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# Copyright 2021 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
load(
"@bazel_skylib//lib:paths.bzl",
"paths",
)
def _rpath(go, library, executable = None):
"""Returns the potential rpaths of a library, possibly relative to another file."""
if not executable:
return [paths.dirname(library.short_path)]
origin = go.mode.goos == "darwin" and "@loader_path" or "$ORIGIN"
# Accomodate for two kinds of executable paths.
rpaths = []
# 1. Where the executable is inside its own .runfiles directory.
# This is the case for generated libraries as well as remote builds.
# a) go back to the workspace root from the executable file in .runfiles
depth = executable.short_path.count("/")
back_to_root = paths.join(*([".."] * depth))
# b) then walk back to the library's short path
rpaths.append(paths.join(origin, back_to_root, paths.dirname(library.short_path)))
# 2. Where the executable is outside the .runfiles directory:
# This is the case for local pre-built libraries, as well as local
# generated libraries.
runfiles_dir = paths.basename(executable.short_path) + ".runfiles"
rpaths.append(paths.join(origin, runfiles_dir, go._ctx.workspace_name, paths.dirname(library.short_path)))
return rpaths
def _flags(go, *args, **kwargs):
"""Returns the rpath linker flags for a library."""
return ["-Wl,-rpath," + p for p in _rpath(go, *args, **kwargs)]
def _install_name(f):
"""Returns the install name for a dylib on macOS."""
return f.short_path
rpath = struct(
flags = _flags,
install_name = _install_name,
rpath = _rpath,
)
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