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authorRichard Smith <richard-llvm@metafoo.co.uk>2013-02-08 22:55:10 +0000
committerRichard Smith <richard-llvm@metafoo.co.uk>2013-02-08 22:55:10 +0000
commitd31bd24b40262ff97db47804472589a89a4bcfe4 (patch)
treefeeb11481fc0b6f1041b152f8c1791f10f173953 /autoconf
parent1c66a18f84f25387d919c18c3d7a68ba22e18d01 (diff)
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configure: when performing a compiler feature test for a -Wno-foo flag, attempt
to use -Wfoo instead of -Wno-foo. This works around a bug in some versions of gcc, where it will silently accept an unknown -Wno-foo option, but will generate an error for a compile which uses -Wno-foo if that compile also triggers any warnings. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174770 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'autoconf')
-rw-r--r--autoconf/m4/cxx_flag_check.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/autoconf/m4/cxx_flag_check.m4 b/autoconf/m4/cxx_flag_check.m4
index 62454b7..4b09744 100644
--- a/autoconf/m4/cxx_flag_check.m4
+++ b/autoconf/m4/cxx_flag_check.m4
@@ -1,2 +1,2 @@
AC_DEFUN([CXX_FLAG_CHECK],
- [AC_SUBST($1, `$CXX -Werror $2 -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`)])
+ [AC_SUBST($1, `$CXX -Werror patsubst($2, [^-Wno-], [-W]) -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`)])