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authorKamlesh Kumar <kamleshbhalui@gmail.com>2019-12-05 16:49:00 +0100
committerFlorian Weimer <fweimer@redhat.com>2019-12-05 16:50:00 +0100
commit953ceff17a4a15b10cfdd5edc3c8cae4884c8ec3 (patch)
treef42e201d4ccf6d44b249579387444ed11c1d4d99
parent066d80a7cdfa5ab7b2dd66cb51e8abeed60227e5 (diff)
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<string.h>: Define __CORRECT_ISO_CPP_STRING_H_PROTO for Clang [BZ #25232]
Without the asm redirects, strchr et al. are not const-correct.

libc++ has a wrapper header that works with and without
__CORRECT_ISO_CPP_STRING_H_PROTO (using a Clang extension).  But when
Clang is used with libstdc++ or just C headers, the overloaded functions
with the correct types are not declared.

This change does not impact current GCC (with libstdc++ or libc++).
-rw-r--r--string/string.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/string/string.h b/string/string.h
index 73c22a535a..faf997b972 100644
--- a/string/string.h
+++ b/string/string.h
@@ -33,7 +33,8 @@ __BEGIN_DECLS
 #include <stddef.h>
 
 /* Tell the caller that we provide correct C++ prototypes.  */
-#if defined __cplusplus && __GNUC_PREREQ (4, 4)
+#if defined __cplusplus && (__GNUC_PREREQ (4, 4) \
+			    || __glibc_clang_prereq (3, 5))
 # define __CORRECT_ISO_CPP_STRING_H_PROTO
 #endif