Re: use execute module in m4

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According to Eric Blake on 3/3/2009 6:39 AM:
> Here's the followup patches which switch to the pipe module for esyscmd,
> nuke code rendered dead now that gnulib takes care of separating signal
> from normal exit status, then adds ./configure --with-syscmd-shell to
> allow overriding the default choice of /bin/sh (or, on Solaris,
> /usr/xpg4/bin/sh).  I've tested this on several platforms, but won't push
> to savannah until I've ported it to branch-1.6 and master.

Now ported.  I also needed this patch when using a cross-compiler under
cygwin to build a mingw executable.  Mingw likes to output argv[0] as an
absolute path, and includes \ directory separators; but with the new
configure --with-syscmd-shell option, you can use sh instead of cmd as the
shell.  Passing __program__ through syscmd falls foul of sh quoting rules
(cmd may be insane in its quoting rules, but at least it deals with \ as a
directory separator instead of an escape, making life with the
brain-damaged choice of directory separator a bit easier).

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

Eric Blake             [email protected]
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