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- Fix build with gcc 4.9
- cairo fails to build with gcc 4.9 due to a bad interaction of cairo
- modules with the LTO mechanism. The suggested workaround is to pass
- -ffat-lto-objects. See
- https://bugs.freedesktop.org/show_bug.cgi?id=77060 for the upstream
- bug report, and
- https://bugs.archlinux.org/task/40313?project=1&openedfrom=-1+week for
- the ArchLinux bug report.
- This patch passes -ffat-lto-objects when gcc understands this option,
- in order to provide compatibility with gcc versions older than 4.8,
- which did not provide this option, but are anyway unaffected by the
- issue.
- Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
- Index: b/configure.ac
- ===================================================================
- --- a/configure.ac
- +++ b/configure.ac
- @@ -37,6 +37,16 @@
- m4_include(build/configure.ac.pthread) dnl checks for pthreads
- AC_CACHE_SAVE
-
- +old_cflags=$CFLAGS
- +CFLAGS=-ffat-lto-objects
- +AC_MSG_CHECKING([whether CC supports -ffat-lto-objects])
- +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
- + [AC_MSG_RESULT([yes])]
- + [LTO_CFLAGS=-ffat-lto-objects],
- + [AC_MSG_RESULT([no])]
- +)
- +CFLAGS="${old_CFLAGS} ${LTO_CFLAGS}"
- +
- dnl ===========================================================================
-
- AC_CHECK_LIB(z, compress,
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