Migrate build system to CMake

See #5895 for details.

This commit does not include CI or documentation changes.

frontends/ast/CMakeLists.txt

@@ -0,0 +1,13 @@
+yosys_core(ast
+	ast_binding.cc
+	ast_binding.h
+	ast.cc
+	ast.h
+	dpicall.cc
+	genrtlil.cc
+	simplify.cc
+	LIBRARIES
+		$<${YOSYS_ENABLE_LIBFFI}:${Dlfcn_LIBRARIES};PkgConfig::libffi>
+	REQUIRES
+		sha1
+)

frontends/ast/Makefile.inc

@@ -1,7 +0,0 @@
-
-OBJS += frontends/ast/ast.o
-OBJS += frontends/ast/simplify.o
-OBJS += frontends/ast/genrtlil.o
-OBJS += frontends/ast/dpicall.o
-OBJS += frontends/ast/ast_binding.o
-

frontends/ast/dpicall.cc

@@ -19,7 +19,7 @@
 
 #include "ast.h"
 
-#ifdef YOSYS_ENABLE_PLUGINS
+#ifdef YOSYS_ENABLE_LIBFFI
 
 #include <dlfcn.h>
 #include <ffi.h>
@@ -149,7 +149,7 @@ std::unique_ptr<AST::AstNode> AST::dpi_call(AstSrcLocType loc, const std::string
 
 YOSYS_NAMESPACE_END
 
-#else /* YOSYS_ENABLE_PLUGINS */
+#else /* YOSYS_ENABLE_LIBFFI */
 
 YOSYS_NAMESPACE_BEGIN
 
@@ -160,5 +160,5 @@ std::unique_ptr<AST::AstNode> AST::dpi_call(AstSrcLocType, const std::string&, c
 
 YOSYS_NAMESPACE_END
 
-#endif /* YOSYS_ENABLE_PLUGINS */
+#endif /* YOSYS_ENABLE_LIBFFI */