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Re: Fw: bug in texi2dvi, and hack patch

From: Stepan Kasal
Subject: Re: Fw: bug in texi2dvi, and hack patch
Date: Thu, 20 Jan 2005 12:35:08 +0100
User-agent: Mutt/1.4.1i


On Wed, Jan 19, 2005 at 08:16:51PM +0200, Eli Zaretskii wrote:
> > CVS Autoconf also tackled this issue, see
> >
> Unless I'm missing something, the above message from autoconf-patches
> does not solve this problem, since "test -f tex && test -x tex" will
> fail due to the absence of a file named literally `tex'.

(I wrote the above patch.)
The trick is that AC_CHECK_PROG contains the following code:

for ac_exec_ext in '' $ac_executable_extensions; do
  if AS_EXECUTABLE_P(["$as_dir/$ac_word$ac_exec_ext"]); then

thus we eventually get to

        test -f tex.exe && test -x tex.exe

which succeeds.

> Therefore, "test -x tex" was modified to check for
> `tex.exe' if `tex' does not exist.

Using `test -x' alone has always the danger that you encounter a directory.

Perhaps texi2dvi could use

        test -x tex && ! test -d tex

(Autoconf couldn't use this because of possible portability fears.)


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