From ec2990716005b4b41bab6b707ada0206c1655be8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Sun, 14 Jun 2015 14:41:01 +0200
Subject: [PATCH] gnu: gcc: Build libsanitizer's bundled libbacktrace without
 -Werror.

* gnu/packages/gcc.scm (gcc-4.7)[arguments]: Also patch
  libsanitizer/libbacktrace/Makefile.in.
---
 gnu/packages/gcc.scm | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/gcc.scm b/gnu/packages/gcc.scm
index 414f31cb3c..beb007e95b 100644
--- a/gnu/packages/gcc.scm
+++ b/gnu/packages/gcc.scm
@@ -246,7 +246,13 @@ where the OS part is overloaded to denote a specific ABI---into GCC
                 ;; 2.21's stdlib-bsearch.h.  Remove -Werror.
                 (substitute* "libbacktrace/configure"
                   (("WARN_FLAGS=(.*)-Werror" _ flags)
-                   (string-append "WARN_FLAGS=" flags))))
+                   (string-append "WARN_FLAGS=" flags)))
+
+                (when (file-exists? "libsanitizer/libbacktrace")
+                  ;; Same in libsanitizer's bundled copy (!) found in 4.9+.
+                  (substitute* "libsanitizer/libbacktrace/Makefile.in"
+                    (("-Werror")
+                     ""))))
 
               ;; Add a RUNPATH to libstdc++.so so that it finds libgcc_s.
               ;; See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32354>