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CurlSymbolHiding.cmake 3.5 KB

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  1. #***************************************************************************
  2. # _ _ ____ _
  3. # Project ___| | | | _ \| |
  4. # / __| | | | |_) | |
  5. # | (__| |_| | _ <| |___
  6. # \___|\___/|_| \_\_____|
  7. #
  8. # Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
  9. #
  10. # This software is licensed as described in the file COPYING, which
  11. # you should have received as part of this distribution. The terms
  12. # are also available at https://curl.se/docs/copyright.html.
  13. #
  14. # You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15. # copies of the Software, and permit persons to whom the Software is
  16. # furnished to do so, under the terms of the COPYING file.
  17. #
  18. # This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19. # KIND, either express or implied.
  20. #
  21. # SPDX-License-Identifier: curl
  22. #
  23. ###########################################################################
  24. include(CheckCSourceCompiles)
  25. option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON)
  26. mark_as_advanced(CURL_HIDDEN_SYMBOLS)
  27. if(WIN32 AND ENABLE_CURLDEBUG)
  28. # We need to export internal debug functions (e.g. curl_dbg_*), so disable
  29. # symbol hiding for debug builds.
  30. set(CURL_HIDDEN_SYMBOLS OFF)
  31. endif()
  32. if(CURL_HIDDEN_SYMBOLS)
  33. set(SUPPORTS_SYMBOL_HIDING FALSE)
  34. if(CMAKE_C_COMPILER_ID MATCHES "Clang" AND NOT MSVC)
  35. set(SUPPORTS_SYMBOL_HIDING TRUE)
  36. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  37. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  38. elseif(CMAKE_COMPILER_IS_GNUCC)
  39. if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
  40. # note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
  41. set(SUPPORTS_SYMBOL_HIDING TRUE)
  42. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  43. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  44. endif()
  45. elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
  46. set(SUPPORTS_SYMBOL_HIDING TRUE)
  47. set(_SYMBOL_EXTERN "__global")
  48. set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
  49. elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
  50. # note: this should probably just check for version 9.1.045 but I'm not 100% sure
  51. # so let's do it the same way autotools do.
  52. set(SUPPORTS_SYMBOL_HIDING TRUE)
  53. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  54. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  55. check_c_source_compiles("#include <stdio.h>
  56. int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
  57. if(NOT _no_bug)
  58. set(SUPPORTS_SYMBOL_HIDING FALSE)
  59. set(_SYMBOL_EXTERN "")
  60. set(_CFLAG_SYMBOLS_HIDE "")
  61. endif()
  62. elseif(MSVC)
  63. set(SUPPORTS_SYMBOL_HIDING TRUE)
  64. endif()
  65. set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
  66. elseif(MSVC)
  67. if(NOT CMAKE_VERSION VERSION_LESS 3.7)
  68. set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
  69. set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
  70. else()
  71. message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
  72. set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
  73. endif()
  74. else()
  75. set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
  76. endif()
  77. set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
  78. set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})