[Fuchsia] Enable static libc++, libc++abi, libunwind

[phosek]

Summary

This is needed for building Fuchsia drivers.

[mcgrathr]

lgtm

cfe/trunk/cmake/caches/Fuchsia-stage2.cmake

foreach(target x86_64;aarch64)
   set(RUNTIMES_${target}-fuchsia_CMAKE_C_FLAGS ${FUCHSIA_${target}_C_FLAGS} CACHE PATH "")
   set(RUNTIMES_${target}-fuchsia_CMAKE_CXX_FLAGS ${FUCHSIA_${target}_CXX_FLAGS} CACHE PATH "")
   set(RUNTIMES_${target}-fuchsia_CMAKE_EXE_LINKER_FLAGS ${FUCHSIA_${target}_LINKER_FLAGS} CACHE PATH "")
   set(RUNTIMES_${target}-fuchsia_CMAKE_SHARED_LINKER_FLAGS ${FUCHSIA_${target}_LINKER_FLAGS} CACHE PATH "")
   set(RUNTIMES_${target}-fuchsia_CMAKE_MODULE_LINKER_FLAGS ${FUCHSIA_${target}_LINKER_FLAGS} CACHE PATH "")
   set(RUNTIMES_${target}-fuchsia_CMAKE_SYSROOT ${FUCHSIA_${target}_SYSROOT} CACHE PATH "")
   set(RUNTIMES_${target}-fuchsia_LLVM_ENABLE_ASSERTIONS ${FUCHSIA_RUNTIMES_ENABLE_ASSERTIONS} CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBUNWIND_USE_COMPILER_RT ON CACHE BOOL "")
-  set(RUNTIMES_${target}-fuchsia_LIBUNWIND_ENABLE_STATIC OFF CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBCXXABI_USE_COMPILER_RT ON CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBCXXABI_USE_LLVM_UNWINDER ON CACHE BOOL "")
-  set(RUNTIMES_${target}-fuchsia_LIBCXXABI_ENABLE_STATIC OFF CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
-  set(RUNTIMES_${target}-fuchsia_LIBCXX_ENABLE_STATIC OFF CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_SANITIZER_USE_COMPILER_RT ON CACHE BOOL "")
 
   set(RUNTIMES_${target}-fuchsia-asan_LLVM_USE_SANITIZER Address CACHE STRING "")
   set(RUNTIMES_${target}-fuchsia-asan_LLVM_RUNTIMES_PREFIX "${target}-fuchsia/" CACHE STRING "")
   set(RUNTIMES_${target}-fuchsia-asan_LLVM_RUNTIMES_LIBDIR_SUFFIX "/asan" CACHE STRING "")
   set(RUNTIMES_${target}-fuchsia-asan_LIBCXX_INSTALL_HEADERS OFF CACHE BOOL "")
 endforeach()
 

cfe/trunk/lib/Driver/ToolChains/Fuchsia.cpp

void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
 
   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
 
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
     if (Args.hasArg(options::OPT_static))
       CmdArgs.push_back("-Bdynamic");
 
     if (D.CCCIsCXX()) {
-      if (ToolChain.ShouldLinkCXXStdlib(Args))
+      if (ToolChain.ShouldLinkCXXStdlib(Args)) {
+        bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
+                                   !Args.hasArg(options::OPT_static);
+        if (OnlyLibstdcxxStatic)
+          CmdArgs.push_back("-Bstatic");
         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
+        if (OnlyLibstdcxxStatic)
+          CmdArgs.push_back("-Bdynamic");
+      }
       CmdArgs.push_back("-lm");
     }
 
     AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
 
     if (Args.hasArg(options::OPT_pthread) ||
         Args.hasArg(options::OPT_pthreads))
       CmdArgs.push_back("-lpthread");

cfe/trunk/test/Driver/fuchsia.cpp

 // CHECK-NOT: crtn.o
 
 // RUN: %clangxx %s -### --target=x86_64-unknown-fuchsia -stdlib=libstdc++ 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-STDLIB
 // CHECK-STDLIB: error: invalid library name in argument '-stdlib=libstdc++'
 
 // RUN: %clangxx %s -### --target=x86_64-unknown-fuchsia -static-libstdc++ 2>&1 \
 // RUN:     | FileCheck %s -check-prefix=CHECK-STATIC
-// CHECK-STATIC-NOT: "-Bstatic"
+// CHECK-STATIC: "-Bstatic"
 // CHECK-STATIC: "-lc++"
-// CHECK-STATIC-NOT: "-Bdynamic"
+// CHECK-STATIC: "-Bdynamic"
 // CHECK-STATIC: "-lm"
 // CHECK-STATIC: "-lc"