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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.haxx.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: 
   24: option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON)
   25: mark_as_advanced(CURL_HIDDEN_SYMBOLS)
   26: 
   27: if(CURL_HIDDEN_SYMBOLS)
   28:   set(SUPPORTS_SYMBOL_HIDING FALSE)
   29: 
   30:   if(CMAKE_C_COMPILER_ID MATCHES "Clang")
   31:     set(SUPPORTS_SYMBOL_HIDING TRUE)
   32:     set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
   33:     set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
   34:   elseif(CMAKE_COMPILER_IS_GNUCC)
   35:     if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
   36:       # note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
   37:       set(SUPPORTS_SYMBOL_HIDING TRUE)
   38:       set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
   39:       set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
   40:     endif()
   41:   elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
   42:     set(SUPPORTS_SYMBOL_HIDING TRUE)
   43:     set(_SYMBOL_EXTERN "__global")
   44:     set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
   45:   elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
   46:     # note: this should probably just check for version 9.1.045 but I'm not 100% sure
   47:     #       so let's do it the same way autotools do.
   48:     set(SUPPORTS_SYMBOL_HIDING TRUE)
   49:     set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
   50:     set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
   51:     check_c_source_compiles("#include <stdio.h>
   52:         int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
   53:     if(NOT _no_bug)
   54:       set(SUPPORTS_SYMBOL_HIDING FALSE)
   55:       set(_SYMBOL_EXTERN "")
   56:       set(_CFLAG_SYMBOLS_HIDE "")
   57:     endif()
   58:   elseif(MSVC)
   59:     set(SUPPORTS_SYMBOL_HIDING TRUE)
   60:   endif()
   61: 
   62:   set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
   63: elseif(MSVC)
   64:   if(NOT CMAKE_VERSION VERSION_LESS 3.7)
   65:     set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
   66:     set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
   67:   else()
   68:     message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
   69:     set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
   70:   endif()
   71: else()
   72:   set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
   73: endif()
   74: 
   75: set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
   76: set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})