Issue #247 (bdwgc).
When bdwgc is linked with the external libatomic_ops, bdw-gc.pc must
contain the needed dynamic libraries (such as -latomic_ops) otherwise
build of applications could fail on the link stage on some hosts:
* libgc.so: undefined reference to 'AO_fetch_compare_and_swap_emulation'
* libgc.so: undefined reference to 'AO_store_full_emulation'
So, this commit sets ATOMIC_OPS_LIBS to "-latomic_ops" when a system
atomic_ops library is used and uses ATOMIC_OPS_LIBS in bdw-gc.pc.in.
* bdw-gc.pc.in (Libs): Add @ATOMIC_OPS_LIBS@.
* configure.ac [$with_libatomic_ops!=no && $with_libatomic_ops!=none
&& $THREADS!=none] (ATOMIC_OPS_LIBS): Set to -latomic_ops; do AC_SUBST.
Name: Boehm-Demers-Weiser Conservative Garbage Collector
Description: A garbage collector for C and C++
Version: @PACKAGE_VERSION@
-Libs: -L${libdir} -lgc
+Libs: -L${libdir} @ATOMIC_OPS_LIBS@ -lgc
Cflags: -I${includedir}
AC_MSG_CHECKING([which libatomic_ops to use])
AS_IF([test x"$with_libatomic_ops" != xno],
[ AS_IF([test x"$with_libatomic_ops" != xnone -a x"$THREADS" != xnone],
- [ AC_MSG_RESULT([external]) ],
+ [ AC_MSG_RESULT([external])
+ ATOMIC_OPS_LIBS="-latomic_ops"
+ AC_SUBST([ATOMIC_OPS_LIBS]) ],
[ AC_MSG_RESULT([none])
AS_IF([test x"$THREADS" != xnone],
[ AC_DEFINE([GC_BUILTIN_ATOMIC], [1],