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

[Chris Johns]

Paul Eggert wrote:
> I want it to evaluate as false on platforms where 'test -x' doesn't
> work as Posix-conforming scripts would expect. 

Can we assume a chmod is present ? So on Linux:

$ set -x; touch a.out; chmod +x a.out; test -x; echo $?
+ touch a.out
+ chmod +x a.out
+ test -x
+ echo 0
0

and on MSYS:

$ set -x; touch a.out; chmod +x a.out; test -x a.out; echo $?
+ set -x
+ touch a.out
+ chmod +x a.out
+ test -x a.out
+ echo 1
1

Or is something as simple as this, first on Linux:

$ set -x; echo "test" > a.exe; test -x a.exe; echo $?
+ echo test
+ test -x a.exe
+ echo 1
1

and on MSYS:

$ set -x; echo "test" > a.exe; test -x a.exe; echo $?
+ set -x
+ echo test
+ test -x a.exe
+ echo 0
0

> I understand that MSYS
> has a problem, but I don't know that Cygwin does.  Does Cygwin have
> the problem?  If not, then the test is incorrect.

It may have the problem if the file-system is FAT32 rather than NTFS. An RTEMS 
user reported Cygwin worked once he changed from FAT32 to NTFS.

Regards
Chris