forked from OSchip/llvm-project
82 lines
2.5 KiB
CMake
82 lines
2.5 KiB
CMake
# Attempts to discover ffi library with a linkable ffi_call function.
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#
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# Example usage:
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#
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# find_package(FFI)
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#
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# FFI_REQUIRE_INCLUDE may be set to consider ffi found if the includes
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# are present in addition to the library. This is useful to keep off
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# for the imported package on platforms that install the library but
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# not the headers.
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#
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# FFI_LIBRARY_DIR may be set to define search paths for the ffi library.
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#
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# If successful, the following variables will be defined:
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# FFI_FOUND
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# FFI_INCLUDE_DIRS
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# FFI_LIBRARIES
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# HAVE_FFI_CALL
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#
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# HAVE_FFI_H or HAVE_FFI_FFI_H is defined depending on the ffi.h include path.
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#
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# Additionally, the following import target will be defined:
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# FFI::ffi
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find_path(FFI_INCLUDE_DIRS ffi.h PATHS ${FFI_INCLUDE_DIR})
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if( EXISTS "${FFI_INCLUDE_DIRS}/ffi.h" )
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set(FFI_HEADER ffi.h CACHE INTERNAL "")
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set(HAVE_FFI_H 1 CACHE INTERNAL "")
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else()
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find_path(FFI_INCLUDE_DIRS ffi/ffi.h PATHS ${FFI_INCLUDE_DIR})
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if( EXISTS "${FFI_INCLUDE_DIRS}/ffi/ffi.h" )
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set(FFI_HEADER ffi/ffi.h CACHE INTERNAL "")
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set(HAVE_FFI_FFI_H 1 CACHE INTERNAL "")
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endif()
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endif()
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find_library(FFI_LIBRARIES ffi PATHS ${FFI_LIBRARY_DIR})
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if(FFI_LIBRARIES)
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include(CMakePushCheckState)
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include(CheckCSourceCompiles)
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cmake_push_check_state()
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list(APPEND CMAKE_REQUIRED_LIBRARIES ${FFI_LIBRARIES})
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check_c_source_compiles("
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struct ffi_cif;
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typedef struct ffi_cif ffi_cif;
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void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue);
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int main() { ffi_call(0, 0, 0, 0); }"
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HAVE_FFI_CALL)
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cmake_pop_check_state()
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endif()
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unset(required_includes)
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if(FFI_REQUIRE_INCLUDE)
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set(required_includes FFI_INCLUDE_DIRS)
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(FFI
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FOUND_VAR
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FFI_FOUND
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REQUIRED_VARS
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FFI_LIBRARIES
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${required_includes}
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HAVE_FFI_CALL)
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mark_as_advanced(FFI_LIBRARIES
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FFI_INCLUDE_DIRS
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HAVE_FFI_CALL
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FFI_HEADER
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HAVE_FFI_H
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HAVE_FFI_FFI_H)
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if(FFI_FOUND)
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if(NOT TARGET FFI::ffi)
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add_library(FFI::ffi UNKNOWN IMPORTED)
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set_target_properties(FFI::ffi PROPERTIES IMPORTED_LOCATION "${FFI_LIBRARIES}")
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if(FFI_INCLUDE_DIRS)
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set_target_properties(FFI::ffi PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFI_INCLUDE_DIRS}")
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endif()
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endif()
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endif()
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