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.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########################################################################### 22include(CheckCSourceCompiles) 23 24option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON) 25mark_as_advanced(CURL_HIDDEN_SYMBOLS) 26 27if(CURL_HIDDEN_SYMBOLS) 28 set(SUPPORTS_SYMBOL_HIDING FALSE) 29 30 if(CMAKE_C_COMPILER_ID MATCHES "Clang" AND NOT MSVC) 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}) 63elseif(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() 71else() 72 set(HIDES_CURL_PRIVATE_SYMBOLS FALSE) 73endif() 74 75set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE}) 76set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN}) 77