Makefile

@@ -18,17 +18,21 @@ PREFIX ?= /usr/local
 
 MANDIR != [ $(PREFIX) = / ] && printf '/usr/share/man\n' \
 	|| printf '/share/man\n'
+SYSEXITS != printf '\043include <sysexits.h>\n' | cpp -M - | sed 's/ /\n/g' \
+	| sed -n 's/sysexits\.h//p' || printf 'include\n'
 
 CC ?= cc
 RUSTC ?= rustc
 RUSTLIBS = --extern getopt=build/o/libgetopt.rlib \
 	--extern sysexits=build/o/libsysexits.rlib \
 	--extern strerror=build/o/libstrerror.rlib
-CFLAGS += -Ibuild/include
+CFLAGS += -I$(SYSEXITS)
 
 .PHONY: all
 all: docs dj false fop hru intcmp mm npc rpn scrut str strcmp swab true
 
+# keep build/include until bindgen(1) has stdin support
+# https://github.com/rust-lang/rust-bindgen/issues/2703
 build:
 	mkdir -p build/bin build/docs build/include build/lib build/o build/test
 
@@ -61,12 +65,6 @@ docs: docs/ build
 rustlibs: build/o/libsysexits.rlib build/o/libgetopt.rlib \
 	build/o/libstrerror.rlib
 
-build/include/sysexits.h: build
-	cpp -dM -include sysexits.h /dev/null \
-			| grep '^.define EX_' >$@ \
-		|| cpp -dM -include stdlib.h include/sysexits.h.template \
-			| grep -e '^.define EX_' -e '^.define EXIT_' >$@
-
 build/o/libgetopt.rlib: build src/getopt-rs/lib.rs
 	$(RUSTC) $(RUSTFLAGS) --crate-type=lib --crate-name=getopt \
 		-o $@ src/getopt-rs/lib.rs
@@ -75,10 +73,12 @@ build/o/libstrerror.rlib: build src/strerror.rs
 	$(RUSTC) $(RUSTFLAGS) --crate-type=lib -o $@ \
 		src/strerror.rs
 
-build/o/libsysexits.rlib: build build/include/sysexits.h
-	<build/include/sysexits.h \
-		awk '{ print "pub const " $$2 ": i32 = " $$3 ";"; }' \
-		| $(RUSTC) $(RUSTFLAGS) --crate-type lib -o $@ -
+# bandage solution until bindgen(1) gets stdin support
+build/o/libsysexits.rlib: build $(SYSEXITS)sysexits.h
+	printf '\043define EXIT_FAILURE 1\n' | cat - $(SYSEXITS)sysexits.h \
+		> build/include/sysexits.h 
+	bindgen --default-macro-constant-type signed --use-core --formatter=none \
+		build/include/sysexits.h | $(RUSTC) $(RUSTFLAGS) --crate-type lib -o $@ -
 
 .PHONY: dj
 dj: build/bin/dj
@@ -137,7 +137,7 @@ build/bin/strcmp: src/strcmp.c build
 
 .PHONY: swab
 swab: build/bin/swab
-build/bin/swab: src/swab.rs build rustlibs
+build/bin/swab: src/swab.rs build build/o/libsysexits.rlib
 	$(RUSTC) $(RUSTFLAGS) --extern getopt=build/o/libgetopt.rlib \
 		--extern sysexits=build/o/libsysexits.rlib \
 		-o $@ src/swab.rs