Hi Paul,
The ar option `U` works on debian 12 unstable.
Thanks.
```
ARFLAGS = rvU
(%) : % ;
%.a : ; $(AR) $(ARFLAGS) $@ $?
libfoo.a: libfoo.a($(patsubst %.c,%.o,$(wildcard *.c)))
```
$ ar --version
GNU ar (GNU Binutils for Debian) 2.43.50.20241221
$
On Fri, 2024-12-27 at 17:03 +0800, lijh8 wrote:
> but if i use ` a(m) ` syntax in the prerequisites,
> it rebuilds the archive even i did not change the `*.c` source files
> or the `*.o` object files.
You didn't give us any indication of your operating system or
distribution, or what version of a
Hi community,
```
# gnu make 11.3 ,
# https://www.gnu.org/software/make/manual/make.html#Archive-Pitfalls ,
# Makefile
(%) : % ;
%.a : ; $(AR) $(ARFLAGS) $@ $?
# libfoo.a: libfoo.a($(patsubst %.c,%.o,$(wildcard *.c)))
libfoo.a: $(patsubst %.c,%.o,$(wildcard *.c))
```
if i do not use ` a(m) ` s
