linux-kernel - Re: cc1plus invoked oom-killer: gfp_mask=0x280da, order=0, oom

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Date:	Thu, 05 Nov 2009 05:08:30 +0000
From:	Dave Korn <dave.korn.cygwin@...glemail.com>
To:	Justin Mattock <justinmattock@...il.com>
CC:	Dave Korn <dave.korn.cygwin@...glemail.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	gcc@....gnu.org, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...washington.edu>
Subject: Re: cc1plus invoked oom-killer: gfp_mask=0x280da, order=0, oom_adj=0

Justin Mattock wrote:

> ==1830== Command: c++ -o jsxml.o -c -DOSTYPE="Linux2.6" -DOSARCH=Linux

  Ah, you're running it on the "c++" utility and it's reporting the stats for
that, but how it works is that "c++" (and "gcc", "g++", et al) is just a
driver, that parses the command line arguments and shells out to the actual
compiler ("cc1plus"), assembler and linker to get them to do all the work.

  If you add "-v --save-temps" to the c++ invocation, it'll show you the
separate command lines it executes for the subprograms; the first invocation
will be of cc1plus, using the -E flag to generate the preprocessed source into
a .ii file, it's the second invocation you want, the one which uses the
"-fpreprocessed" flag and names the .ii file as input, which is the one that
actually then compiles the pre-processed source into assembly.  For fuller
explanation, see the GCC wiki:

http://gcc.gnu.org/wiki/DebuggingGCC

    cheers,
      DaveK

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