build system: Initial cmake support, work in progress

components/expat/CMakeLists.txt

@@ -0,0 +1,14 @@
+set(COMPONENT_ADD_INCLUDEDIRS port/include include/expat)
+
+set(COMPONENT_SRCDIRS library port)
+
+register_component()
+
+target_compile_definitions(expat PRIVATE HAVE_EXPAT_CONFIG_H)
+
+# patch around warnings in third-party files
+set_source_files_properties(
+  library/xmlparse.c
+  PROPERTIES COMPILE_FLAGS
+  -Wno-unused-function
+  )