From 92ea7c43375c3c25e712e0b7c3bc8e9dab02b832 Mon Sep 17 00:00:00 2001
From: sknigh <sknigh@sandia.gov>
Date: Fri, 28 Jul 2017 09:32:53 -0700
Subject: Fix for m4%clang (#4912)

* Fix for m4%clang

* Restricted condition to not subsitute rtlib on OSX
---
 var/spack/repos/builtin/packages/m4/package.py | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'var')

diff --git a/var/spack/repos/builtin/packages/m4/package.py b/var/spack/repos/builtin/packages/m4/package.py
index c01828d720..550e306712 100644
--- a/var/spack/repos/builtin/packages/m4/package.py
+++ b/var/spack/repos/builtin/packages/m4/package.py
@@ -48,6 +48,9 @@ class M4(AutotoolsPackage):
         spec = self.spec
         args = ['--enable-c++']
 
+        if spec.satisfies('%clang') and not spec.satisfies('platform=darwin'):
+            args.append('CFLAGS=-rtlib=compiler-rt')
+
         if '+sigsegv' in spec:
             args.append('--with-libsigsegv-prefix={0}'.format(
                 spec['libsigsegv'].prefix))
-- 
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