41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
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From 8eaf14a17244aaf000b4d19e4fde4a637576939f Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Sun, 7 Feb 2016 21:40:47 +0100
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Subject: [PATCH] configure.ac: check if libatomic is needed
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The mpd source code uses the C++11 <atomic> functionality, which
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internally is implemented using the __atomic_*() gcc built-ins. On
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certain architectures, the __atomic_*() built-ins are implemented in
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the libatomic library that comes with the rest of the gcc runtime. Due
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to this, code using <atomic> might need to link against libatomic,
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otherwise one hits build issues such as:
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GlobalEvents.cxx:(.text._ZN12GlobalEvents4EmitENS_5EventE+0x14): undefined reference to `__atomic_fetch_or_4'
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on an architecture like SPARC.
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To solve this, a configure.ac check is added to know if we need to
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link against libatomic or not.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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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 107b45a..8e6fab7 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -233,6 +233,8 @@ if test x$have_pthread_setname_np = xyes; then
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AC_DEFINE(HAVE_PTHREAD_SETNAME_NP, 1, [Is pthread_setname_np() available?])
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fi
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+AC_SEARCH_LIBS([__atomic_load_4], [atomic])
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+
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dnl ---------------------------------------------------------------------------
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dnl Event loop selection
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dnl ---------------------------------------------------------------------------
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--
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2.6.4
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