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Annotation of embedaddon/curl/CMake/CurlSymbolHiding.cmake, revision 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})