Date: Mon, 13 Oct 2014 22:06:14 +1000 From: Tristan Verniquet <tris_vern@hotmail.com> To: Matthias Apitz <guru@unixarea.de>, freebsd hackers <freebsd-hackers@freebsd.org> Subject: RE: gmake && file time precision of 1 second Message-ID: <BAY169-W12841CCA40C26465BA6E6083AC0@phx.gbl> In-Reply-To: <20141013092018.GA2737@unixarea.DDR.dd> References: <20141013092018.GA2737@unixarea.DDR.dd>
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We have this problem too using recursive make and I am interested in what other solutions there are. Currently we sleep until the start of the next second using a custom binary, but it does slow down the build. Another thing I've tried though haven't put much thought into is touching the lib file -1 second after each ar command. Tristan > Date: Mon, 13 Oct 2014 11:20:18 +0200 > From: guru@unixarea.de > To: freebsd-hackers@freebsd.org > Subject: gmake && file time precision of 1 second > > > 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 > -- > Matthias Apitz | /"\ ASCII Ribbon Campaign: > E-mail: guru@unixarea.de | \ / - No HTML/RTF in E-mail > WWW: http://www.unixarea.de/ | X - No proprietary attachments > phone: +49-170-4527211 | / \ - Respect for open standards > | en.wikipedia.org/wiki/ASCII_Ribbon_Campaign > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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