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 1
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
44 namespace llvm {
45 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
46 extern int EnableABIBreakingChecks;
47 LLVM_HIDDEN_VISIBILITY
48 __attribute__((weak)) int *VerifyEnableABIBreakingChecks =
49     &EnableABIBreakingChecks;
50 #else
51 extern int DisableABIBreakingChecks;
52 LLVM_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
63