/lib/Target/XCore/XCoreAsmPrinter.cpp
+++ b/llvm/lib/Target/XCore/XCoreAsmPrinter.cpp
@@ -292,6 +292,6 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeXCoreAsmPrinter() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreAsmPrinter() {
   RegisterAsmPrinter<XCoreAsmPrinter> X(getTheXCoreTarget());
 }
diff --git a/llvm/lib/Target/XCore/XCoreTargetMachine.cpp b/llvm/lib/Target/XCore/XCoreTargetMachine.cpp
--- a/llvm/lib/Target/XCore/XCoreTargetMachine.cpp
+++ b/llvm/lib/Target/XCore/XCoreTargetMachine.cpp
@@ -105,7 +105,7 @@
 }
 
 // Force static initialization.
-extern "C" void LLVMInitializeXCoreTarget() {
+extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreTarget() {
   RegisterTargetMachine<XCoreTargetMachine> X(getTheXCoreTarget());
 }
 
diff --git a/llvm/unittests/CMakeLists.txt b/llvm/unittests/CMakeLists.txt
--- a/llvm/unittests/CMakeLists.txt
+++ b/llvm/unittests/CMakeLists.txt
@@ -8,6 +8,12 @@
   add_unittest_with_input_files(UnitTests ${test_dirname} ${ARGN})
 endfunction()
 
+# The target unittests may test APIs that aren't exported in libLLVM.so, so
+# we need to always link against the static libraries.
+function(add_llvm_target_unittest test_dir_name)
+  add_llvm_unittest(${test_dir_name} DISABLE_LLVM_LINK_LLVM_DYLIB ${ARGN})
+endfunction()
+
 add_subdirectory(ADT)
 add_subdirectory(Analysis)
 add_subdirectory(AsmParser)
diff --git a/llvm/unittests/Target/AArch64/CMakeLists.txt b/llvm/unittests/Target/AArch64/CMakeLists.txt
--- a/llvm/unittests/Target/AArch64/CMakeLists.txt
+++ b/llvm/unittests/Target/AArch64/CMakeLists.txt
@@ -17,7 +17,7 @@
   Target
   )
 
-add_llvm_unittest(AArch64Tests
+add_llvm_target_unittest(AArch64Tests
   InstSizes.cpp
   TestStackOffset.cpp
   )
diff --git a/llvm/unittests/Target/ARM/CMakeLists.txt b/llvm/unittests/Target/ARM/CMakeLists.txt
--- a/llvm/unittests/Target/ARM/CMakeLists.txt
+++ b/llvm/unittests/Target/ARM/CMakeLists.txt
@@ -15,6 +15,6 @@
   Target
 )
 
-add_llvm_unittest(ARMTests
+add_llvm_target_unittest(ARMTests
   MachineInstrTest.cpp
   )
diff --git a/llvm/unittests/Target/WebAssembly/CMakeLists.txt b/llvm/unittests/Target/WebAssembly/CMakeLists.txt
--- a/llvm/unittests/Target/WebAssembly/CMakeLists.txt
+++ b/llvm/unittests/Target/WebAssembly/CMakeLists.txt
@@ -13,6 +13,6 @@
   WebAssemblyInfo
   )
 
-add_llvm_unittest(WebAssemblyTests
+add_llvm_target_unittest(WebAssemblyTests
   WebAssemblyExceptionInfoTest.cpp
   )
diff --git a/llvm/unittests/tools/llvm-exegesis/AArch64/CMakeLists.txt b/llvm/unittests/tools/llvm-exegesis/AArch64/CMakeLists.txt
--- a/llvm/unittests/tools/llvm-exegesis/AArch64/CMakeLists.txt
+++ b/llvm/unittests/tools/llvm-exegesis/AArch64/CMakeLists.txt
@@ -13,7 +13,7 @@
   AArch64
   )
 
