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configure: Better prune unknwon gcc -Wno- flags.

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This commit is contained in:
Wilson Snyder 2016-11-18 19:27:29 -05:00
parent 183cabc77d
commit 9e38ed9a39
1 changed files with 12 additions and 0 deletions
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12
configure.ac
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@ -120,6 +120,18 @@ AC_DEFUN([_MY_CXX_CHECK_OPT],
fi
fi],
[_my_result=no])
# GCC is annoying, trying to be helpful, it postpones unknown -Wno-
# options if there's no error We want to see them regardless, so try
# forcing an error and see if we get a gcc warning
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[an_error "intentional-error-for-test.h"
]],[])],
[], # Ignore ok exit
[if test -s conftest.err; then
if grep -e "$2" conftest.err >/dev/null; then
_my_result=no
fi
fi])
AC_MSG_RESULT($_my_result)
if test "$_my_result" = "yes" ; then
$1="$$1 $2"