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