[bug #28134] inconsistent reporting of linux kernel builds with -j2

[Phil Carmody]

URL:
  <http://savannah.gnu.org/bugs/?28134>

                 Summary: inconsistent reporting of linux kernel builds with
-j2
                 Project: make
            Submitted by: fatphil
            Submitted on: Mon 30 Nov 2009 06:39:48 PM GMT
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 3.81
        Operating System: POSIX-Based
           Fixed Release: None
           Triage Status: None

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Details:

This only seems to happen with both parallel builds and with 'sparse'
checking (C=1 or C=2). However, it's almost 100% reproducable. The actual
build itself seems correct, it's just that stdout and stderr don't tell the
whole story about what's being built.

I did make mrproper and a make defconfig to ensure that the system was in an
identical test for two builds. (A ls -lR proves that both builds were in an
identical clean state.)

Then I used the following command:
make ARCH=arm CROSS_COMPILE=arm-linux- -j2 C=1 V=2 >/tmp/C_out 2>/tmp/C_err

(The V=2 is unnecessary, it just adds more info to the output)
Again I grabbed an ls -lR, cleaned, and made again, capturing stdout and
stderr to new files. 

I sorted the _out files, and then ran diff:
<pre>
$ diff /tmp/[CD]s_out
872d871
<   CC [M]  net/mac80211/ibss.o - due to target missing
972d970
<   CC      net/ipv4/tcp_timer.o - due to target missing
1294d1291
<   CHECK   drivers/mmc/card/queue.c - due to target missing
1902c1899
<   CHECK   net/ipv4/tcp_timer.c - due to target missing
---
>   CHECK   net/ipv4/tcp_timer.c - due to target missing  CC     
net/ipv4/tcp_timer.o - due to target missing
</pre>

As you can see - some output (tcp_timer) is mangled, and some files seem to
not be CC'd (ibss.o) or CHECK'ed (queue.c).

However, looking at the final ls -lR, all of the required targets have been
build correctly. So for example, ibss.o exists both times.

For my sins, I'm using Ubuntu 9.04 on an Intel Core2Duo system.




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