-add_llvm_unittest(LLVMExegesisAArch64Tests
+add_llvm_target_unittest(LLVMExegesisAArch64Tests
   TargetTest.cpp
   )
 target_link_libraries(LLVMExegesisAArch64Tests PRIVATE
diff --git a/llvm/unittests/tools/llvm-exegesis/ARM/CMakeLists.txt b/llvm/unittests/tools/llvm-exegesis/ARM/CMakeLists.txt
--- a/llvm/unittests/tools/llvm-exegesis/ARM/CMakeLists.txt
+++ b/llvm/unittests/tools/llvm-exegesis/ARM/CMakeLists.txt
@@ -13,7 +13,7 @@
   ARM
   )
 
-add_llvm_unittest(LLVMExegesisARMTests
+add_llvm_target_unittest(LLVMExegesisARMTests
   AssemblerTest.cpp
   )
 target_link_libraries(LLVMExegesisARMTests PRIVATE LLVMExegesis)
diff --git a/llvm/unittests/tools/llvm-exegesis/Mips/CMakeLists.txt b/llvm/unittests/tools/llvm-exegesis/Mips/CMakeLists.txt
--- a/llvm/unittests/tools/llvm-exegesis/Mips/CMakeLists.txt
+++ b/llvm/unittests/tools/llvm-exegesis/Mips/CMakeLists.txt
@@ -13,7 +13,7 @@
   Mips
   )
 
-add_llvm_unittest(LLVMExegesisMipsTests
+add_llvm_target_unittest(LLVMExegesisMipsTests
   BenchmarkResultTest.cpp
   SnippetGeneratorTest.cpp
   TargetTest.cpp
diff --git a/llvm/unittests/tools/llvm-exegesis/PowerPC/CMakeLists.txt b/llvm/unittests/tools/llvm-exegesis/PowerPC/CMakeLists.txt
--- a/llvm/unittests/tools/llvm-exegesis/PowerPC/CMakeLists.txt
+++ b/llvm/unittests/tools/llvm-exegesis/PowerPC/CMakeLists.txt
@@ -13,7 +13,7 @@
   PowerPC
   )
 
-add_llvm_unittest(LLVMExegesisPowerPCTests
+add_llvm_target_unittest(LLVMExegesisPowerPCTests
   AnalysisTest.cpp
   TargetTest.cpp
   )
diff --git a/llvm/unittests/tools/llvm-exegesis/X86/CMakeLists.txt b/llvm/unittests/tools/llvm-exegesis/X86/CMakeLists.txt
--- a/llvm/unittests/tools/llvm-exegesis/X86/CMakeLists.txt
+++ b/llvm/unittests/tools/llvm-exegesis/X86/CMakeLists.txt
@@ -13,7 +13,7 @@
   X86
   )
 
-add_llvm_unittest(LLVMExegesisX86Tests
+add_llvm_target_unittest(LLVMExegesisX86Tests
   AssemblerTest.cpp
   BenchmarkResultTest.cpp
   RegisterAliasingTest.cpp
diff --git a/llvm/utils/unittest/CMakeLists.txt b/llvm/utils/unittest/CMakeLists.txt
--- a/llvm/utils/unittest/CMakeLists.txt
+++ b/llvm/utils/unittest/CMakeLists.txt
@@ -71,3 +71,23 @@
 )
 
 add_subdirectory(UnitTestMain)
+
+# When LLVM_LINK_LLVM_DYLIB is enabled, libLLVM.so is added to the interface
+# link libraries for gtest and gtest_main.  This means that any target, like
+# unittests for example, that links against gtest will be forced to link
+# against libLLVM.so.  In some cases we may want to statically unittests if they
+# need access to symbols that are marked private in libLLVM.so.  The only
+# way we can make this work is to remove libLLVM.so from the list of interface
+# link libraries for gtest and then make gtest users responsible for explicitly
+# adding libLLVM.so to their targets link libraries if they need it.
+
+function (gtest_remove_dylib_from_link_interface target)
+  get_target_property(interface_libs ${target} INTERFACE_LINK_LIBRARIES)
+  if (interface_libs)
+    list(REMOVE_ITEM interface_libs LLVM)
+    set_target_properties(${target} PROPERTIES INTERFACE_LINK_LIBRARIES "${interface_libs}")
+  endif()
+endfunction()
+
+gtest_remove_dylib_from_link_interface(gtest)
+gtest_remove_dylib_from_link_interface(gtest_main)