From: Jason Merrill <jason@redhat.com>
Date: Mon, 5 Dec 2022 15:00:31 +0000 (-0500)
Subject: build: add -Wconditionally-supported to strict_warn [PR64867]
X-Git-Tag: basepoints/gcc-14~2412
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=263c22a95bc9a0d80c4873c0291b0f938cea7310;p=thirdparty%2Fgcc.git

build: add -Wconditionally-supported to strict_warn [PR64867]

The PR (which isn't resolved by this commit) pointed out to me that GCC
should build with -Wconditionally-supported to support bootstrapping with a
C++11 compiler that makes different choices.

	PR c++/64867

gcc/ChangeLog:

	* configure.ac (strict_warn): Add -Wconditionally-supported.
	* configure: Regenerate.
---

diff --git a/gcc/configure b/gcc/configure
index 61b3cedbe693..921aad607127 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -7215,7 +7215,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 strict_warn=
 save_CXXFLAGS="$CXXFLAGS"
-for real_option in -Wmissing-format-attribute -Woverloaded-virtual; do
+for real_option in -Wmissing-format-attribute -Wconditionally-supported -Woverloaded-virtual; do
   # Do the check with the no- prefix removed since gcc silently
   # accepts any -Wno-* option on purpose
   case $real_option in
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 5efbf11793cf..b91f54ce05bc 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -580,7 +580,7 @@ ACX_PROG_CC_WARNING_OPTS(
 	m4_quote(m4_do([-Wstrict-prototypes -Wmissing-prototypes ],
 		       [])), [c_loose_warn])
 ACX_PROG_CXX_WARNING_OPTS(
-	m4_quote(m4_do([-Wmissing-format-attribute ],
+	m4_quote(m4_do([-Wmissing-format-attribute ], [-Wconditionally-supported ],
 		       [-Woverloaded-virtual])), [strict_warn])
 ACX_PROG_CC_WARNING_OPTS(
 	m4_quote(m4_do([-Wold-style-definition -Wc++-compat])), [c_strict_warn])