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fc9312f717
- remove check for unsupported old CMake versions
- do not link to c-ares library twice
- modernize custom Find modules
- FindLibSSH2:
- pass version to FPHSA to show it in the output
- use LIBSSH2_VERSION define to extract the version number in
one shot. This variable exists in the header for 10 years.
- remove unneeded code
- FindNGHTTP2.cmake:
- drop needless FPHSA argument
- mark found variables as advanced
- FindNSS.cmake:
- show version number
- FindCARES.cmake:
- drop default paths
- use FPHSA instead of checking things by hand
- remove needless explict variable dereference
- simplify count_true()
- allow all policies up to version 3.16 to be set to NEW
- do not rerun check for -Wstrict-aliasing=3 every time
In contrast to every other compiler flag this has a = in it, which CMake
can't have in a variable name.
- only read the interesting strings from curlver.h
Reviewed-by: Peter Wu
Closes https://github.com/curl/curl/pull/4975
56 lines
2.3 KiB
CMake
56 lines
2.3 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_C_COMPILER_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 do 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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else()
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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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