Fix for pants bootstrapping error caused by Wno-error=unused-command-…

…line-argument-hard-error-in-future

Reviewed at https://rbcommons.com/s/twitter/r/562/

build-support/bin/ci.sh

@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 
-# Required on OS X.
-export set ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future
+source build-support/set_archflags.sh
 
 function banner() {
   echo

build-support/pants_venv

@@ -2,8 +2,7 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-# Required on OS X.
-export set ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future
+source build-support/set_archflags.sh
 
 REPO_ROOT=$(cd $(dirname "${BASH_SOURCE[0]}") && cd "$(git rev-parse --show-toplevel)" && pwd)
 

build-support/set_archflags.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# Prevent bootstrapping failure due to unrecognized flag:
+# https://github.com/pantsbuild/pants/issues/78
+function set_archflags() {
+  GCC_VERSION=`gcc -v 2>&1`
+  if [[ "$GCC_VERSION" == *503.0.38* ]]; then
+    # Required for clang version 503.0.38
+    export set ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future
+  fi
+}
+set_archflags