From 67fcbf9328614379fee28bed83ae6749ce7a3dda Mon Sep 17 00:00:00 2001
From: odaira <odaira@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 9 Oct 2018 20:06:36 +0000
Subject: [PATCH] * configure.ac: do not use __builtin_longjmp on ppc64* Linux 
  because it causes a segmentation fault with MJIT

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64983 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index df1ef8cf2e..d7de84287b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -980,6 +980,14 @@ main()
 [aix*],[	LIBS="-lm $LIBS"
 		ac_cv_func_round=no
 		],
+[linux*],[	LIBS="-lm $LIBS"
+		# __builtin_longjmp in ppc64* Linux does not restore
+		# the TOC register (r2), which is problematic
+		# when a global exit happens from JITted .so code.
+		AS_CASE(["$target_cpu"], [powerpc64*], [
+			ac_cv_func___builtin_setjmp=no
+		])
+		],
 [	LIBS="-lm $LIBS"])
 : ${ORIG_LIBS=$LIBS}