tree 7a47529c61af98fb87e494dc9812b7ad3198eb2b
parent 302f742819ecd2376cea8dd17cb8c5b7850531d3
author mjw <mjw@a5019735-40e9-0310-863c-91ae7b9d1cf9> 1408551113 +0000
committer mjw <mjw@a5019735-40e9-0310-863c-91ae7b9d1cf9> 1408551113 +0000

configure should check for warning flags supported to disable them (#338205).

Configure would check whether gcc supported -Wno... flags. But gcc always
does. It is happy to just not warn about anything. So flip all configure
checks to test for the warning and only when gcc accepts the warning flag
use -Wno-...

Introduces two helper functions to make it easier to add new flag checks.
AC_GCC_WARNING_COND and AC_GCC_WARNING_SUBST_NO.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14319 a5019735-40e9-0310-863c-91ae7b9d1cf9