[Driver] Change layout of per-target runtimes to resemble multiarch

[phosek]

Summary

This is a follow up to r361432, changing the layout of per-target
runtimes to more closely resemble multiarch. While before, we used
the following layout:

<resource_dir>/<target>/lib/libclang_rt.<runtime>.<extension>

Now we use the following layout:

<resource_dir>/lib/<target>/libclang_rt.<runtime>.<extension>

This also more closely resembles the existing "non-per-target" layout:

<resource_dir>/lib/<os>/libclang_rt.<runtime>-<arch>.<extension>

This change will enable further simplification of the driver logic
in follow up changes.

[mcgrathr]

lgtm

clang/lib/Driver/ToolChain.cpp

 }
 
 
 Optional<std::string> ToolChain::getRuntimePath() const {
   SmallString<128> P;
 
   // First try the triple passed to driver as --target=<triple>.
   P.assign(D.ResourceDir);
-  llvm::sys::path::append(P, D.getTargetTriple(), "lib");
+  llvm::sys::path::append(P, "lib", D.getTargetTriple());
   if (getVFS().exists(P))
     return llvm::Optional<std::string>(P.str());
 
   // Second try the normalized triple.
   P.assign(D.ResourceDir);
-  llvm::sys::path::append(P, Triple.str(), "lib");
+  llvm::sys::path::append(P, "lib", Triple.str());
   if (getVFS().exists(P))
     return llvm::Optional<std::string>(P.str());
 
   return None;
 }
 
 Optional<std::string> ToolChain::getCXXStdlibPath() const {
   SmallString<128> P;

clang/test/Driver/fuchsia.c

 // CHECK: "-pie"
 // CHECK: "--build-id"
 // CHECK: "--hash-style=gnu"
 // CHECK: "-dynamic-linker" "ld.so.1"
 // CHECK: Scrt1.o
 // CHECK-NOT: crti.o
 // CHECK-NOT: crtbegin.o
 // CHECK: "-L[[SYSROOT]]{{/|\\\\}}lib"
-// CHECK-X86_64: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
-// CHECK-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-X86_64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}libclang_rt.builtins.a"
 // CHECK: "-lc"
 // CHECK-NOT: crtend.o
 // CHECK-NOT: crtn.o
 
 // RUN: %clang %s -### --target=x86_64-fuchsia -rtlib=libgcc -fuse-ld=lld 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-RTLIB
 // CHECK-RTLIB: error: invalid runtime library name in argument '-rtlib=libgcc'
 

 // CHECK-RELOCATABLE-NOT: "-pie"
 // CHECK-RELOCATABLE-NOT: "--build-id"
 // CHECK-RELOCATABLE: "-r"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia -nodefaultlibs -fuse-ld=lld 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     | FileCheck %s -check-prefix=CHECK-NODEFAULTLIBS
 // CHECK-NODEFAULTLIBS: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
-// CHECK-NODEFAULTLIBS-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NODEFAULTLIBS-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.builtins.a"
 // CHECK-NODEFAULTLIBS-NOT: "-lc"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia -nostdlib -fuse-ld=lld 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     | FileCheck %s -check-prefix=CHECK-NOSTDLIB
 // CHECK-NOSTDLIB: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
-// CHECK-NOSTDLIB-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NOSTDLIB-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.builtins.a"
 // CHECK-NOSTDLIB-NOT: "-lc"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia -nolibc -fuse-ld=lld 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     | FileCheck %s -check-prefix=CHECK-NOLIBC
 // CHECK-NOLIBC: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
-// CHECK-NOLIBC: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NOLIBC: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.builtins.a"
 // CHECK-NOLIBC-NOT: "-lc"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=safe-stack 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-SAFESTACK
 // CHECK-SAFESTACK: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-SAFESTACK: "-fsanitize=safe-stack"
-// CHECK-SAFESTACK-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.safestack.a"
+// CHECK-SAFESTACK-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.safestack.a"
 // CHECK-SAFESTACK-NOT: "__safestack_init"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=address 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-ASAN-X86
 // CHECK-ASAN-X86: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-ASAN-X86: "-fsanitize=address"
 // CHECK-ASAN-X86: "-fsanitize-address-globals-dead-stripping"
 // CHECK-ASAN-X86: "-dynamic-linker" "asan/ld.so.1"
-// CHECK-ASAN-X86: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.asan.so"
-// CHECK-ASAN-X86: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.asan-preinit.a"
+// CHECK-ASAN-X86: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.asan.so"
+// CHECK-ASAN-X86: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.asan-preinit.a"
 
