Re: Reg M4

[Eric Blake]

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[adding bug-bison]

According to Prathima G on 4/2/2009 8:19 AM:
> 
> Hi ,
> 
> 
> While doing a ./configure for bison I receive the error:
> 
> checking for gm4... no
> checking for gnum4... no
> checking for m4... /bin/m4
> checking whether m4 supports frozen files... no
> configure: error: GNU M4 1.4 is required
>
> How to fix it?
>
> I'm running this on HP-UX 11.0 box and have just installed GNU m4 1.4.6

Which version of bison?  At any rate, the version of m4/m4.m4 in bison.git
is rather old, and should probably be replaced with the version from
autoconf 2.63 or newer.  The bison version suffers from the problem that
it only finds the first m4 in PATH, whether or not it is good enough.  The
autoconf version has been improved to search the entire PATH, and validate
that whichever m4 is picked is really up to the task, rather than just
relying on its position in PATH.

Meanwhile, the workaround is simple - simply install GNU m4 earlier in
your PATH, or even add a symlink gm4 that points to your fresh
installation of GNU m4.

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- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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