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AC_PROG_GNU_M4 does not reject IRIX m4

From: Ralf Wildenhues
Subject: AC_PROG_GNU_M4 does not reject IRIX m4
Date: Sun, 30 Sep 2007 20:27:58 +0200
User-agent: Mutt/1.5.13 (2006-08-11)

Hello bug-autoconf,

The current test for the trace bug in autoconf/m4/m4.m4 does not reject
IRIX 6.5 /bin/m4.  The latter accepts unknown options starting in `--',
outputs nothing for the bad trace, and exits zero.

This wouldn't itself be so bad, as `make' quickly unveils that GNU m4 is
needed, but the test happens to claim that it actually found GNU m4.


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