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From: "Greg Kennedy (kennedy DOT greg AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Sat, 28 Nov 2020 18:41:35 -0600
Message-ID: <CAN1+P_1tsGCRndvZfSMFOcPEvCHvcunpCiffNrNDryQwwbEFpw@mail.gmail.com>
Subject: Re: GCC 10.2.0, collect2.exe error - cannot create temporary file
To: djgpp AT delorie DOT com
Content-Type: text/plain; charset="UTF-8"
Reply-To: djgpp AT delorie DOT com

Tried again with that.  mkstemps calls open() from fcntl, which is
apparently returning EACCES.  So the problem is coming from djgpp's
libc somewhere.  I will keep digging...

While adding this it occurred to me that there are a *lot* of .o files
being linked at once here, plus a couple .a with stuff inside.  I
don't know what all happens in the intervening time between the
collect2 and the pex-common calls but it's possible there is a
resource limit being hit in the meantime (open file descriptors, stack
space, memory allocation, whatever).  -flto works on smaller projects,
but not this one.

Here's the printout.  (I also tried adding a ".pex" extension in
pex-common.c but it gave the same result - the problem isn't related
to the filenames in use)

collect2.c: make_temp_file(.ctc)
Called make_temp_file(.ctc), redirecting
Called make_temp_file_with_prefix(cc, .ctc): 'c:/djgpp/tmp/ccXXXXXX.ctc' ->
  mkstemps(c:/djgpp/tmp/ccXXXXXX.ctc, 4): trying
open(c:/djgpp/tmp/ccFoBQz9.ctc, ...)
  Got new file descriptor 5
-> 'c:/djgpp/tmp/ccFoBQz9.ctc'

collect2.c: make_temp_file(.cto)
Called make_temp_file(.cto), redirecting
Called make_temp_file_with_prefix(cc, .cto): 'c:/djgpp/tmp/ccXXXXXX.cto' ->
  mkstemps(c:/djgpp/tmp/ccXXXXXX.cto, 4): trying
open(c:/djgpp/tmp/ccaD2wZ8.cto, ...)
  Got new file descriptor 5
-> 'c:/djgpp/tmp/ccaD2wZ8.cto'

pex-common.c: make_temp_file(NULL)
Called make_temp_file((null)), redirecting
Called make_temp_file_with_prefix(cc, ): 'c:/djgpp/tmp/ccXXXXXX' ->
  mkstemps(c:/djgpp/tmp/ccXXXXXX, 0): trying open(c:/djgpp/tmp/ccF27J2I, ...)
  encountered fatal error during open: : Permission denied (EACCES)
  Zeroing pattern and returning -1
-> ''
Cannot create temporary file in c:/djgpp/tmp/: Permission denied (EACCES)
Abort!
Exiting due to signal SIGABRT

On Sat, Nov 28, 2020 at 2:24 AM Eli Zaretskii (eliz AT gnu DOT org) [via
djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
>
> > From: "Greg Kennedy (kennedy DOT greg AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
> > Date: Fri, 27 Nov 2020 22:11:21 -0600
> >
> > I have added some debug print.  The problem is in pex-common.c, line
> > 109, which creates a temp file using make_temp_file(null);
> >
> > collect2.c: make_temp_file(.ctc)
> > Called make_temp_file(.ctc), redirecting
> > Called make_temp_file_with_prefix(cc, .ctc):
> > 'c:/djgpp/tmp/ccXXXXXX.ctc'-> 'c:/djgpp/tmp/ccehuQ7Q.ctc'
> > collect2.c: make_temp_file(.cto)
> > Called make_temp_file(.cto), redirecting
> > Called make_temp_file_with_prefix(cc, .cto):
> > 'c:/djgpp/tmp/ccXXXXXX.cto'-> 'c:/djgpp/tmp/ccioOw5x.cto'
> > pex-common.c: make_temp_file(NULL)
> > Called make_temp_file((null)), redirecting
> > Called make_temp_file_with_prefix(cc, ): 'c:/djgpp/tmp/ccXXXXXX'-> ''
> > Cannot create temporary file in c:/djgpp/tmp/: Permission denied (EACCES)
> > Abort!
>
> Given this trace, I think the problem is in libiberty's mkstemps,
> which is called with 'c:/djgpp/tmp/ccXXXXXX' and fails due to EACCES.
> Can you trace inside that as well?
>
> > I *think* the problem is that pex-common functions are being run "as a
> > subprocess", which may not have the same permissions as the original
> > launch process?
>
> No, that's not so.  It's collect2.exe that calls pex-common functions
> as part of its code.  And process permissions on MS-DOS have no
> meaning anyway.