Revert r200683.

-fno-function-sections is broken in Clang.

llvm-svn: 200684

compiler-rt/CMakeLists.txt

@@ -142,7 +142,6 @@ if (NOT MSVC)
     -fno-stack-protector
     -Wno-gnu  # Variadic macros with 0 arguments for ...
     -fvisibility=hidden
-    -fno-function-sections
     )
   if (NOT COMPILER_RT_DEBUG)
     list(APPEND SANITIZER_COMMON_CFLAGS -O3)

compiler-rt/lib/asan/lit_tests/TestCases/Linux/function-sections-are-bad.cc

@@ -1,39 +0,0 @@
-// Check that --gc-sections does not throw away (or localize) parts of sanitizer
-// interface.
-// RUN: %clang_asan -m64 %s -Wl,--gc-sections -o %t
-// RUN: %clang_asan -m64 %s -DBUILD_SO -fPIC -o %t-so.so -shared
-// RUN: %t 2>&1
-
-#ifndef BUILD_SO
-#include <assert.h>
-#include <dlfcn.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(int argc, char *argv[]) {
-  char path[4096];
-  snprintf(path, sizeof(path), "%s-so.so", argv[0]);
-
-  void *handle = dlopen(path, RTLD_LAZY);
-  if (!handle) fprintf(stderr, "%s\n", dlerror());
-  assert(handle != 0);
-
-  typedef void (*F)();
-  F f = (F)dlsym(handle, "call_rtl_from_dso");
-  printf("%s\n", dlerror());
-  assert(dlerror() == 0);
-  f();
-  
-  dlclose(handle);
-  return 0;
-}
-
-#else // BUILD_SO
-
-#include <sanitizer/msan_interface.h>
-extern "C" void call_rtl_from_dso() {
-  volatile int32_t x;
-  volatile int32_t y = __sanitizer_unaligned_load32((void *)&x);
-}
-
-#endif // BUILD_SO