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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