Detect sigsetjmp() availability by configure

* configure.ac (AC_TRY_LINK(sigsetjmp)): Add (define GC_NO_SIGSETJMP
if sigsetjmp is not available).

diff --git a/configure.ac b/configure.ac
index 7561e1f..94e6fbc 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -795,6 +795,17 @@ if test x"$have_dladdr" = xyes; then
   AC_DEFINE([HAVE_DLADDR], 1, [Define to use 'dladdr' function.])
 fi
 
+# sigsetjmp could be a macro (thus AC_CHECK_FUNCS cannot be used).
+AC_MSG_CHECKING(for sigsetjmp)
+old_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS $CFLAGS_EXTRA"
+AC_TRY_LINK([#include <setjmp.h>],
+            [sigjmp_buf t; sigsetjmp(t, 0)],
+  [AC_MSG_RESULT(yes)],
+  [AC_MSG_RESULT(no)
+   AC_DEFINE([GC_NO_SIGSETJMP], [1], [Missing sigsetjmp])])
+CFLAGS="$old_CFLAGS"
+
 # Check for AViiON Machines running DGUX
 ac_is_dgux=no
 AC_CHECK_HEADER(sys/dg_sys_info.h,