84533029c7
mpd uses __atomic_*() built-ins, but forgets to link with -latomic when needed, so this commit adds a patch that ensures it will link with libatomic, and adds a dependency on BR2_TOOLCHAIN_HAS_ATOMIC. Fixes: http://autobuild.buildroot.net/results/e2207280f3a177e12dba502b1c01f5aeb431d04c/ Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
From 8eaf14a17244aaf000b4d19e4fde4a637576939f Mon Sep 17 00:00:00 2001
|
|
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
|
|
Date: Sun, 7 Feb 2016 21:40:47 +0100
|
|
Subject: [PATCH] configure.ac: check if libatomic is needed
|
|
|
|
The mpd source code uses the C++11 <atomic> functionality, which
|
|
internally is implemented using the __atomic_*() gcc built-ins. On
|
|
certain architectures, the __atomic_*() built-ins are implemented in
|
|
the libatomic library that comes with the rest of the gcc runtime. Due
|
|
to this, code using <atomic> might need to link against libatomic,
|
|
otherwise one hits build issues such as:
|
|
|
|
GlobalEvents.cxx:(.text._ZN12GlobalEvents4EmitENS_5EventE+0x14): undefined reference to `__atomic_fetch_or_4'
|
|
|
|
on an architecture like SPARC.
|
|
|
|
To solve this, a configure.ac check is added to know if we need to
|
|
link against libatomic or not.
|
|
|
|
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
|
|
---
|
|
configure.ac | 2 ++
|
|
1 file changed, 2 insertions(+)
|
|
|
|
diff --git a/configure.ac b/configure.ac
|
|
index 107b45a..8e6fab7 100644
|
|
--- a/configure.ac
|
|
+++ b/configure.ac
|
|
@@ -233,6 +233,8 @@ if test x$have_pthread_setname_np = xyes; then
|
|
AC_DEFINE(HAVE_PTHREAD_SETNAME_NP, 1, [Is pthread_setname_np() available?])
|
|
fi
|
|
|
|
+AC_SEARCH_LIBS([__atomic_load_4], [atomic])
|
|
+
|
|
dnl ---------------------------------------------------------------------------
|
|
dnl Event loop selection
|
|
dnl ---------------------------------------------------------------------------
|
|
--
|
|
2.6.4
|
|
|