CurlSymbolHiding.cmake 3.3 KB

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  1. #***************************************************************************
  2. # _ _ ____ _
  3. # Project ___| | | | _ \| |
  4. # / __| | | | |_) | |
  5. # | (__| |_| | _ <| |___
  6. # \___|\___/|_| \_\_____|
  7. #
  8. # Copyright (C) 1998 - 2020, 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. ###########################################################################
  22. include(CheckCSourceCompiles)
  23. option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON)
  24. mark_as_advanced(CURL_HIDDEN_SYMBOLS)
  25. if(CURL_HIDDEN_SYMBOLS)
  26. set(SUPPORTS_SYMBOL_HIDING FALSE)
  27. if(CMAKE_C_COMPILER_ID MATCHES "Clang" AND NOT MSVC)
  28. set(SUPPORTS_SYMBOL_HIDING TRUE)
  29. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  30. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  31. elseif(CMAKE_COMPILER_IS_GNUCC)
  32. if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
  33. # note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
  34. set(SUPPORTS_SYMBOL_HIDING TRUE)
  35. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  36. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  37. endif()
  38. elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
  39. set(SUPPORTS_SYMBOL_HIDING TRUE)
  40. set(_SYMBOL_EXTERN "__global")
  41. set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
  42. elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
  43. # note: this should probably just check for version 9.1.045 but I'm not 100% sure
  44. # so let's do it the same way autotools do.
  45. set(SUPPORTS_SYMBOL_HIDING TRUE)
  46. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  47. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  48. check_c_source_compiles("#include <stdio.h>
  49. int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
  50. if(NOT _no_bug)
  51. set(SUPPORTS_SYMBOL_HIDING FALSE)
  52. set(_SYMBOL_EXTERN "")
  53. set(_CFLAG_SYMBOLS_HIDE "")
  54. endif()
  55. elseif(MSVC)
  56. set(SUPPORTS_SYMBOL_HIDING TRUE)
  57. endif()
  58. set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
  59. elseif(MSVC)
  60. if(NOT CMAKE_VERSION VERSION_LESS 3.7)
  61. set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
  62. set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
  63. else()
  64. message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
  65. set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
  66. endif()
  67. else()
  68. set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
  69. endif()
  70. set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
  71. set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})