On Mon, 2022-06-06 at 15:13 +0200, Georg Lehner wrote:
> Hi,
>
> The topic of header dependency tracking is already addressed since
> the
> inception of redo by DJB.
About C header dependencies, you can actually do it using POSIX Make
(in the next version, the -include statement is not available yet but
widely supported).
SRCS= foo.c bar.c baz.c
OBJS= ${SRCS:.c=.o}
DEPS= ${SRCS:.c=.d}
.c.o:
${CC} -o $@ -MMD -c $< ${CFLAGS}
all: hello
-include ${DEPS}
hello: ${OBJS}
${CC} -o $@ ${OBJS}
And you're done. On a fresh directory the -include ${DEPS} will
silently fail and rebuild everything. Then .d files will be generated
and touching any file will rebuild exactly what should be.
The only non portable thing is the -MMD option (gcc and clang support
though).
HTH
--
David
