35 lines
1015 B
Diff
35 lines
1015 B
Diff
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From f020fe05a20dfcd16cd7df833dcf3cdeef770538 Mon Sep 17 00:00:00 2001
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From: Carlos Santos <casantos@datacom.ind.br>
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Date: Thu, 11 Feb 2016 10:58:35 -0200
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Subject: [PATCH 2/2] configure.ac: check if libatomic is needed
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Compilation of protobuf for PowerPC and SPARC may fail due to missing
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references to __atomic_fetch_add_4 and __atomic_compare_exchange_4.
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The __atomic_*() intrinsics for all sizes are provided by libatomic when
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gcc is >= 4.8. This can be achieved by adding this to configure.ac:
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AC_SEARCH_LIBS([__atomic_fetch_add_4], [atomic])
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Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
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---
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configure.ac | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/configure.ac b/configure.ac
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index c07067c..88d4a0d 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -139,6 +139,8 @@ AM_CONDITIONAL([USE_EXTERNAL_PROTOC], [test "$with_protoc" != "no"])
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ACX_PTHREAD
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AC_CXX_STL_HASH
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+AC_SEARCH_LIBS([__atomic_load_4], [atomic])
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+
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case "$target_os" in
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mingw* | cygwin* | win*)
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;;
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--
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2.5.0
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