From dc9a978d0707d73024ff241dbe14662737f0947d Mon Sep 17 00:00:00 2001
From: Camm Maguire <camm@debian.org>
Date: Wed, 16 Apr 2014 14:26:40 +0000
Subject: HAVE_SIGALTSTACK macro

---
 gcl/configure      | 10 ++++++++++
 gcl/configure.in   |  3 +--
 gcl/h/gclincl.h.in |  3 +++
 gcl/o/alloc.c      |  2 +-
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/gcl/configure b/gcl/configure
index c8f5d6fb..605b361b 100755
--- a/gcl/configure
+++ b/gcl/configure
@@ -9994,6 +9994,16 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
+for ac_func in sigaltstack
+do :
+  ac_fn_c_check_func "$LINENO" "sigaltstack" "ac_cv_func_sigaltstack"
+if test "x$ac_cv_func_sigaltstack" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_SIGALTSTACK 1
+_ACEOF
+
+fi
+done
 
 
 #if test $use = "386-linux" ; then
diff --git a/gcl/configure.in b/gcl/configure.in
index c6ea2e57..ebb01fa0 100644
--- a/gcl/configure.in
+++ b/gcl/configure.in
@@ -2406,8 +2406,7 @@ int joe=SIGEMT;
  AC_MSG_RESULT(yes)],
 AC_MSG_RESULT(no))
 
-
-
+AC_CHECK_FUNCS(sigaltstack)
 
 #if test $use = "386-linux" ; then
 	AC_CHECK_HEADERS(asm/sigcontext.h)
diff --git a/gcl/h/gclincl.h.in b/gcl/h/gclincl.h.in
index ba8e1a24..a2ddeed6 100644
--- a/gcl/h/gclincl.h.in
+++ b/gcl/h/gclincl.h.in
@@ -180,6 +180,9 @@
 /* have setenv call */
 #undef HAVE_SETENV
 
+/* Define to 1 if you have the `sigaltstack' function. */
+#undef HAVE_SIGALTSTACK
+
 /* have sigcontext */
 #undef HAVE_SIGCONTEXT
 
diff --git a/gcl/o/alloc.c b/gcl/o/alloc.c
index 2edba695..01d652ee 100644
--- a/gcl/o/alloc.c
+++ b/gcl/o/alloc.c
@@ -1037,7 +1037,7 @@ gcl_init_alloc(void *cs_start) {
   }
 #endif
   
-#if defined(HAVE_SIGACTION) || defined(HAVE_SIGVEC)
+#ifdef HAVE_SIGALTSTACK
   {
     /* make sure the stack is 8 byte aligned */
     static double estack_buf[32*SIGSTKSZ];
-- 
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