CurlSymbolHiding.cmake 3.3 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778
  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(CURL_HIDDEN_SYMBOLS)
  28. set(SUPPORTS_SYMBOL_HIDING FALSE)
  29. if(CMAKE_C_COMPILER_ID MATCHES "Clang" AND NOT MSVC)
  30. set(SUPPORTS_SYMBOL_HIDING TRUE)
  31. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  32. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  33. elseif(CMAKE_COMPILER_IS_GNUCC)
  34. if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
  35. # note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
  36. set(SUPPORTS_SYMBOL_HIDING TRUE)
  37. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  38. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  39. endif()
  40. elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
  41. set(SUPPORTS_SYMBOL_HIDING TRUE)
  42. set(_SYMBOL_EXTERN "__global")
  43. set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
  44. elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
  45. # note: this should probably just check for version 9.1.045 but I'm not 100% sure
  46. # so let's do it the same way autotools do.
  47. set(SUPPORTS_SYMBOL_HIDING TRUE)
  48. set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
  49. set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
  50. check_c_source_compiles("#include <stdio.h>
  51. int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
  52. if(NOT _no_bug)
  53. set(SUPPORTS_SYMBOL_HIDING FALSE)
  54. set(_SYMBOL_EXTERN "")
  55. set(_CFLAG_SYMBOLS_HIDE "")
  56. endif()
  57. elseif(MSVC)
  58. set(SUPPORTS_SYMBOL_HIDING TRUE)
  59. endif()
  60. set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
  61. elseif(MSVC)
  62. if(NOT CMAKE_VERSION VERSION_LESS 3.7)
  63. set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
  64. set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
  65. else()
  66. message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
  67. set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
  68. endif()
  69. else()
  70. set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
  71. endif()
  72. set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
  73. set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})