| include(CheckCSourceCompiles) |
| |
| option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON) |
| mark_as_advanced(CURL_HIDDEN_SYMBOLS) |
| |
| if(CURL_HIDDEN_SYMBOLS) |
| set(SUPPORTS_SYMBOL_HIDING FALSE) |
| |
| if(CMAKE_C_COMPILER_ID MATCHES "Clang") |
| set(SUPPORTS_SYMBOL_HIDING TRUE) |
| set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))") |
| set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden") |
| elseif(CMAKE_COMPILER_IS_GNUCC) |
| if(NOT CMAKE_VERSION VERSION_LESS 2.8.10) |
| set(GCC_VERSION ${CMAKE_C_COMPILER_VERSION}) |
| else() |
| execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion |
| OUTPUT_VARIABLE GCC_VERSION) |
| endif() |
| if(NOT GCC_VERSION VERSION_LESS 3.4) |
| # note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact |
| set(SUPPORTS_SYMBOL_HIDING TRUE) |
| set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))") |
| set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden") |
| endif() |
| elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0) |
| set(SUPPORTS_SYMBOL_HIDING TRUE) |
| set(_SYMBOL_EXTERN "__global") |
| set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden") |
| elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0) |
| # note: this should probably just check for version 9.1.045 but I'm not 100% sure |
| # so let's to it the same way autotools do. |
| set(SUPPORTS_SYMBOL_HIDING TRUE) |
| set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))") |
| set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden") |
| check_c_source_compiles("#include <stdio.h> |
| int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug) |
| if(NOT _no_bug) |
| set(SUPPORTS_SYMBOL_HIDING FALSE) |
| set(_SYMBOL_EXTERN "") |
| set(_CFLAG_SYMBOLS_HIDE "") |
| endif() |
| elseif(MSVC) |
| set(SUPPORTS_SYMBOL_HIDING TRUE) |
| endif() |
| |
| set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING}) |
| elseif(MSVC) |
| if(NOT CMAKE_VERSION VERSION_LESS 3.7) |
| set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken |
| set(HIDES_CURL_PRIVATE_SYMBOLS FALSE) |
| else() |
| message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.") |
| set(HIDES_CURL_PRIVATE_SYMBOLS TRUE) |
| endif() |
| elseif() |
| set(HIDES_CURL_PRIVATE_SYMBOLS FALSE) |
| endif() |
| |
| set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE}) |
| set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN}) |