From: Amos Jeffries <squid3@treenet.co.nz>
Date: Sun, 8 Nov 2015 15:09:16 +0000 (-0800)
Subject: Fix compile erorr on clang undefined reference to '__atomic_load_8'
X-Git-Tag: SQUID_4_0_3~35
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b0f89121135aae68fbaf2aa33b5fb2e0da66d3e;p=thirdparty%2Fsquid.git

Fix compile erorr on clang undefined reference to '__atomic_load_8'

Later versions of GCC on some architectures push atomic functions
out into a separate atomic library. Older versions of clang do not
handle that automatically and require the library to be linked
explicitly.

Add a check for when this is required and set ATOMICLIB if needed.
---

diff --git a/configure.ac b/configure.ac
index e7cd34d90a..17fda485da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -457,6 +457,10 @@ if test "x$with_dl" = "xyes"; then
   AC_MSG_NOTICE([With dl])
 fi
 
+## check for atomics library before anything that might need it
+AC_SEARCH_LIBS([__atomic_load_8],[atomic],[ATOMICLIB="-latomic"],[])
+AC_SUBST(ATOMICLIB)
+
 AC_SEARCH_LIBS([shm_open], [rt])
 if test "x$ac_cv_search_shm_open" != "xno" ; then
   AC_DEFINE(HAVE_SHM,1,[Support shared memory features])
diff --git a/src/Makefile.am b/src/Makefile.am
index 5d7e345380..9da154bf39 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -586,6 +586,7 @@ squid_LDADD = \
 	$(top_builddir)/lib/libmisccontainers.la \
 	$(top_builddir)/lib/libmiscencoding.la \
 	$(top_builddir)/lib/libmiscutil.la \
+	$(ATOMICLIB) \
 	$(SSLLIB) \
 	$(EPOLL_LIBS) \
 	$(MINGW_LIBS) \