mirror of
https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
synced 2024-09-20 13:51:05 +00:00
5d8e12df98
Conditionally applies a GCC-only flag when building with gcc. Change-Id: I22d8decbd780db89b3b07c6880ff4f46a185897f Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/66784 Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com> Reviewed-by: Wyatt Hepler <hepler@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
// Copyright 2021 The Pigweed Authors
|
|
//
|
|
// 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
|
|
//
|
|
// https://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.
|
|
|
|
#include "pw_build_info/build_id.h"
|
|
|
|
#include <cstdint>
|
|
#include <cstring>
|
|
#include <span>
|
|
|
|
#include "pw_preprocessor/compiler.h"
|
|
|
|
extern "C" const uint8_t gnu_build_id_begin;
|
|
|
|
namespace pw::build_info {
|
|
namespace {
|
|
|
|
PW_PACKED(struct) ElfNoteInfo {
|
|
uint32_t name_size;
|
|
uint32_t descriptor_size;
|
|
uint32_t type;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
// Reading more than a uint8_t from gnu_build_id_begin triggers compiler
|
|
// warnings that must be silenced.
|
|
PW_MODIFY_DIAGNOSTICS_PUSH();
|
|
PW_MODIFY_DIAGNOSTIC(ignored, "-Warray-bounds");
|
|
PW_MODIFY_DIAGNOSTIC_GCC(ignored, "-Wstringop-overflow");
|
|
|
|
std::span<const std::byte> BuildId() {
|
|
// Read the sizes at the beginning of the note section.
|
|
ElfNoteInfo build_id_note_sizes;
|
|
memcpy(
|
|
&build_id_note_sizes, &gnu_build_id_begin, sizeof(build_id_note_sizes));
|
|
// Skip the "name" entry of the note section, and return a span to the
|
|
// descriptor.
|
|
return std::as_bytes(std::span(&gnu_build_id_begin +
|
|
sizeof(build_id_note_sizes) +
|
|
build_id_note_sizes.name_size,
|
|
build_id_note_sizes.descriptor_size));
|
|
}
|
|
|
|
PW_MODIFY_DIAGNOSTICS_POP();
|
|
|
|
} // namespace pw::build_info
|