[Bug middle-end/81443] gcc-7.1.0/MIPS N32: build/genrecog.o: virtual memory exhausted: Cannot allocate memory

[kumba at gentoo dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81443

--- Comment #9 from Joshua Kinard <kumba at gentoo dot org> ---
(In reply to Eric Botcazou from comment #8)
> > FWIW, reversing PR59461 (some manual edits required) on gcc-7_1_0-release
> > compiles cleanly, which is the first time that's happened on this machine
> > under N32.  Successful builds on this machine take about 8 hours.  Fail
> > builds....~3-4 hours.  It's during stage2-bubble when compiling genrecog.c
> > will bail out, claiming no more virtual memory (2GB RAM + 3GB of swap).
> 
> Can you invoke the problematic command manually and add -save-temps to it? 
> This will give you a .i file, then gzip it and attach it to the PR.

Yup, I'll attach that in a moment.  I also have the 'genrecog.s' file, if
needed.  I'll also add that it takes the command about 20-25mins to fail, which
is very abnormal.  This machine might be old, but the CPUs are 600MHz, and they
can still chew through some of the largest C/C++ source files in under a minute
in most cases.  So it seems like something in the stage2-bubble xgcc/xg++ gets
stuck in a loop and consumes additional memory with each iteration until it
hits some kind of boundary and bails.