GNUmakefile, fop(1): added sysexits support

GNUmakefile

@@ -20,8 +20,9 @@ CC=cc
 CFLAGS=-O3 -Lbuild/lib -idirafter include
 
 RUSTC=rustc +nightly
-RUSTCFLAGS=-Zlocation-detail=none -Copt-level=z -Ccodegen-units=1 -Cpanic=abort 
-	-Clto=y -Cstrip=symbols -Ctarget-cpu=native
+RUSTCFLAGS=-Zlocation-detail=none -Copt-level=z -Ccodegen-units=1 \
+	-Cpanic=abort -Clto=y -Cstrip=symbols -Ctarget-cpu=native \
+	--extern sysexits=build/o/libsysexits.rlib
 
 ifeq ($(CC), gcc)
 	CFLAGS=-O3 -s -Wl,-z,noseparate-code,-z,nosectionheader -flto -Lbuild/lib \
@@ -39,7 +40,7 @@ endif
 build: build_dir false intcmp scrut str strcmp true
 
 build_dir:
-	mkdir -p build/o build/lib build/bin
+	mkdir -p build/bin build/lib build/o
 
 clean:
 	rm -rf build/
@@ -56,10 +57,16 @@ test: build
 	tests/cc-compat.sh
 	tests/posix-compat.sh
 
+sysexits: build_dir
+	bindgen --default-macro-constant-type signed \
+		"$$(printf '#include <sysexits.h>\n' | cpp -M -idirafter include - \
+		| sed 's/ /\n/g' | grep sysexits.h)" \
+		| $(RUSTC) $(RUSTCFLAGS) --crate-type lib -o build/o/libsysexits.rlib -
+
 false: src/false.rs build_dir
 	$(RUSTC) $(RUSTCFLAGS) -o build/bin/false src/false.rs
 
-fop: src/fop.rs build_dir
+fop: src/fop.rs build_dir sysexits
 	$(RUSTC) $(RUSTCFLAGS) -o build/bin/fop src/fop.rs
 
 intcmp: src/intcmp.c build_dir
@@ -76,4 +83,3 @@ strcmp: src/strcmp.c build_dir
 
 true: src/true.rs build_dir
 	$(RUSTC) $(RUSTCFLAGS) -o build/bin/true src/true.rs
-