From 96824aa5d000c9060a18e9c1958aea6626cfc423 Mon Sep 17 00:00:00 2001
From: Torbjorn Granlund <torbjorng@google.com>
Date: Mon, 13 Oct 2014 21:35:14 +0200
Subject: (freebsd hacked gcc): Test for crash-prone FreeBSD gcc.

---
 acinclude.m4 | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'acinclude.m4')

diff --git a/acinclude.m4 b/acinclude.m4
index a1997f110..e9a28e47c 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -634,6 +634,20 @@ int dummy;
 #endif
 ])
 
+GMP_PROG_CC_WORKS_PART([$1], [freebsd hacked gcc],
+[/* Provokes an ICE on i386-freebsd with the FreeBSD-hacked gcc, under
+   -O2 -march=amdfam10.  We call helper functions here "open" and "close" in
+   order for linking to succeed.  */
+
+#if defined (__GNUC__) && ! defined (__cplusplus)
+int open(int*,int*,int);void*close(int);void g(int*rp,int*up,int un){
+__builtin_expect(un<=0x7f00,1)?__builtin_alloca(un):close(un);if(__builtin_clzl
+(up[un])){open(rp,up,un);while(1){if(rp[un-1]!=0)break;un--;}}}
+#else
+int dummy;
+#endif
+])
+
 GMP_PROG_CC_WORKS_PART_MAIN([$1], [mpn_lshift_com optimization],
 [/* The following is mis-compiled by HP ia-64 cc version
         cc: HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]
-- 
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