General definition for weak functions

In this diff, I define a general macro for defining weak functions
with a default implementation: "SANITIZER_INTERFACE_WEAK_DEF()".
This way, we simplify the implementation for different platforms.

For example, we cannot define weak functions on Windows, but we can
use linker pragmas to create an alias to a default implementation.
All of these implementation details are hidden in the new macro.

Also, as I modify the name for exported weak symbols on Windows, I
needed to temporarily disable "dll_host" test for asan, which checks
the list of functions included in asan_win_dll_thunk.

Differential Revision: https://reviews.llvm.org/D28596

llvm-svn: 293419

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.cc b/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
index 9824a5198b5..63a73594e37 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
@@ -505,9 +505,9 @@ int __sanitizer_install_malloc_and_free_hooks(void (*malloc_hook)(const void *,
   return InstallMallocFreeHooks(malloc_hook, free_hook);
 }
 
-#if !SANITIZER_GO && !SANITIZER_SUPPORTS_WEAK_HOOKS
-SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
-void __sanitizer_print_memory_profile(int top_percent) {
+#if !SANITIZER_GO
+SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_print_memory_profile,
+                             int top_percent) {
   (void)top_percent;
 }
 #endif