strange buildworld failure

Benjamin Kaduk kaduk at MIT.EDU
Sat Nov 24 23:42:50 UTC 2012

On Sat, 24 Nov 2012, Garrett Cooper wrote:

> On Nov 24, 2012, at 11:48 AM, Benjamin Kaduk <kaduk at MIT.EDU> wrote:
>> On Sat, 24 Nov 2012, Nikos Vassiliadis wrote:
>>> By the way, I tried to add some debugging info with the help of make -d A
>>> or -d g2 but the amount of logging was excessive(the build was ran in a tmux
>>> terminal and the tmux process was using more CPU time than the build itself,
>>> so I canceled). What should I use with "make -d" in order to get some basic
>>> debugging? Or is there another way?
>> Most cases I know of where a parallel make fails and a serial make 
>> succeeds are due to incomplete specification of dependencies.  This can 
>> usually be chased down with just a build log, without extra debugging 
>> information.  I have only needed to resort to the make debugging 
>> outputs when doing more interesting things like custom suffix rules or 
>> using the SRCS+OBJS magic provided by the system makefiles in unusual 
>> ways.
> The more likely explanation is that one of the parallel threads died 
> because of enomem, enospc, or a number of other reasons, and it was some 
> time earlier on in the compile. Stating that it was a build dependency 
> issue is probably not a wise idea at this time as we do not have enough 
> data (logs, no -d A required) to substantiate that claim.

The point I was trying to make is that a full build log should be 
sufficient to debug; 'make -d' magic is unlikely to be necessary.
Sorry if it came out wrong.


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