[patch] Allow build to specify what sed mkheaders uses

[Paolo Bonzini]

On 08/28/2009 01:32 AM, Steve Ellcey wrote:
> I did a bit more checking, it looks like if I run configure directly in
> the fixincludes directory with 'SED=/usr/bin/sed' as an argument on the
> configure line then I do use that SED command.  Previously what I was
> doing was putting 'SED=/usr/bin/sed' on the top-level GCC configure
> command.  It looks like that does not get passed down to the fixincludes
> configure script and so fixincludes then does not use /usr/bin/sed.  If
> I do 'export SED=/usr/bin/sed' before calling the top-level configure
> script, then fixincludes will use /usr/bin/sed.  So the issue may not be
> AC_PROG_SED but in how the top-level GCC configure calls
> sub-configure's.  Maybe we need to add SED to the list of variables
> exported from the top-level GCC Makefile.

Yes, that would be a very small patch in Makefile.tpl, plus adding 
AC_PROG_SED to the toplevel configure.ac.

Can you test this?

Paolo
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