Support for custom NM/readelf binaries in your toolchain.

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

+#!/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/NM/READELF 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

[Nico, 2014/08/27 14:27:05]

*supported

[Dimi Shahbaz, 2014/08/27 18:25:51]

Done. (And fixed in adjacent file where I copied this from)

+  # and make not supported on windows at all.
+  sys.exit(0)
+
+# Clear any existing compiler related env vars.
+for key in ['CC', 'CXX', 'LINK', 'CC_host', 'CXX_host', 'LINK_host',
+            'NM_target', 'READELF_target']:
+  if key in os.environ:
+    del os.environ[key]
+
+
+def CheckCompiler(test, gypfile, check_for, run_gyp):
+  if run_gyp:
+    test.run_gyp(gypfile)
+  test.build(gypfile)
+
+  test.must_contain_all_lines(test.stdout(), check_for)
+
+
+test = TestGyp.TestGyp(formats=['ninja'])
+# Must set the test format to something with a flavor (the part after the '-')
+# in order to test the desired behavior. Since we want to run a non-host
+# toolchain, we have to set the flavor to something that the ninja generator
+# doesn't know about, so it doesn't default to the host-specific tools (e.g.,
+# 'otool' on mac to generate the .TOC).
+#
+# Note that we can't just pass format=['ninja-some_toolchain'] to the
+# constructor above, because then this test wouldn't be recognized as a ninja
+# format test.
+test.formats = ['ninja-some_toolchain']
+
+
+def TestTargetOverideSharedLib():
+  # The std output from nm and readelf is redirected to files, so we can't
+  # expect their output to appear. Instead, check for the files they create to
+  # see if they actually ran.
+  expected = ['my_cc.py', 'my_cxx.py', 'FOO']
+
+  # Check that CC, CXX, NM_target, READELF_target, set target compiler
+  oldenv = os.environ.copy()
+  try:
+    os.environ['CC'] = 'python %s/my_cc.py FOO' % here
+    os.environ['CXX'] = 'python %s/my_cxx.py FOO' % here
+    os.environ['NM'] = 'python %s/my_nm.py' % here
+    os.environ['READELF'] = 'python %s/my_readelf.py' % here
+
+    CheckCompiler(test, 'compiler-shared-lib.gyp', expected, True)
+    test.must_contain(test.built_file_path('RAN_MY_NM'), 'RAN_MY_NM')
+    test.must_contain(test.built_file_path('RAN_MY_READELF'), 'RAN_MY_READELF')

[Nico, 2014/08/27 14:27:05]

this is going to fail on os x

[Dimi Shahbaz, 2014/08/27 18:25:51]

it does pass on mac, and the key is that the format has a flavor, which makes it
behave correctly (skipping the 'otool' stuff). this seems to be the established
pattern in gyp.

See comment on line 38-46 above.

+    test.unlink(test.built_file_path('RAN_MY_NM'))
+    test.unlink(test.built_file_path('RAN_MY_READELF'))
+  finally:
+    os.environ.clear()
+    os.environ.update(oldenv)

[Nico, 2014/08/27 14:27:05]

I think we have a context manager for environment stuff in gyp now, see
https://codereview.chromium.org/228323002/ Can that be used here?

[Dimi Shahbaz, 2014/08/27 18:25:51]

Yup, very nice.

+
+  # Run the same tests once the eviron has been restored.  The
+  # generated should have embedded all the settings in the
+  # project files so the results should be the same.
+  CheckCompiler(test, 'compiler-shared-lib.gyp', expected, False)
+  test.must_contain(test.built_file_path('RAN_MY_NM'), 'RAN_MY_NM')
+  test.must_contain(test.built_file_path('RAN_MY_READELF'), 'RAN_MY_READELF')
+
+
+TestTargetOverideSharedLib()
+test.pass_test()