 // RUN: %clang %s -### --target=aarch64-fuchsia \
 // RUN:     -fsanitize=address 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-ASAN-AARCH64
 // CHECK-ASAN-AARCH64: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-ASAN-AARCH64: "-fsanitize=address"
 // CHECK-ASAN-AARCH64: "-fsanitize-address-globals-dead-stripping"
 // CHECK-ASAN-AARCH64: "-dynamic-linker" "asan/ld.so.1"
-// CHECK-ASAN-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.asan.so"
-// CHECK-ASAN-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.asan-preinit.a"
+// CHECK-ASAN-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}libclang_rt.asan.so"
+// CHECK-ASAN-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}libclang_rt.asan-preinit.a"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=address -fPIC -shared 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-ASAN-SHARED
 // CHECK-ASAN-SHARED: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-ASAN-SHARED: "-fsanitize=address"
 // CHECK-ASAN-SHARED: "-fsanitize-address-globals-dead-stripping"
-// CHECK-ASAN-SHARED: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.asan.so"
-// CHECK-ASAN-SHARED-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.asan-preinit.a"
+// CHECK-ASAN-SHARED: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.asan.so"
+// CHECK-ASAN-SHARED-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.asan-preinit.a"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=fuzzer 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-FUZZER-X86
 // CHECK-FUZZER-X86: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-FUZZER-X86: "-fsanitize=fuzzer,fuzzer-no-link,safe-stack"
-// CHECK-FUZZER-X86: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.fuzzer.a"
+// CHECK-FUZZER-X86: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.fuzzer.a"
 
 // RUN: %clang %s -### --target=aarch64-fuchsia \
 // RUN:     -fsanitize=fuzzer 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-FUZZER-AARCH64
 // CHECK-FUZZER-AARCH64: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-FUZZER-AARCH64: "-fsanitize=fuzzer,fuzzer-no-link,safe-stack"
-// CHECK-FUZZER-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.fuzzer.a"
+// CHECK-FUZZER-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}libclang_rt.fuzzer.a"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=scudo 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-X86
 // CHECK-SCUDO-X86: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-SCUDO-X86: "-fsanitize=safe-stack,scudo"
 // CHECK-SCUDO-X86: "-pie"
-// CHECK-SCUDO-X86: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.scudo.so"
+// CHECK-SCUDO-X86: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.scudo.so"
 
 // RUN: %clang %s -### --target=aarch64-fuchsia \
 // RUN:     -fsanitize=scudo 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-AARCH64
 // CHECK-SCUDO-AARCH64: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-SCUDO-AARCH64: "-fsanitize=safe-stack,scudo"
 // CHECK-SCUDO-AARCH64: "-pie"
-// CHECK-SCUDO-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.scudo.so"
+// CHECK-SCUDO-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}libclang_rt.scudo.so"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fsanitize=scudo -fPIC -shared 2>&1 \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-SHARED
 // CHECK-SCUDO-SHARED: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-SCUDO-SHARED: "-fsanitize=safe-stack,scudo"
-// CHECK-SCUDO-SHARED: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.scudo.so"
+// CHECK-SCUDO-SHARED: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.scudo.so"
 
 // RUN: %clang %s -### --target=x86_64-fuchsia \
 // RUN:     -fxray-instrument -fxray-modes=xray-basic \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-XRAY-X86
 // CHECK-XRAY-X86: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-XRAY-X86: "-fxray-instrument"
-// CHECK-XRAY-X86: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.xray.a"
-// CHECK-XRAY-X86: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.xray-basic.a"
+// CHECK-XRAY-X86: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.xray.a"
+// CHECK-XRAY-X86: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.xray-basic.a"
 
 // RUN: %clang %s -### --target=aarch64-fuchsia \
 // RUN:     -fxray-instrument -fxray-modes=xray-basic \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:     -fuse-ld=lld 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-XRAY-AARCH64
 // CHECK-XRAY-AARCH64: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-XRAY-AARCH64: "-fxray-instrument"
-// CHECK-XRAY-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.xray.a"
-// CHECK-XRAY-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.xray-basic.a"
+// CHECK-XRAY-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}libclang_rt.xray.a"
+// CHECK-XRAY-AARCH64: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}aarch64-fuchsia{{/|\\\\}}libclang_rt.xray-basic.a"
 
