32a2af44e1
Fixes warnings (or errors, if someone injects -Werror in their build system,
which happens in fact with some folks vendoring LLVM too) with Clang 16:
```
+/var/tmp/portage.notmp/portage/sys-devel/llvm-15.0.4/work/llvm_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c:3:9: warning: a function declaration without a prototype
is deprecated in all versions of C [-Wstrict-prototypes]
-/var/tmp/portage.notmp/portage/sys-devel/llvm-14.0.4/work/llvm_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c:3:9: error: a function declaration without a prototype is
deprecated in all versions of C [-Werror,-Wstrict-prototypes]
int main() {return 0;}
^
void
```
Differential Revision: https://reviews.llvm.org/D137503
82 lines
2.5 KiB
CMake
82 lines
2.5 KiB
CMake
# 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()
|