gmake && file time precision of 1 second

[Matthias Apitz]

Hello,

I have a large project where a shell script fires up
gmake runs in subdirs as:

for dir in src norm print ....; do 
   cd $dir
   gmake
   cd ..
done

in each subdir *.c are compiled to *.o and the resulting *.o are ar'ed
into all the same lib.a; based on normal Makefile rules like:

SRCS = f1.c f2.c
OBJS = $(SRCS:.c=.o)

.c.o:
	$(CC) -c ... $*.c

lib.a:: $(OBJS)
	$(AR) $@ $(OBJS)


after moving to a faster server it turned out that gmake sometimes forget
to ar the *.o into the lib; I investigated it and it turned out that the
*.o files have the same modification time (in seconds) as the target
lib.a (which was produced/updated in the last directory worked on) and
gmake thinks that the lib.a is uptodate.

Any idea how to address this in the Makefiles?

Well I could place (and it works) a 'sleep 1' into the loop, but I think
that there is some better way.

Thx

	matthias
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