https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98733
--- Comment #1 from Timm Bäder <tbaeder at redhat dot com> ---
I looked into this problem again and I think a potential fix could be as easy
as...
commit b95eed1938403874be927d4c25b8bbf88ed686ce (HEAD -> master)
Author: Timm Bäder <tbae...@redhat.com>
Date: Mon May 10 09:33:26 2021 +0200
libiberty: Check for asprintf/snprintf macros
asprintf and snprintf might be defined as a macro, in which case the
declarations in libiberty.h should be omitted. This is in particular
true for compilers that do not support __va_arg_pack().
diff --git a/include/libiberty.h b/include/libiberty.h
index f4c0fe11d6f..51a5bf91219 100644
--- a/include/libiberty.h
+++ b/include/libiberty.h
@@ -648,7 +648,7 @@ extern void *bsearch_r (const void *, const void *,
int (*)(const void *, const void *, void *),
void *);
-#if defined(HAVE_DECL_ASPRINTF) && !HAVE_DECL_ASPRINTF
+#if defined(HAVE_DECL_ASPRINTF) && !HAVE_DECL_ASPRINTF && !defined(asprintf)
/* Like sprintf but provides a pointer to malloc'd storage, which must
be freed by the caller. */
@@ -672,7 +672,7 @@ extern int vasprintf (char **, const char *, va_list)
ATTRIBUTE_PRINTF(2,0);
extern char *xvasprintf (const char *, va_list) ATTRIBUTE_MALLOC
ATTRIBUTE_PRINTF(1,0);
-#if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
+#if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF && !defined(snprintf)
/* Like sprintf but prints at most N characters. */
extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
#endif
Does that seem like a sensible thing to do on the GCC side?
