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Build: Detect supported compiler warning flags better. 

Clang and nowadays also GCC accept any -Wfoobar option
but then may give a warning that an unknown warning option
was specified. To avoid adding unsupported warning options,
the options are now tested with -Werror.

Thanks to Charles Diza.
This commit is contained in:
Lasse Collin 2014-09-25 18:38:48 +03:00
parent 76e75522ed
commit c4911f2db3
1 changed files with 3 additions and 2 deletions
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5
configure.ac
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@ -749,8 +749,9 @@ if test "$GCC" = yes ; then
do
AC_MSG_CHECKING([if $CC accepts $NEW_FLAG])
OLD_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $NEW_FLAG"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([void foo(void) { }])], [
CFLAGS="$CFLAGS $NEW_FLAG -Werror"
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[void foo(void); void foo(void) { }])], [
AM_CFLAGS="$AM_CFLAGS $NEW_FLAG"
AC_MSG_RESULT([yes])
], [