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| author | Marcus Meissner <meissner@suse.de> | 2012-04-14 14:47:02 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2012-04-14 14:48:32 +0100 |
| commit | d486ea30f1a58640a1178de74f705a73845b1cda (patch) | |
| tree | ab04753a57f003768779c653ab2588f18f7c6662 | |
| parent | 25abe582982caeb07d1e0af4acca53bb110a33bf (diff) | |
configure: Conditionally include -flto
As some systems fail to create working binaries with when linked with
lto, perform a check during configure.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=39114
| -rw-r--r-- | build/configure.ac.warnings | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/build/configure.ac.warnings b/build/configure.ac.warnings index 3b2c6f31f..9b9c742a2 100644 --- a/build/configure.ac.warnings +++ b/build/configure.ac.warnings @@ -32,7 +32,18 @@ MAYBE_WARN="$MAYBE_WARN -erroff=E_ENUM_TYPE_MISMATCH_ARG \ dnl We also abuse the warning-flag facility to enable other compiler dnl options. Namely, the following: -MAYBE_WARN="$MAYBE_WARN -fno-strict-aliasing -fno-common -flto" + +dnl -flto working really needs a test link, not just a compile + +safe_MAYBE_WARN="$MAYBE_WARN" +MAYBE_WARN="$MAYBE_WARN -flto" +AC_TRY_LINK([],[ + int main(int argc, char **argv) { return 0; } +],[],[ + MAYBE_WARN="$safe_MAYBE_WARN" +]) + +MAYBE_WARN="$MAYBE_WARN -fno-strict-aliasing -fno-common" dnl Also to turn various gcc/glibc-specific preprocessor checks MAYBE_WARN="$MAYBE_WARN -Wp,-D_FORTIFY_SOURCE=2" |