CMake: enable building plugins

CMakeLists.txt

@@ -139,6 +139,13 @@ if (ENABLE_ABC)
     endif()        
 endif()
 
+if (ENABLE_PLUGINS)
+    find_package(LibFFI REQUIRED)
+    add_compile_definitions(YOSYS_ENABLE_PLUGINS)
+    include_directories(${LIBFFI_INCLUDE_DIR})
+    target_link_libraries(yosys PRIVATE ${LIBFFI_LIBRARY})
+endif()
+
 add_subdirectory(kernel)
 add_subdirectory(libs)
 

cmake/FindLibFFI.cmake

@@ -0,0 +1,86 @@
+#
+#	CMake Find Foreing Function Interface library by Parra Studios
+#	CMake script to find FFI library.
+#
+#	Copyright (C) 2016 - 2024 Vicente Eduardo Ferrer Garcia <vic798@gmail.com>
+#
+#	Licensed under the Apache License, Version 2.0 (the "License");
+#	you may not use this file except in compliance with the License.
+#	You may obtain a copy of the License at
+#
+#		http://www.apache.org/licenses/LICENSE-2.0
+#
+#	Unless required by applicable law or agreed to in writing, software
+#	distributed under the License is distributed on an "AS IS" BASIS,
+#	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#	See the License for the specific language governing permissions and
+#	limitations under the License.
+#
+
+# Find FFI library and include paths
+#
+# LIBFFI_FOUND - True if FFI library was found
+# LIBFFI_INCLUDE_DIR - FFI headers path
+# LIBFFI_LIBRARY - List of FFI libraries
+
+# Prevent vervosity if already included
+if(LIBFFI_INCLUDE_DIRS)
+	set(LIBFFI_FIND_QUITELY TRUE)
+endif()
+
+include(FindPackageHandleStandardArgs)
+
+set(LIBFFI_SUFFIXES
+	ffi
+	x86_64-linux-gnu
+	aarch64-linux-gnu
+	arm-linux-gnueabi
+	arm-linux-gnueabihf
+	i386-linux-gnu
+	mips64el-linux-gnuabi64
+	mipsel-linux-gnu
+	powerpc64le-linux-gnu
+	s390x-linux-gnu
+)
+
+find_library(LIBFFI_LIBRARY
+	NAMES ffi libffi
+	PATHS /usr /usr/lib /usr/local /opt/local
+	PATH_SUFFIXES lib lib64 ${LIBFFI_SUFFIXES}
+)
+
+if(APPLE)
+	execute_process(COMMAND brew --prefix libffi OUTPUT_VARIABLE LIBFFI_PREFIXES)
+else()
+	# TODO: Windows?
+	set(LIBFFI_PREFIXES)
+endif()
+
+if(NOT LIBFFI_INCLUDE_DIR)
+	find_path(LIBFFI_INCLUDE_DIR ffi.h
+		PATHS /usr /usr/include /usr/local /opt/local /usr/include/ffi
+		PATH_SUFFIXES ${LIBFFI_SUFFIXES}
+		HINT LIBFFI_PREFIXES
+	)
+endif()
+
+# Try to load by using PkgConfig
+if(NOT LIBFFI_LIBRARY OR NOT LIBFFI_INCLUDE_DIR)
+	# Find package configuration module
+	find_package(PkgConfig)
+
+	# Find module
+	pkg_check_modules(PC_LIBFFI QUIET libffi)
+
+	# Find include path
+	find_path(LIBFFI_INCLUDE_DIR ffi.h HINTS ${PC_LIBFFI_INCLUDEDIR} ${PC_LIBFFI_INCLUDE_DIRS})
+
+	# Find library
+	find_library(LIBFFI_LIBRARY NAMES ffi HINTS ${PC_LIBFFI_LIBDIR} ${PC_LIBFFI_LIBRARY_DIRS})
+endif()
+
+# Define FFI cmake module
+find_package_handle_standard_args(LibFFI DEFAULT_MSG LIBFFI_LIBRARY LIBFFI_INCLUDE_DIR)
+
+# Mark cmake module as advanced
+mark_as_advanced(LIBFFI_INCLUDE_DIR LIBFFI_LIBRARY)