[Bug bootstrap/31840] New: race condition in makefiles

[zadeck at naturalbridge dot com]

I have not tried this on a single core, but on 2 or more core machines, a
bootstrap will fail if you issue the following commands:

make clean
make -j4

This assumes that the bootstrap has been built at least once before the make
clean.  When it fails, it can be restarted with make -j4 and it will most times
run to conclusion.  Builds also sometimes fail going from one stage to the
next, but this may be the same problem.  

I know that this fails in at r124381 and has been doing this for at least a
week or so.  

I have not tried this on a single core machine, i do not use higher than j2 on
those and the problem does not seem to arise with j1 or j2.

my configure string is generally --enable-languages=c,c++,fortran
--disable-multilib (if appropriate)


-- 
           Summary: race condition in makefiles
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zadeck at naturalbridge dot com
 GCC build triplet: same
  GCC host triplet: ppc, x86-64, ia-32 on linux
GCC target triplet: same


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31840