diff options
| author | Thomas Haller <thaller@redhat.com> | 2015-02-24 18:11:21 +0100 |
|---|---|---|
| committer | Thomas Haller <thaller@redhat.com> | 2015-02-24 18:43:44 +0100 |
| commit | ae4c4b615c8102afab208a95ad4d1946c00658c9 (patch) | |
| tree | d53b854fa0337b575d49da539e7acf77ed2c5adb /m4 | |
| parent | 7d70fd758ef1008bb0d3de5f7da8c2e351642e37 (diff) | |
build: fix detecting support for -Wno-* compiler flags
Since GCC 4.4, gcc does not warn about unknown -Wno-* flags. At
least, it does not warning unless another warning is raised as well
(https://gcc.gnu.org/wiki/FAQ#wnowarning).
We didn't notice up to now, because we only tested flags that GCC
actually supports.
Hack around this, by checking for the -W* counterpart instead.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/compiler_warnings.m4 | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/m4/compiler_warnings.m4 b/m4/compiler_warnings.m4 index c05a26d09..412acb975 100644 --- a/m4/compiler_warnings.m4 +++ b/m4/compiler_warnings.m4 @@ -30,7 +30,8 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then -Wundef -Wimplicit-function-declaration \ -Wpointer-arith -Winit-self \ -Wmissing-include-dirs; do - CFLAGS="$CFLAGS_MORE_WARNINGS $CFLAGS_EXTRA $option $CFLAGS_SAVED" + dnl GCC 4.4 does not warn when checking for -Wno-* flags (https://gcc.gnu.org/wiki/FAQ#wnowarning) + CFLAGS="$CFLAGS_MORE_WARNINGS $CFLAGS_EXTRA $(printf '%s' "$option" | sed 's/^-Wno-/-W/') $CFLAGS_SAVED" AC_MSG_CHECKING([whether gcc understands $option]) AC_TRY_COMPILE([], [], has_option=yes, |