42595d34bd
Extend `FindFFI.cmake` to include the paths obtained from pkg-config when searching for libffi. This is going to help systems where libffi is installed in nonstandard directory such as Gentoo, saving us from having to copy the paths from pkg-config to `FFI_*` variables explicitly. The logic is inspired by `FindLibEdit.cmake`.
107 lines
3.5 KiB
CMake
107 lines
3.5 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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# FFI_STATIC_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_package(PkgConfig QUIET)
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pkg_check_modules(PC_LIBFFI QUIET libffi)
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find_path(FFI_INCLUDE_DIRS ffi.h PATHS ${FFI_INCLUDE_DIR} ${PC_LIBFFI_INCLUDE_DIRS})
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if( EXISTS "${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 NAMES ffi PATHS ${FFI_LIBRARY_DIR} ${PC_LIBFFI_LIBRARY_DIRS})
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find_library(FFI_STATIC_LIBRARIES NAMES libffi.a PATHS ${FFI_LIBRARY_DIR} ${PC_LIBFFI_LIBRARY_DIRS})
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if(FFI_LIBRARIES)
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include(CMakePushCheckState)
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cmake_push_check_state()
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list(APPEND CMAKE_REQUIRED_LIBRARIES ${FFI_LIBRARIES})
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set(HAVE_FFI_CALL_SRC [=[
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct ffi_cif;
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typedef struct ffi_cif ffi_cif;
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void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue);
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#ifdef __cplusplus
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}
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#endif
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int main(void) { ffi_call(0, 0, 0, 0); }
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]=])
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if(DEFINED CMAKE_C_COMPILER)
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include(CheckCSourceCompiles)
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check_c_source_compiles("${HAVE_FFI_CALL_SRC}" HAVE_FFI_CALL)
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else()
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include(CheckCXXSourceCompiles)
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check_cxx_source_compiles("${HAVE_FFI_CALL_SRC}" HAVE_FFI_CALL)
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endif()
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cmake_pop_check_state()
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endif()
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unset(required_includes)
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if(FFI_REQUIRE_INCLUDE)
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set(required_includes FFI_INCLUDE_DIRS)
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(FFI
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FOUND_VAR
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FFI_FOUND
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REQUIRED_VARS
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FFI_LIBRARIES
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${required_includes}
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HAVE_FFI_CALL)
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mark_as_advanced(FFI_LIBRARIES
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FFI_STATIC_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 AND FFI_LIBRARIES)
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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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if(NOT TARGET FFI::ffi_static AND FFI_STATIC_LIBRARIES)
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add_library(FFI::ffi_static UNKNOWN IMPORTED)
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set_target_properties(FFI::ffi_static PROPERTIES IMPORTED_LOCATION "${FFI_STATIC_LIBRARIES}")
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if(FFI_INCLUDE_DIRS)
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set_target_properties(FFI::ffi_static PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${FFI_INCLUDE_DIRS}")
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endif()
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endif()
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endif()
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