From 1468a6f45408ba22e678f7c954b6192cbcbc087a Mon Sep 17 00:00:00 2001
From: Ivan Maidanski <ivmai@mail.ru>
Date: Thu, 23 Mar 2017 11:45:31 +0300
Subject: [PATCH] Detect sigsetjmp() availability by configure

* configure.ac (AC_TRY_LINK(sigsetjmp)): Add (define GC_NO_SIGSETJMP
if sigsetjmp is not available).
---
 configure.ac | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/configure.ac b/configure.ac
index 7561e1f..94e6fbc 100644
--- 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,
-- 
2.7.4