64 lines
2.5 KiB
CMake
64 lines
2.5 KiB
CMake
###############################################################################
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## Search a (possibly empty) list of libraries for the library required to link
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## against a given (extern C) symbol. Pass the list of libraries as variadic
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## arguments to the macro.
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##
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## Operates analogously to autoconfs AC_SEARCH_LIBS.
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##
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## If the symbol is found the variable provided will be set to the required
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## library, or cleared for no library. Sets variable_FOUND to true if the
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## symbol was discovered in some capacity (to differentiate between no library
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## required, and the symbol not being found)
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##
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## Does not work for C++ symbols.
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set(_SEARCH_LIBS_LIST_DIR ${CMAKE_CURRENT_LIST_DIR})
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macro(search_libs _variable _symbol)
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if (NOT DEFINED __search_libs_${_symbol})
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message (STATUS "searching for ${_symbol}")
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if (NOT DEFINED __search_libs_${_symbol}_lib)
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try_compile(
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__search_libs_${_symbol}
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"${CMAKE_BINARY_DIR}/CMakeTmp"
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SOURCES
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"${_SEARCH_LIBS_LIST_DIR}/search_libs.cpp"
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COMPILE_DEFINITIONS
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"-DSYMBOL=${_symbol}")
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if (__search_libs_${_symbol})
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set (__search_libs_${_symbol}_lib CACHE INTERNAL "library exposing ${_symbol}")
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else ()
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foreach (lib ${ARGN})
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if (NOT __search_libs_${_symbol})
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message (STATUS "searching for ${_symbol} in ${lib}")
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try_compile(
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__search_libs_${_symbol}
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"${CMAKE_BINARY_DIR}/CMakeTmp"
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SOURCES
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"${_SEARCH_LIBS_LIST_DIR}/search_libs.cpp"
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LINK_LIBRARIES
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"${lib}"
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COMPILE_DEFINITIONS
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"-DSYMBOL=${_symbol}")
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if (__search_libs_${_symbol})
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set (__search_libs_${_symbol}_lib ${lib} CACHE INTERNAL "library exposing ${_symbol}")
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endif ()
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endif ()
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endforeach()
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endif ()
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endif ()
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if (__search_libs_${_symbol})
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message (STATUS "searching for ${_symbol} - found")
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else ()
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message (STATUS "searching for ${_symbol} - not found")
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endif()
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endif ()
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set (${_variable}_FOUND ${__search_libs_${_symbol}})
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set (${_variable} ${__search_libs_${_symbol}_lib})
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endmacro()
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