m4 1.4.17 does not build on sparc on Debian unstable

[Santiago Vila]

Build log says:

[...]
Checking ./stackovf.test
Stack soft limit set to 300K
Failure - m4 aborted unexpectedly
Output from m4:
m4: internal error detected; please report this bug to <address@hidden>: 
Segmentation fault

Complete build log here:

https://buildd.debian.org/status/fetch.php?pkg=m4&arch=sparc&ver=1.4.17-1&stamp=1382635074

The build was attempted on two different sparc systems running Debian unstable:

https://buildd.debian.org/status/logs.php?pkg=m4&ver=1.4.17-1&arch=sparc

I know there is a small chance that this is really a bug in the kernel
or a bug in libc, but the error message says "report this to address@hidden",
so this is the bug report that you requested.

Thanks.