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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
69d1d344bc
https://bazel.build/rules/lib/core/dict#update indicates it returns `None`. Maybe this hasn't worked for a long time, and was missed due to the issue fixed by #4363
42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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# Exceptions. See /LICENSE for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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"""Provides helpers for cc rules. Intended for general consumption."""
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load("@bazel_cc_toolchain//:clang_detected_variables.bzl", "llvm_symbolizer")
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def cc_env():
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"""Returns standard environment settings for a cc_binary.
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In use, this looks like:
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```
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load("//bazel/cc_toolchains:defs.bzl", "cc_env")
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cc_binary(
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...
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env = cc_env(),
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)
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```
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We're currently setting this on a target-by-target basis, mainly because
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it's difficult to modify default behaviors.
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"""
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# On macOS, there's a nano zone allocation warning due to asan (arises
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# in fastbuild/dbg). This suppresses the warning in `bazel run`.
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#
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# Concatenation of a dict with a select isn't supported, so we concatenate
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# within the select.
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# https://github.com/bazelbuild/bazel/issues/12457
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return select({
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"//bazel/cc_toolchains:macos_asan": {
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"LLVM_SYMBOLIZER_PATH": llvm_symbolizer,
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"MallocNanoZone": "0",
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},
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"//conditions:default": {
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"LLVM_SYMBOLIZER_PATH": llvm_symbolizer,
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},
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})
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