include/llvm/Config/abi-breaking.h.cmake

   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 #cmakedefine01 LLVM_ENABLE_ABI_BREAKING_CHECKS
  17
  18 /* Define to enable reverse iteration of unordered llvm containers */
  19 #cmakedefine01 LLVM_ENABLE_REVERSE_ITERATION
  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 !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