diff options
| author | Bryce Harrington <b.harrington@samsung.com> | 2014-07-08 13:14:20 -0700 |
|---|---|---|
| committer | Uli Schlachter <psychon@znc.in> | 2014-08-27 11:03:39 +0200 |
| commit | ee69e744ee7333a5983f1a9158750bbd73556b55 (patch) | |
| tree | 874af142e168b3d82535ce07c54aede79bee328c | |
| parent | 3434b79281ba592e6b0a89a90ce42499607025f0 (diff) | |
configure.ac: Add a --disable-lto configure option
Link-Time Optimization seems to be stable enough with gcc 4.8 and 4.9,
but has proven to be an issue in the past for many cairo users (webkit,
efl, ubuntu, opensuse, gentoo, arch...) who carry patches to disable it.
Gentoo's patch[1] adds a --disable-lto option to leave it enabled by
default but give users the ability to work around lto related build
problems (c.f. fdo #77060). Patch appears to have been authored by
Alexandre Rostovtsev[2].
1: sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/x11-libs/cairo/files/cairo-1.12.16-lto-optional.patch
2: https://bugs.gentoo.org/show_bug.cgi?id=509552
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=60852
Signed-off-by: Bryce Harrington <b.harrington@samsung.com>
Reviewed-by: Uli Schlachter <psychon@znc.in>
| -rw-r--r-- | build/configure.ac.warnings | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/build/configure.ac.warnings b/build/configure.ac.warnings index f984eb29c..a72d9484a 100644 --- a/build/configure.ac.warnings +++ b/build/configure.ac.warnings @@ -38,13 +38,18 @@ dnl options. Namely, the following: 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([],[ +AC_ARG_ENABLE(lto, + AS_HELP_STRING([--disable-lto], + [Do not try to use Link-Time Optimization])) +if test "x$enable_lto" != "xno"; then + safe_MAYBE_WARN="$MAYBE_WARN" + MAYBE_WARN="$MAYBE_WARN -flto" + AC_TRY_LINK([],[ int main(int argc, char **argv) { return 0; } -],[],[ + ],[],[ MAYBE_WARN="$safe_MAYBE_WARN" -]) + ]) +fi MAYBE_WARN="$MAYBE_WARN -fno-strict-aliasing -fno-common" |