* lib/careadlinkat.c (readlink_stk): When --enable-gcc-warnings is
not in effect, use "#warning" to let builders know more clearly
about GCC bug 93644, because the bug triggers even if no -W option
is given to GCC.
---
ChangeLog | 8 ++++++++
lib/careadlinkat.c | 7 ++++++-
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index 82508f05c..4abbcd385 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2020-11-14 Paul Eggert <egg...@cs.ucla.edu>
+
+ careadlinkat: warn better about GCC bug 93644
+ * lib/careadlinkat.c (readlink_stk): When --enable-gcc-warnings is
+ not in effect, use "#warning" to let builders know more clearly
+ about GCC bug 93644, because the bug triggers even if no -W option
+ is given to GCC.
+
2020-11-13 Jim Meyering <meyer...@fb.com>
hard-locale-tests: avoid a -Wstrict-prototypes warning
diff --git a/lib/careadlinkat.c b/lib/careadlinkat.c
index e43aa42d5..79cc3b3a0 100644
--- a/lib/careadlinkat.c
+++ b/lib/careadlinkat.c
@@ -51,8 +51,13 @@ enum { STACK_BUF_SIZE = 1024 };
to pacify GCC is known; even an explicit #pragma does not pacify GCC.
When the GCC bug is fixed this workaround should be limited to the
broken GCC versions. */
-#if (defined GCC_LINT || defined lint) && _GL_GNUC_PREREQ (10, 1)
+#if _GL_GNUC_PREREQ (10, 1)
+# if defined GCC_LINT || defined lint
__attribute__ ((__noinline__))
+# elif __OPTIMIZE__ && !__NO_INLINE__
+# warning "GCC might issue a bogus -Wreturn-local-addr warning here."
+# warning "See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93644>."
+# endif
#endif
static char *
readlink_stk (int fd, char const *filename,
--
2.27.0
