1 #***************************************************************************
3 # Project ___| | | | _ \| |
5 # | (__| |_| | _ <| |___
6 # \___|\___/|_| \_\_____|
8 # Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 # This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 # KIND, either express or implied.
21 ###########################################################################
22 include(CheckCSourceCompiles)
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)
27 if(CURL_HIDDEN_SYMBOLS)
28 set(SUPPORTS_SYMBOL_HIDING FALSE)
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")
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)
54 set(SUPPORTS_SYMBOL_HIDING FALSE)
55 set(_SYMBOL_EXTERN "")
56 set(_CFLAG_SYMBOLS_HIDE "")
59 set(SUPPORTS_SYMBOL_HIDING TRUE)
62 set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
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)
68 message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
69 set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
72 set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
75 set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
76 set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})