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Jul 24, 2025
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[bazel] Port #149198 #150352

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33 changes: 31 additions & 2 deletions utils/bazel/llvm_configs/abi-breaking.h.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -12,12 +12,41 @@
#ifndef LLVM_ABI_BREAKING_CHECKS_H
#define LLVM_ABI_BREAKING_CHECKS_H

// llvm-config.h is required for LLVM_ENABLE_LLVM_EXPORT_ANNOTATIONS
#include "llvm/Config/llvm-config.h"

/* Define to enable checks that alter the LLVM C++ ABI */
#cmakedefine01 LLVM_ENABLE_ABI_BREAKING_CHECKS

/* Define to enable reverse iteration of unordered llvm containers */
#cmakedefine01 LLVM_ENABLE_REVERSE_ITERATION

#if !defined(__has_attribute)
#define __has_attribute(attribute) 0
#endif

// Properly annotate EnableABIBreakingChecks or DisableABIBreakingChecks for
// export from shared library.
// TODO(https://github.com/llvm/llvm-project/issues/145406): eliminate need for
// two preprocessor definitions to gate LLVM_ABI macro definitions.
#if defined(LLVM_BUILD_STATIC) || !defined(LLVM_ENABLE_LLVM_EXPORT_ANNOTATIONS)
#define ABI_BREAKING_EXPORT_ABI
#else
#if defined(_WIN32)
#if defined(LLVM_EXPORTS)
#define ABI_BREAKING_EXPORT_ABI __declspec(dllexport)
#else
#define ABI_BREAKING_EXPORT_ABI __declspec(dllimport)
#endif
#else
#if __has_attribute(visibility)
#define ABI_BREAKING_EXPORT_ABI __attribute__((__visibility__("default")))
#else
#define ABI_BREAKING_EXPORT_ABI
#endif
#endif
#endif

/* Allow selectively disabling link-time mismatch checking so that header-only
ADT content from LLVM can be used without linking libSupport. */
#if !defined(LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING) || !LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING
Expand All @@ -43,12 +72,12 @@
#endif
namespace llvm {
#if LLVM_ENABLE_ABI_BREAKING_CHECKS
extern int EnableABIBreakingChecks;
ABI_BREAKING_EXPORT_ABI extern int EnableABIBreakingChecks;
LLVM_HIDDEN_VISIBILITY
__attribute__((weak)) int *VerifyEnableABIBreakingChecks =
&EnableABIBreakingChecks;
#else
extern int DisableABIBreakingChecks;
ABI_BREAKING_EXPORT_ABI extern int DisableABIBreakingChecks;
LLVM_HIDDEN_VISIBILITY
__attribute__((weak)) int *VerifyDisableABIBreakingChecks =
&DisableABIBreakingChecks;
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