From 49fc1414b52b31f6ad0408775d160ec0559c33bb Mon Sep 17 00:00:00 2001
From: "Erlend E. Aasland" <erlend@python.org>
Date: Fri, 12 Apr 2024 09:37:38 +0200
Subject: gh-117752: Autoconf: fix -fno-semantic-interposition check (#117789)

Force the compiler to issue an error if the flag is not supported.
---
 configure    | 14 +++++++-------
 configure.ac |  2 +-
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/configure b/configure
index 15a645a..f2e628c 100755
--- a/configure
+++ b/configure
@@ -8241,13 +8241,13 @@ if test "$Py_OPT" = 'true' ; then
     *gcc*)
       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts -fno-semantic-interposition" >&5
 printf %s "checking whether C compiler accepts -fno-semantic-interposition... " >&6; }
-if test ${ax_cv_check_cflags___fno_semantic_interposition+y}
+if test ${ax_cv_check_cflags__Werror__fno_semantic_interposition+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
 
   ax_check_save_flags=$CFLAGS
-  CFLAGS="$CFLAGS  -fno-semantic-interposition"
+  CFLAGS="$CFLAGS -Werror -fno-semantic-interposition"
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -8261,16 +8261,16 @@ main (void)
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"
 then :
-  ax_cv_check_cflags___fno_semantic_interposition=yes
+  ax_cv_check_cflags__Werror__fno_semantic_interposition=yes
 else $as_nop
-  ax_cv_check_cflags___fno_semantic_interposition=no
+  ax_cv_check_cflags__Werror__fno_semantic_interposition=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
   CFLAGS=$ax_check_save_flags
 fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fno_semantic_interposition" >&5
-printf "%s\n" "$ax_cv_check_cflags___fno_semantic_interposition" >&6; }
-if test "x$ax_cv_check_cflags___fno_semantic_interposition" = xyes
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags__Werror__fno_semantic_interposition" >&5
+printf "%s\n" "$ax_cv_check_cflags__Werror__fno_semantic_interposition" >&6; }
+if test "x$ax_cv_check_cflags__Werror__fno_semantic_interposition" = xyes
 then :
 
       CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
diff --git a/configure.ac b/configure.ac
index 359ac2b..bcb1169 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1799,7 +1799,7 @@ if test "$Py_OPT" = 'true' ; then
       AX_CHECK_COMPILE_FLAG([-fno-semantic-interposition],[
       CFLAGS_NODIST="$CFLAGS_NODIST -fno-semantic-interposition"
       LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
-      ])
+      ], [], [-Werror])
       ;;
   esac
 elif test "$ac_sys_system" = "Emscripten" -o "$ac_sys_system" = "WASI"; then
-- 
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