forked from OSchip/llvm-project
55 lines
2.1 KiB
Python
55 lines
2.1 KiB
Python
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# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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"""A macro to produce a loadable plugin library for the target OS.
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This macro produces a `cc_binary` rule with the name `name + "_impl"`. It
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forces the rule to statically link in its dependencies but to be linked as a
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shared "plugin" library. It then creates binary aliases to `.so`, `.dylib`
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,and `.dll` suffixed names for use on various platforms and selects between
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these into a filegroup with the exact name passed to the macro.
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"""
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load("@rules_cc//cc:defs.bzl", "cc_binary")
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load(":binary_alias.bzl", "binary_alias")
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def cc_plugin_library(name, **kwargs):
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# Neither the name of the plugin binary nor tags on whether it is built are
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# configurable. Instead, we build a `cc_binary` that implements the plugin
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# library using a `_impl` suffix. Bazel will use appropriate flags to cause
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# this file to be a plugin library regardless of its name. We then create
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# binary aliases in the different possible platform names, and select
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# between these different names into a filegroup. The macro's name becomes
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# the filegroup name and it contains exactly one target that is the target
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# platform suffixed plugin library.
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#
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# All-in-all, this is a pretty poor workaround. I think this is part of the
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# Bazel issue: https://github.com/bazelbuild/bazel/issues/7538
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cc_binary(
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name = name + "_impl",
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linkshared = True,
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linkstatic = True,
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**kwargs
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)
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binary_alias(
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name = name + ".so",
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binary = ":" + name + "_impl",
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)
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binary_alias(
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name = name + ".dll",
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binary = ":" + name + "_impl",
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)
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binary_alias(
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name = name + ".dylib",
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binary = ":" + name + "_impl",
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)
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native.filegroup(
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name = name,
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srcs = select({
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"@bazel_tools//src/conditions:windows": [":" + name + ".dll"],
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"@bazel_tools//src/conditions:darwin": [":" + name + ".dylib"],
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"//conditions:default": [":" + name + ".so"],
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}),
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)
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