diff options
| -rw-r--r-- | configure.in | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/configure.in b/configure.in index 2420fa6..b2607bb 100644 --- a/configure.in +++ b/configure.in @@ -158,11 +158,21 @@ case "${host_os}" in # Define on NetBSD to enable all library features CPPFLAGS="-D_NETBSD_SOURCE $CPPFLAGS" AC_DEFINE(ZMQ_HAVE_NETBSD, 1, [Have NetBSD OS]) - # NetBSD 5.0 and newer provides atomic operations + # NetBSD 5.0 and newer provides atomic operations but we can + # only use these on systems where PR #42842 has been fixed so + # we must try and link a test program using C++. netbsd_has_atomic=no - # XXX As of 5.0.1 the functions declared in atomic.h are - # missing "extern C", disable this until upstream fixes it. - # AC_CHECK_HEADERS(atomic.h, [netbsd_has_atomic=yes]) + AC_MSG_CHECKING([whether atomic operations can be used]) + AC_LANG_PUSH([C++]) + AC_LINK_IFELSE([AC_LANG_PROGRAM( + [[#include <atomic.h>]], + [[uint32_t value; + atomic_cas_32 (&value, 0, 0); + return 0;]])], + [netbsd_has_atomic=yes], + [netbsd_has_atomic=no]) + AC_LANG_POP([C++]) + AC_MSG_RESULT([$netbsd_has_atomic]) if test "x$netbsd_has_atomic" = "xno"; then AC_DEFINE(ZMQ_FORCE_MUTEXES, 1, [Force to use mutexes]) fi |