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

[Benoit Sigoure]

Quoting Keith Marshall <address@hidden>:
> 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?

On cygwin, with /bin/sh:
$ set -x; test -x / && { { test -x /bin/sh && test ! -f /bin/sh.exe; }
|| test !
-f /bin/sh; }; echo $?
+ test -x /
+ test -x /bin/sh
+ test '!' -f /bin/sh.exe
+ test '!' -f /bin/sh
+ echo 1
1

On MSYS, with /bin/sh:
$ set -x; test -x / && { { test -x /bin/sh && test ! -f /bin/sh.exe; }
|| test !
-f /bin/sh; }; echo $?
+ test -x /
+ test -x /bin/sh
+ test '!' -f /bin/sh.exe
+ test '!' -f /bin/sh
+ echo 1
1

Cheers,

--
Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory