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