mirror of
https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
7b9ec95118
Ran into this trying to debug #5428 Before: ``` lex.cpp:793:21: runtime error: null pointer passed as argument 1, which is declared to never be null string.h:90:51: note: nonnull attribute specified here SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior lex.cpp:793:21 ``` After: ``` lex.cpp:793:21: runtime error: null pointer passed as argument 1, which is declared to never be null string.h:90:51: note: nonnull attribute specified here #0 0x5572db22a680 in Carbon::Lex::Lexer::MakeLines(llvm::StringRef) /proc/self/cwd/toolchain/lex/lex.cpp:793:14 #1 0x5572db227ee4 in Lex /proc/self/cwd/toolchain/lex/lex.cpp:738:3 (etc) SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior lex.cpp:793:21 ``` Interestingly, even though this is labelled as UB, it's using the ASAN_SYMBOLIZER_PATH (specifically not LLVM_SYMBOLIZER_PATH). But canonically UBSAN_SYMBOLIZER_PATH may also be used per https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/ubsan/ubsan_flags.cpp#L53, so I'm adding it to the list out of an excess of caution. Also doing some small related cleanup: - Removing `ASAN_SYMBOLIZER_PATH` from `--test_env` because it should now be getting overridden by these settings (also was a little inconsistent in that `LLVM_SYMBOLIZER_PATH` was not included). - Improving the environment construction and documentation.
47 lines
1.5 KiB
Python
47 lines
1.5 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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# Settings which apply cross-platform.
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# buildifier: disable=unsorted-dict-items
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common_env = {
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"LLVM_SYMBOLIZER_PATH": llvm_symbolizer,
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# Sanitizers don't use LLVM as fallback, but sometimes ASAN may be used
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# for UBSAN errors; we still set UBSAN in case it's directly used.
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"ASAN_SYMBOLIZER_PATH": llvm_symbolizer,
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"UBSAN_SYMBOLIZER_PATH": llvm_symbolizer,
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# Default to printing traces for UBSAN.
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"UBSAN_OPTIONS": "print_stacktrace=1",
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}
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# On macOS, there's a nano zone allocation warning when asan is enabled.
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# This suppresses the warning in `bazel run`.
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macos_env = {"MallocNanoZone": "0"}
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return common_env | select({
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"//bazel/cc_toolchains:macos_asan": macos_env,
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"//conditions:default": {},
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})
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