85 lines
3.5 KiB
CMake
85 lines
3.5 KiB
CMake
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#***************************************************************************
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# _ _ ____ _
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# Project ___| | | | _ \| |
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# / __| | | | |_) | |
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# | (__| |_| | _ <| |___
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# \___|\___/|_| \_\_____|
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#
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# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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#
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# This software is licensed as described in the file COPYING, which
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# you should have received as part of this distribution. The terms
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# are also available at https://curl.se/docs/copyright.html.
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#
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# You may opt to use, copy, modify, merge, publish, distribute and/or sell
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# copies of the Software, and permit persons to whom the Software is
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# furnished to do so, under the terms of the COPYING file.
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#
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# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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# KIND, either express or implied.
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#
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# SPDX-License-Identifier: curl
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#
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###########################################################################
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include(CheckCSourceCompiles)
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option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON)
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mark_as_advanced(CURL_HIDDEN_SYMBOLS)
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if(WIN32 AND ENABLE_CURLDEBUG)
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# We need to export internal debug functions (e.g. curl_dbg_*), so disable
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# symbol hiding for debug builds.
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set(CURL_HIDDEN_SYMBOLS OFF)
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endif()
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if(CURL_HIDDEN_SYMBOLS)
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set(SUPPORTS_SYMBOL_HIDING FALSE)
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if(CMAKE_C_COMPILER_ID MATCHES "Clang" AND NOT MSVC)
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
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set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
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elseif(CMAKE_COMPILER_IS_GNUCC)
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if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
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# note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
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set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
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endif()
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elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__global")
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set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
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elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
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# note: this should probably just check for version 9.1.045 but I'm not 100% sure
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# so let's do it the same way autotools do.
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
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set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
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check_c_source_compiles("#include <stdio.h>
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int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
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if(NOT _no_bug)
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set(SUPPORTS_SYMBOL_HIDING FALSE)
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set(_SYMBOL_EXTERN "")
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set(_CFLAG_SYMBOLS_HIDE "")
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endif()
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elseif(MSVC)
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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endif()
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set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
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elseif(MSVC)
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if(NOT CMAKE_VERSION VERSION_LESS 3.7)
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set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
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set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
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else()
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message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
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set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
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endif()
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else()
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set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
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endif()
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set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
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set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})
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