[committed] libstdc++: Make Asan detection work for Clang [PR103453]

[Jonathan Wakely]

Tested x86_64-linux, pushed to trunk.


Clang doesn't define __SANITIZE_ADDRESS__ so use its __has_feature check
to detect Asan instead.

libstdc++-v3/ChangeLog:

	PR libstdc++/103453
	* config/allocator/malloc_allocator_base.h
	(_GLIBCXX_SANITIZE_STD_ALLOCATOR): Define for Clang.
	* config/allocator/new_allocator_base.h
	(_GLIBCXX_SANITIZE_STD_ALLOCATOR): Likewise.
---
 libstdc++-v3/config/allocator/malloc_allocator_base.h | 10 ++++++++--
 libstdc++-v3/config/allocator/new_allocator_base.h    | 10 ++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/config/allocator/malloc_allocator_base.h b/libstdc++-v3/config/allocator/malloc_allocator_base.h
index d7b56e3c9ef..b798d3fd448 100644
--- a/libstdc++-v3/config/allocator/malloc_allocator_base.h
+++ b/libstdc++-v3/config/allocator/malloc_allocator_base.h
@@ -52,8 +52,14 @@ namespace std
 # define __allocator_base  __gnu_cxx::malloc_allocator
 #endif
 
-#if defined(__SANITIZE_ADDRESS__) && !defined(_GLIBCXX_SANITIZE_STD_ALLOCATOR)
-# define _GLIBCXX_SANITIZE_STD_ALLOCATOR 1
+#ifndef _GLIBCXX_SANITIZE_STD_ALLOCATOR
+# if defined(__SANITIZE_ADDRESS__)
+#  define _GLIBCXX_SANITIZE_STD_ALLOCATOR 1
+# elif defined __has_feature
+#  if __has_feature(address_sanitizer)
+#   define _GLIBCXX_SANITIZE_STD_ALLOCATOR 1
+#  endif
+# endif
 #endif
 
 #endif
diff --git a/libstdc++-v3/config/allocator/new_allocator_base.h b/libstdc++-v3/config/allocator/new_allocator_base.h
index 77ee8b73979..7c52fef63de 100644
--- a/libstdc++-v3/config/allocator/new_allocator_base.h
+++ b/libstdc++-v3/config/allocator/new_allocator_base.h
@@ -52,8 +52,14 @@ namespace std
 # define __allocator_base  __gnu_cxx::new_allocator
 #endif
 
-#if defined(__SANITIZE_ADDRESS__) && !defined(_GLIBCXX_SANITIZE_STD_ALLOCATOR)
-# define _GLIBCXX_SANITIZE_STD_ALLOCATOR 1
+#ifndef _GLIBCXX_SANITIZE_STD_ALLOCATOR
+# if defined(__SANITIZE_ADDRESS__)
+#  define _GLIBCXX_SANITIZE_STD_ALLOCATOR 1
+# elif defined __has_feature
+#  if __has_feature(address_sanitizer)
+#   define _GLIBCXX_SANITIZE_STD_ALLOCATOR 1
+#  endif
+# endif
 #endif
 
 #endif
-- 
2.31.1