Bazel 0.5.0 build fails on Mac OS X El Capitan

[zanes2016]

Description of the problem / feature request / question:

Bazel build fails on Mac OS X El Capitan (Version 10.11.6). The same build completes without any issue on Ubuntu 14.04. It looks like this is a mac specific issue.

Mac (build error):

$ bazel version
Build label: 0.5.0-homebrew
Build target: bazel-out/darwin_x86_64-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Fri May 26 14:50:47 2017 (1495810247)
Build timestamp: 1495810247
Build timestamp as int: 1495810247
$
$
$ sw_vers 
ProductName:	Mac OS X
ProductVersion:	10.11.6
BuildVersion:	15G1510
$
$
$ bazel build --verbose_failures :all
ERROR: in target '//external:cc_toolchain': no such package '@local_config_cc//': Traceback (most recent call last):
	File "/private/var/tmp/_bazel_user/6f6133ece88806ce1513398e26791cf1/external/bazel_tools/tools/cpp/cc_configure.bzl", line 829
		_get_escaped_darwin_cxx_inc_directories(repository_ctx, cc)
	File "/private/var/tmp/_bazel_user/6f6133ece88806ce1513398e26791cf1/external/bazel_tools/tools/cpp/cc_configure.bzl", line 726, in _get_escaped_darwin_cxx_inc_directories
		for toolchain in toolchains: ...
type 'NoneType' is not iterable.
INFO: Elapsed time: 3.445s

Ubuntu (no error):

$ bazel version
Build label: 0.5.0
Build target: bazel-out/local-fastbuild/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Fri May 26 12:11:50 2017 (1495800710)
Build timestamp: 1495800710
Build timestamp as int: 1495800710
$
$
$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.4 LTS
Release:	14.04
Codename:	trusty
$
$
$ # I already ran the build, it succeeded without any issues
$ bazel build --verbose_failures :all
INFO: Found 1 target...
Target //:env up-to-date (nothing to build)
INFO: Elapsed time: 0.128s, Critical Path: 0.00s

If possible, provide a minimal example to reproduce the problem:

On a mac, the following produces the error

$ bazel build --verbose_failures :all

Environment info

• Operating System:
  ProductName: Mac OS X
  ProductVersion: 10.11.6
  BuildVersion: 15G1510

• Bazel version (output of bazel info release):
  release 0.5.0-homebrew

Anything else, information or logs or outputs that would be helpful?

I'm trying to build the same project on both mac and ubuntu which is version controlled with git. So i'm confident that the two build sources are identical.

[damienmg]

Can you try to rebuild after bazel clean --expunge?

[damienmg]

(I use macOS El Capitan without issue, btw)

[zanes2016]

I still have the same issue:

$ bazel clean --expunge
INFO: Starting clean (this may take a while). Consider using --expunge_async if the clean takes more than several minutes.
$
$ bazel build :all
..............................................
ERROR: in target '//external:cc_toolchain': no such package '@local_config_cc//': Traceback (most recent call last):
	File "/private/var/tmp/_bazel_user/6f6133ece88806ce1513398e26791cf1/external/bazel_tools/tools/cpp/cc_configure.bzl", line 829
		_get_escaped_darwin_cxx_inc_directories(repository_ctx, cc)
	File "/private/var/tmp/_bazel_user/6f6133ece88806ce1513398e26791cf1/external/bazel_tools/tools/cpp/cc_configure.bzl", line 726, in _get_escaped_darwin_cxx_inc_directories
		for toolchain in toolchains: ...
type 'NoneType' is not iterable.
INFO: Elapsed time: 4.959s

[damienmg]

/cc @mhlopko undetected regression of 0.5.0 :(

@c-parsons this is happening because xcode_locator does not returns any toolchain, I don't know how it works but if we do not find a user side workaround, we need to do a patch release.

[damienmg]

@zanes2016: as much information about your xcode installation would help. gcc --version also

[zanes2016]

$ gcc --version
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

[damienmg]

/cc @c-parsons now Bazel is failing to build C++ code if you don't have xcode installed.

@zanes2016 seems like my only fix right now is to install xcode :( sorry for that.

[c-parsons]

I've thrown together a fix for this, sending it to you right now, Damien.
Sorry for the breakage -- we apparently don't have a good CI environment to exercise this situation.

[damienmg]

Well if installing xcode fix the issue this might be an acceptable workaround. 0.5.1 should be in less than a month.

Yes having all the use case in a CI is hard.

[MarkusTeufelberger]

Looks like #3060 is another instance of this?

[damienmg]

Indeed it is, we will start seeing a lot of bug report, good thing I am in the US right now, I'll might cut a patch release if that start to have a lot of feedback.