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abi-breaking.h
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1/*===------- llvm/Config/abi-breaking.h - llvm configuration -------*- C -*-===*/
2/* */
3/* Part of the LLVM Project, under the Apache License v2.0 with LLVM */
4/* Exceptions. */
5/* See https://llvm.org/LICENSE.txt for license information. */
6/* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception */
7/* */
8/*===----------------------------------------------------------------------===*/
9
10/* This file controls the C++ ABI break introduced in LLVM public header. */
11
12#ifndef LLVM_ABI_BREAKING_CHECKS_H
13#define LLVM_ABI_BREAKING_CHECKS_H
14
15/* Define to enable checks that alter the LLVM C++ ABI */
16#define LLVM_ENABLE_ABI_BREAKING_CHECKS 0
17
18/* Define to enable reverse iteration of unordered llvm containers */
19#define LLVM_ENABLE_REVERSE_ITERATION 0
20
21/* Allow selectively disabling link-time mismatch checking so that header-only
22 ADT content from LLVM can be used without linking libSupport. */
23#if !defined(LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING) || !LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING
24
25// ABI_BREAKING_CHECKS protection: provides link-time failure when clients build
26// mismatch with LLVM
27#if defined(_MSC_VER)
28// Use pragma with MSVC
29#define LLVM_XSTR(s) LLVM_STR(s)
30#define LLVM_STR(s) #s
31#pragma detect_mismatch("LLVM_ENABLE_ABI_BREAKING_CHECKS", LLVM_XSTR(LLVM_ENABLE_ABI_BREAKING_CHECKS))
32#undef LLVM_XSTR
33#undef LLVM_STR
34#elif defined(_WIN32) || defined(__CYGWIN__) // Win32 w/o #pragma detect_mismatch
35// FIXME: Implement checks without weak.
36#elif defined(__cplusplus)
37#if !(defined(_AIX) && defined(__GNUC__) && !defined(__clang__))
38#define LLVM_HIDDEN_VISIBILITY __attribute__ ((visibility("hidden")))
39#else
40// GCC on AIX does not support visibility attributes. Symbols are not
41// exported by default on AIX.
42#define LLVM_HIDDEN_VISIBILITY
43#endif
44namespace llvm {
45#if LLVM_ENABLE_ABI_BREAKING_CHECKS
46extern int EnableABIBreakingChecks;
47LLVM_HIDDEN_VISIBILITY
48__attribute__((weak)) int *VerifyEnableABIBreakingChecks =
49 &EnableABIBreakingChecks;
50#else
51extern int DisableABIBreakingChecks;
52LLVM_HIDDEN_VISIBILITY
53__attribute__((weak)) int *VerifyDisableABIBreakingChecks =
54 &DisableABIBreakingChecks;
55#endif
56}
57#undef LLVM_HIDDEN_VISIBILITY
58#endif // _MSC_VER
59
60#endif // LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING
61
62#endif