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Annotation of embedaddon/curl/CMake/CurlSymbolHiding.cmake, revision 1.1.1.1

1.1       misho       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})