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https://github.com/moparisthebest/curl
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6140dfcf3e
Detect support for compiler symbol visibility flags and apply those according to CURL_HIDDEN_SYMBOLS option. It should work true to the autotools build except it tries to unhide symbols on Windows when requested and prints warning if it fails. Ref: https://github.com/curl/curl/issues/981#issuecomment-242665951 Reported-by: Daniel Stenberg
62 lines
2.7 KiB
CMake
62 lines
2.7 KiB
CMake
include(CheckCSourceCompiles)
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option(CURL_HIDDEN_SYMBOLS "Set to ON to hide libcurl internal symbols (=hide all symbols that aren't officially external)." ON)
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mark_as_advanced(CURL_HIDDEN_SYMBOLS)
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if(CURL_HIDDEN_SYMBOLS)
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set(SUPPORTS_SYMBOL_HIDING FALSE)
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if(CMAKE_C_COMPILER_ID MATCHES "Clang")
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
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set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
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elseif(CMAKE_COMPILER_IS_GNUCC)
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if(NOT CMAKE_VERSION VERSION_LESS 2.8.10)
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set(GCC_VERSION ${CMAKE_C_COMPILER_VERSION})
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else()
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execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
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OUTPUT_VARIABLE GCC_VERSION)
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endif()
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if(NOT GCC_VERSION VERSION_LESS 3.4)
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# note: this is considered buggy prior to 4.0 but the autotools don't care, so let's ignore that fact
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
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set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
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endif()
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elseif(CMAKE_C_COMPILER_ID MATCHES "SunPro" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 8.0)
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__global")
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set(_CFLAG_SYMBOLS_HIDE "-xldscope=hidden")
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elseif(CMAKE_C_COMPILER_ID MATCHES "Intel" AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 9.0)
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# note: this should probably just check for version 9.1.045 but I'm not 100% sure
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# so let's to it the same way autotools do.
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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set(_SYMBOL_EXTERN "__attribute__ ((__visibility__ (\"default\")))")
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set(_CFLAG_SYMBOLS_HIDE "-fvisibility=hidden")
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check_c_source_compiles("#include <stdio.h>
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int main (void) { printf(\"icc fvisibility bug test\"); return 0; }" _no_bug)
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if(NOT _no_bug)
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set(SUPPORTS_SYMBOL_HIDING FALSE)
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set(_SYMBOL_EXTERN "")
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set(_CFLAG_SYMBOLS_HIDE "")
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endif()
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elseif(MSVC)
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set(SUPPORTS_SYMBOL_HIDING TRUE)
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endif()
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set(HIDES_CURL_PRIVATE_SYMBOLS ${SUPPORTS_SYMBOL_HIDING})
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elseif(MSVC)
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if(NOT CMAKE_VERSION VERSION_LESS 3.7)
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set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE) #present since 3.4.3 but broken
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set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
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else()
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message(WARNING "Hiding private symbols regardless CURL_HIDDEN_SYMBOLS being disabled.")
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set(HIDES_CURL_PRIVATE_SYMBOLS TRUE)
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endif()
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elseif()
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set(HIDES_CURL_PRIVATE_SYMBOLS FALSE)
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endif()
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set(CURL_CFLAG_SYMBOLS_HIDE ${_CFLAG_SYMBOLS_HIDE})
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set(CURL_EXTERN_SYMBOL ${_SYMBOL_EXTERN})
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