Squashed 'third_party/bazel-toolchain/' content from commit a912bb381
Change-Id: Ie1ff8ed3b3948cca1d1b6227097c95e5a048de86
git-subtree-dir: third_party/bazel-toolchain
git-subtree-split: a912bb381b36437be0eeb22de11f0ea198450b4e
Signed-off-by: Brian Silverman <bsilver16834@gmail.com>
diff --git a/toolchain/cc_wrapper.sh.tpl b/toolchain/cc_wrapper.sh.tpl
new file mode 100644
index 0000000..6be2fbb
--- /dev/null
+++ b/toolchain/cc_wrapper.sh.tpl
@@ -0,0 +1,48 @@
+#!/bin/bash
+#
+# 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.
+#
+# OS X relpath is not really working. This is a wrapper script around gcc
+# to simulate relpath behavior.
+#
+# This wrapper uses install_name_tool to replace all paths in the binary
+# (bazel-out/.../path/to/original/library.so) by the paths relative to
+# the binary. It parses the command line to behave as rpath is supposed
+# to work.
+#
+# See https://blogs.oracle.com/dipol/entry/dynamic_libraries_rpath_and_mac
+# on how to set those paths for Mach-O binaries.
+#
+set -eu
+
+# See note in toolchain/internal/configure.bzl where we define
+# `wrapper_bin_prefix` for why this wrapper is needed.
+
+# Call the C++ compiler.
+if [[ -f %{toolchain_path_prefix}bin/clang ]]; then
+ exec %{toolchain_path_prefix}bin/clang "$@"
+elif [[ "${BASH_SOURCE[0]}" == "/"* ]]; then
+ # Some consumers of `CcToolchainConfigInfo` (e.g. `cmake` from rules_foreign_cc)
+ # change CWD and call $CC (this script) with its absolute path.
+ # the execroot (i.e. `cmake` from `rules_foreign_cc`) and call CC . For cases like this,
+ # we'll try to find `clang` relative to this script.
+ # This script is at _execroot_/external/_repo_name_/bin/clang_wrapper.sh
+ execroot_path="${BASH_SOURCE[0]%/*/*/*/*}"
+ clang="${execroot_path}/%{toolchain_path_prefix}bin/clang"
+ exec "${clang}" "${@}"
+else
+ >&2 echo "ERROR: could not find clang; PWD=\"$(pwd)\"; PATH=\"${PATH}\"."
+ exit 5
+fi