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# Copyright (c) 2009-2021, Google LLC
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of Google LLC nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY
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# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Repository rule for using Python 3.x headers from the system."""
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_build_file = """
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cc_library(
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name = "python_headers",
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hdrs = glob(["python/**/*.h"]),
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includes = ["python"],
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visibility = ["//visibility:public"],
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)
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"""
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_build_defs_file = """
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EXT_SUFFIX = "%s"
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"""
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def _get_config_var(repository_ctx, name):
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py_program = "import sysconfig; print(sysconfig.get_config_var('%s'), end='')"
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result = repository_ctx.execute(["python3", "-c", py_program % (name)])
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if result.return_code != 0:
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fail("No python3 executable available on the system")
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return result.stdout
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def _python_headers_impl(repository_ctx):
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path = _get_config_var(repository_ctx, "INCLUDEPY")
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ext_suffix = _get_config_var(repository_ctx, "EXT_SUFFIX")
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repository_ctx.symlink(path, "python")
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repository_ctx.file("BUILD.bazel", _build_file)
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repository_ctx.file("build_defs.bzl", _build_defs_file % ext_suffix)
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# The python_headers() repository rule exposes Python headers from the system.
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#
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# In WORKSPACE:
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# python_headers(
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# name = "python_headers_repo",
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# )
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#
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# This repository exposes a single rule that you can depend on from BUILD:
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# cc_library(
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# name = "foobar",
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# srcs = ["foobar.cc"],
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# deps = ["@python_headers_repo//:python_headers"],
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# )
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#
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# The headers should correspond to the version of python obtained by running
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# the `python3` command on the system.
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python_headers = repository_rule(
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implementation = _python_headers_impl,
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local = True,
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)
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