py37-tensorflow @1.14.0_2: Build error

[mf2k (Frank Schima)]

I'm seeing the following error trying to build py37-tensorflow:

:info:build   external/local_config_cc/cc_wrapper.sh -o bazel-out/host/bin/external/grpc/grpc_cpp_plugin bazel-out/host/bin/external/grpc/_objs/grpc_cpp_plugin/cpp_plugin.o bazel-out/host/bin/external/grpc/libgrpc_plugin_support.a bazel-out/host/bin/external/protobuf_archive/libprotoc_lib.a bazel-out/host/bin/external/protobuf_archive/libprotobuf.a bazel-out/host/bin/external/protobuf_archive/libprotobuf_lite.a bazel-out/host/bin/external/zlib_archive/libzlib.a -pthread -pthread -lpthread -lm -lpthread -lm -lpthread -lm -Wl,-S -undefined dynamic_lookup -headerpad_max_install_names -lstdc++ -lm '')
:info:build ERROR: /opt/local/var/macports/build/_opt_local_var_macports_sources_github.com_macports_macports-ports_python_py-tensorflow/py37-tensorflow/work/60261d8adb0a7b542ce2e82cda02059b/external/grpc/BUILD:439:1: Linking of rule '@grpc//:grpc_cpp_plugin' failed (Exit 1)
:info:build gcc: error: : No such file or directory

[cjones051073 (Chris Jones)]

Sorry, no idea. Don't have my 10.14 machine available at the moment (in for battery replacement) but the previous revision of 1.14.0 built fine.

​http://packages.macports.org/py37-tensorflow/

One thought - Do you by chance have a gcc 'port selected' ? If so, please undo this (select none) and try again.

[mf2k (Frank Schima)]

$ port select gcc
Available versions for gcc:
	mp-gcc8 (active)
	none

Yes I do. Of course a port should not be influenced by that. Thanks for the workaround.

[cjones051073 (Chris Jones)]

Did it work then, with none selected ?

I totally agree ports should not be affected by a choice like this. bazel builds though, are really (REALLY) hard to control and stop stuff like this happening.

In fact, I have already been forced into putting a check into the bazel port itself to detect this and warn the user.

​https://github.com/macports/macports-ports/blob/752673a679233d9f1e77e0db10ac5f0ba89bc4eb/devel/bazel/Portfile#L172

seems like, until someone can figure out how to control bazel to prevent this, I will have to do the same with tensorflow...

[Chris Jones <jonesc@…>]

In 996680527ba3d17d53ff6c7cde16da68b4a2bccf/macports-ports (master):

py-tensorflow: detect if gcc is 'port selected' and error out, as this causes build failures.
Closes: #58679

[mf2k (Frank Schima)]

I finally checked on this. Yes, it works for me now.