Honor $CC/$CC_host and friends in make generator.

test/compiler-override/gyptest-compiler-env.py

Index: test/compiler-override/gyptest-compiler-env.py
diff --git a/test/compiler-override/gyptest-compiler-env.py b/test/compiler-override/gyptest-compiler-env.py
new file mode 100755
index 0000000000000000000000000000000000000000..896695dbdfbff1e82ebe41ae9d921e136b7f5489
--- /dev/null
+++ b/test/compiler-override/gyptest-compiler-env.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""
+Verifies that the user can override the compiler and linker using CC/CXX/LD
+environment variables.
+"""
+
+import TestGyp
+import os
+import copy
+import sys
+
+here = os.path.dirname(os.path.abspath(__file__))
+
+if sys.platform == 'win32':
+  # cross compiling not support by ninja on windows
+  # and make not supported on windows at all.
+  sys.exit(0)
+
+test = TestGyp.TestGyp(formats=['ninja', 'make'])
+
+def CheckCompiler(test, gypfile, check_for):
+  test.run_gyp(gypfile)
+  test.build(gypfile)
+
+  # We can't test to presence of my_ld.py in the output since
+  # ninja will use CXX_target as the linker regardless
+  test.must_contain_all_lines(test.stdout(), check_for)
+
+oldenv = os.environ.copy()
+try:
+  # Check that CC, CXX and LD set target compiler
+  os.environ['CC'] = 'python %s/my_cc.py FOO' % here
+  os.environ['CXX'] = 'python %s/my_cxx.py FOO' % here
+  os.environ['LD'] = 'python %s/my_ld.py FOO_LINK' % here
+  CheckCompiler(test, 'compiler.gyp',
+                ['my_cc.py', 'my_cxx.py', 'FOO', 'FOO_LINK'])
+finally:
+  os.environ.clear()
+  os.environ.update(oldenv)
+
+try:
+  # Check that CC_host sets host compilee
+  os.environ['CC_host'] = 'python %s/my_cc.py HOST' % here
+  os.environ['CXX_host'] = 'python %s/my_cxx.py HOST' % here
+  os.environ['LD_host'] = 'python %s/my_ld.py HOST_LINK' % here
+  CheckCompiler(test, 'compiler-host.gyp',
+                ['my_cc.py', 'my_cxx.py', 'HOST', 'HOST_LINK'])
+finally:
+  os.environ.clear()
+  os.environ.update(oldenv)
+
+test.pass_test()