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# 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(void) { 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()
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