From: H.J. Lu <hjl.tools@gmail.com>
Date: Thu, 9 Jan 2025 23:09:16 +0000 (+0800)
Subject: configure: Clear libc_cv_cc_wimplicit_fallthrough if not supported
X-Git-Tag: glibc-2.41~103
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=dad44389f2f96523080e3b105eee1b1ab8b19722;p=thirdparty%2Fglibc.git

configure: Clear libc_cv_cc_wimplicit_fallthrough if not supported

Clear libc_cv_cc_wimplicit_fallthrough if -Wimplicit-fallthrough isn't
supported.  Tested with GCC 6.4.1 on x86-64.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
---

diff --git a/configure b/configure
index b410ee4bd9..eb8abd0054 100755
--- a/configure
+++ b/configure
@@ -7888,7 +7888,7 @@ else case e in #(
 then :
   libc_cv_cc_wimplicit_fallthrough=-Wimplicit-fallthrough
 else case e in #(
-  e) libc_cv_cc_wimplicit_fallthrough=-Wimplicit-fallthrough ;;
+  e) libc_cv_cc_wimplicit_fallthrough= ;;
 esac
 fi ;;
 esac
diff --git a/configure.ac b/configure.ac
index 9af8d541e5..050bfa65e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1562,7 +1562,7 @@ LIBC_TRY_CC_AND_TEST_CC_OPTION([for -Wimplicit-fallthrough],
   [-Werror -Wimplicit-fallthrough],
   libc_cv_cc_wimplicit_fallthrough,
   [libc_cv_cc_wimplicit_fallthrough=-Wimplicit-fallthrough],
-  [libc_cv_cc_wimplicit_fallthrough=-Wimplicit-fallthrough],
+  [libc_cv_cc_wimplicit_fallthrough=],
   libc_cv_test_cc_wimplicit_fallthrough,
   [libc_cv_test_cc_wimplicit_fallthrough=-Wimplicit-fallthrough],
   [libc_cv_test_cc_wimplicit_fallthrough=])