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https://lists.gnu.org/archive/html/libtool-patches/2022-12/msg00000.html
From eb8952bf6df858b144f2dc8b573782e25b527c01 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sat, 10 Dec 2022 02:00:22 +0000
Subject: [PATCH] Allow -Werror and -Werror=* through flag filtering
* build-aux/ltmain.in (func_mode_link): allow -Werror and -Werror=* through
flat filtering at link time.
This is needed for detecting likely-runtime problems with LTO using
e.g. -Werror=odr or -Werror=lto-type-mismatch.
Bug: https://bugs.gentoo.org/884767
Signed-off-by: Sam James <sam@gentoo.org>
[rebased on top of Debian ltmain.sh]
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
--- a/ltmain.sh
+++ b/ltmain.sh
@@ -7564,10 +7564,11 @@ func_mode_link ()
# -static-* direct GCC to link specific libraries statically
# -fcilkplus Cilk Plus language extension features for C/C++
# -Wa,* Pass flags directly to the assembler
+ # -Werror, -Werror=* Report (specified) warnings as errors
-64|-mips[0-9]|-r[0-9][0-9]*|-xarch=*|-xtarget=*|+DA*|+DD*|-q*|-m*| \
-t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*|--sysroot=*| \
-O*|-g*|-flto*|-fwhopr*|-fuse-linker-plugin|-fstack-protector*|-stdlib=*| \
- -specs=*|-fsanitize=*|-fuse-ld=*|-static-*|-fcilkplus|-Wa,*)
+ -specs=*|-fsanitize=*|-fuse-ld=*|-static-*|-fcilkplus|-Wa,*|-Werror|-Werror=*)
func_quote_arg pretty "$arg"
arg=$func_quote_arg_result
func_append compile_command " $arg"
--
2.43.0
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