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configure.ac: Add a --disable-lto configure option

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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>
This commit is contained in:
Bryce Harrington 2014-07-08 13:14:20 -07:00
parent 0f46fc8dc1
commit c3645d97eb
1 changed files with 10 additions and 5 deletions
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15
build/configure.ac.warnings
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@ -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"