Use gbindgen to generate a C header

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

Author: elmarco

.gitignore

@@ -6,3 +6,4 @@ Ex-0.1.typelib
 Ex-0.1.vapi
 test-c
 test-vala
+/include/

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "cbindgen"]
+	path = cbindgen
+	url = https://github.com/elmarco/cbindgen.git
+	branch = gbindgen

Makefile

@@ -1,13 +1,4 @@
-HEADERS = \
-	include/ex/ex.h \
-	include/ex/error.h \
-	include/ex/flags.h \
-	include/ex/color.h \
-	include/ex/foo.h \
-	include/ex/bar.h \
-	include/ex/nameable.h \
-	include/ex/rstring.h \
-	include/ex/shared-rstring.h \
+HEADER = include/ex/ex.h
 
 RUST_SOURCES = \
 	src/lib.rs \
@@ -45,14 +36,22 @@ export LD_LIBRARY_PATH=$(PWD)/target/debug
 target/debug/libgobject_example.so: $(RUST_SOURCES)
 	cargo build
 
-Ex-0.1.gir: target/debug/libgobject_example.so $(HEADERS)
+GBINDGEN = cbindgen/target/debug/gbindgen
+
+$(GBINDGEN):
+	cargo build --all-features --manifest-path=cbindgen/Cargo.toml
+
+$(HEADER): $(GBINDGEN) $(RUST_SOURCES)
+	$(GBINDGEN) -o $(HEADER)
+
+Ex-0.1.gir: target/debug/libgobject_example.so $(HEADER)
 	g-ir-scanner -v --warn-all \
 		--namespace Ex --nsversion=0.1 \
 		-Iinclude --c-include "ex/ex.h" \
 		--library=gobject_example --library-path=target/debug \
 		--include=GObject-2.0 -pkg gobject-2.0 \
 		--output $@ \
-		$(HEADERS)
+		$(HEADER)
 
 Ex-0.1.typelib: Ex-0.1.gir
 	g-ir-compiler \
@@ -86,7 +85,7 @@ test-vala: test.vala Ex-0.1.vapi
 run-vala: test-vala
 	./test-vala
 
-test-c: test.c target/debug/libgobject_example.so Ex-0.1.pc $(HEADERS)
+test-c: test.c target/debug/libgobject_example.so Ex-0.1.pc $(HEADER)
 	$(CC) -Wall $< `pkg-config --cflags --libs Ex-0.1` -o $@
 
 run-c: test-c