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1include(CheckCSourceCompiles)
2
3option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON)
4mark_as_advanced(CURL_HIDDEN_SYMBOLS)
5
6if(CURL_HIDDEN_SYMBOLS)
7    set(SUPPORTS_SYMBOL_HIDING FALSE)
8
9    if(CMAKE_C_COMPILER_ID MATCHES "Clang")
10        set(SUPPORTS_SYMBOL_HIDING TRUE)
11        set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
12        set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
13    elseif(CMAKE_COMPILER_IS_GNUCC)
14        if(NOT CMAKE_VERSION VERSION_LESS 2.8.10)
15            set(GCC_VERSION ${CMAKE_C_COMPILER_VERSION})
16        else()
17            execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
18                            OUTPUT_VARIABLE GCC_VERSION)
19        endif()
20        if(NOT GCC_VERSION VERSION_LESS 3.4)
21            # note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
22            set(SUPPORTS_SYMBOL_HIDING TRUE)
23            set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
24            set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
25        endif()
26    elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
27        set(SUPPORTS_SYMBOL_HIDING TRUE)
28        set(_SYMBOL_EXTERN "__global")
29        set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
30    elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
31        # note: this should probably just check for version 9.1.045 but I'm not 100% sure
32        #       so let's to it the same way autotools do.
33        set(SUPPORTS_SYMBOL_HIDING TRUE)
34        set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
35        set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
36        check_c_source_compiles("#include <stdio.h>
37            int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
38        if(NOT _no_bug)
39            set(SUPPORTS_SYMBOL_HIDING FALSE)
40            set(_SYMBOL_EXTERN "")
41            set(_CFLAG_SYMBOLS_HIDE "")
42        endif()
43    elseif(MSVC)
44        set(SUPPORTS_SYMBOL_HIDING TRUE)
45    endif()
46
47    set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
48elseif(MSVC)
49    if(NOT CMAKE_VERSION VERSION_LESS 3.7)
50        set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
51        set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
52    else()
53        message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
54        set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
55    endif()
56elseif()
57    set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
58endif()
59
60set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
61set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})
62