Cygwin 3.5.1: unable to open output file '/cygdrive/t/tmpdir/x-01564d.o': 'Operation not permitted'

[Cedric Blancher]

On Fri, 8 Mar 2024 at 03:25, Dan Shelton via Cygwin <cygwin@cygwin.com> wrote:
>
> Hello!
>
> I've run into a problem with clang on Cygwin 3.5.1 and 3.6. My machine
> does not have much disk space left, so I switched TMPDIR to the
> network drive. But clang then failed, like this:
>
> $ cat x.c
> #include <stdio.h>
> int main(int ac, char *av[]) { puts("hello world"); return 0 ; }
> $ mkdir /cygdrive/t/tmpdir
> $ TMPDIR=/cygdrive/t/tmpdir clang x.c
> error: unable to open output file '/cygdrive/t/tmpdir/x-01564d.o':
>       'Operation not permitted'
> 1 error generated.
>
> /cygdrive/t/tmpdir/ is a clean dir.
> /usr/bin/touch /cygdrive/t/tmpdir/dummy works without problems

I can confirm the bug, but only for the clang version linked to
Cygwin. clang version of MinGW does not show that error, so this looks
like a Cygwin bug.

Ced
-- 
Cedric Blancher <cedric.blancher@gmail.com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur