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Re: autoconf-2.61's AC_LINK_IFELSE with MinGW cross-compilers

From: Keith Marshall
Subject: Re: autoconf-2.61's AC_LINK_IFELSE with MinGW cross-compilers
Date: Sun, 1 Apr 2007 19:50:52 +0100
User-agent: KMail/1.8.2

On Sunday 01 April 2007 18:23, Paul Eggert wrote:
> For example, will this test work?  If not, why not?
>     test -x / && { { test -x /bin/sh && test ! -f /bin/sh.exe; } ||
> test ! -f /bin/sh; }

It might.  I don't have a Win32 box here, so can't verify this until I 
return to work in the morning, but I'm fairly confident that:--

  test -x /            --> true
  test -x /bin/sh      --> true, because /bin/sh.exe exists and MSYS
                           appends the registered executable file type
                           extensions, when matching bare file names
  test -f /bin/sh.exe  --> true

I'm less certain, but I also believe that:--

  test -f /bin/sh      --> true, because /bin/sh.exe exists, and causes
                           /bin/sh to *appear* to exist as an executable
                           file, although its real name is /bin/sh.exe

Thus, because of the negation in the final two tests, I would expect the 
proposed expression to evaluate as false on MSYS, and I suspect also on 
Cygwin.  Is that what you want to achieve?


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