 // RUN: %clang %s -### --target=aarch64-fuchsia \
 // RUN:     -O3 -flto -mcpu=cortex-a53 2>&1 \
 // RUN:     -fuse-ld=lld \
 // RUN:     | FileCheck %s -check-prefix=CHECK-LTO
 // CHECK-LTO: "-plugin-opt=mcpu=cortex-a53"
 // CHECK-LTO: "-plugin-opt=O3"
 

clang/test/Driver/fuchsia.cpp

 // CHECK-NOT: crti.o
 // CHECK-NOT: crtbegin.o
 // CHECK: "-L[[SYSROOT]]{{/|\\\\}}lib"
 // CHECK: "--push-state"
 // CHECK: "--as-needed"
 // CHECK: "-lc++"
 // CHECK: "-lm"
 // CHECK: "--pop-state"
-// CHECK: "[[RESOURCE_DIR]]{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}lib{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}x86_64-fuchsia{{/|\\\\}}libclang_rt.builtins.a"
 // CHECK: "-lc"
 // CHECK-NOT: crtend.o
 // CHECK-NOT: crtn.o
 
 // RUN: %clangxx %s -### --target=x86_64-unknown-fuchsia -stdlib=libstdc++ \
 // RUN:     -fuse-ld=lld 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-STDLIB
 // CHECK-STDLIB: error: invalid library name in argument '-stdlib=libstdc++'

clang/test/Driver/linux-per-target-runtime-dir.c

 // CHECK-PER-TARGET-RUNTIME: "-internal-isystem" "[[SYSROOT]]/usr/local/include"
 // CHECK-PER-TARGET-RUNTIME: "--sysroot=[[SYSROOT]]"
 // CHECK-PER-TARGET-RUNTIME: "-L{{.*}}{{/|\\\\}}..{{/|\\\\}}lib{{/|\\\\}}x86_64-linux-gnu{{/|\\\\}}c++"
 
 // RUN: %clang -rtlib=compiler-rt -print-libgcc-file-name 2>&1 \
 // RUN:     --target=x86_64-linux-gnu \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-X8664 %s
-// CHECK-CLANGRT-X8664: x86_64-linux-gnu{{/|\\}}lib{{/|\\}}libclang_rt.builtins.a
+// CHECK-CLANGRT-X8664: lib{{/|\\}}x86_64-linux-gnu{{/|\\}}libclang_rt.builtins.a
 
 // RUN: %clang -rtlib=compiler-rt -print-file-name=libclang_rt.builtins.a 2>&1 \
 // RUN:     --target=x86_64-linux-gnu \
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:   | FileCheck --check-prefix=CHECK-FILE-NAME-X8664 %s
-// CHECK-FILE-NAME-X8664: x86_64-linux-gnu{{/|\\}}lib{{/|\\}}libclang_rt.builtins.a
+// CHECK-FILE-NAME-X8664: lib{{/|\\}}x86_64-linux-gnu{{/|\\}}libclang_rt.builtins.a

compiler-rt/cmake/Modules/CompilerRTUtils.cmake

else()
     set(target "${arch}${triple_suffix}")
   endif()
   set(${variable} ${target} PARENT_SCOPE)
 endfunction()
 
 function(get_compiler_rt_install_dir arch install_dir)
   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
     get_compiler_rt_target(${arch} target)
-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${target}/lib PARENT_SCOPE)
+    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/lib/${target} PARENT_SCOPE)
   else()
     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
   endif()
 endfunction()
 
 function(get_compiler_rt_output_dir arch output_dir)
   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
     get_compiler_rt_target(${arch} target)
-    set(${output_dir} ${COMPILER_RT_OUTPUT_DIR}/${target}/lib PARENT_SCOPE)
+    set(${output_dir} ${COMPILER_RT_OUTPUT_DIR}/lib/${target} PARENT_SCOPE)
   else()
     set(${output_dir} ${COMPILER_RT_LIBRARY_OUTPUT_DIR} PARENT_SCOPE)
   endif()
 endfunction()
 
 # compiler_rt_process_sources(
 #   <OUTPUT_VAR>
 #   <SOURCE_FILE> ...