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RE: Problem with parallel build

From: Vardhan, Sundara (GE Energy)
Subject: RE: Problem with parallel build
Date: Thu, 21 Oct 2010 13:33:44 -0400

Hi Michael

During parallel makes if the time of the object files created and the
time archive command is run is within a second then it will fail to
include these object files. The reason I believe is due to a bug in make
rules wherein the time granularity is 1 second. Try to introduce a sleep
of 1 second before executing the archive command. 

Hope this helps.

With Regards


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Michael Ringe
Sent: Thursday, October 21, 2010 8:43 AM
To: address@hidden
Subject: Problem with parallel build

The Makefile shown below sometimes fails to build the main target
Can anyone reproduce the error and explain what's wrong or confirm it's
a bug?

All required files are in the attached .tar file. To reproduce the
error, make sure app1.o does not exist, then run "make -j2 app1"

On my machine (Intel core i5 551, openSuSE 11.3, make 3.81) make fails
after a few retries, because the link command is invoked before app1.o
is compiled.


### --- Makefile start ---
AR := ar
CC := gcc

all: app1

# Link apps
app%: app%.o lib.a
        ${CC} ${@:app%=app%.o} lib.a -o $@

# Link lib.a
LIBSRCS := a b
lib.a: ${LIBSRCS:%=%.o}
        ${AR} r $@ ${LIBSRCS:%=%.o}

# Compile
%.o: src/%.c
        $(CC) -c -o $@ $<

# Dependencies
a.o: a.c lib.h
b.o: b.c lib.h
### --- Makefile end ---

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