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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:	Mon, 30 Nov 2020 00:25:33 -0600
Message-ID:	<CAN1+P_1E4J8VveQkaeTt2mCsmpD1cBc+woeeKG7+CTM90B8uQA@mail.gmail.com>
Subject:	Re: GCC 10.2.0, collect2.exe error - cannot create temporary file
To:	djgpp AT delorie DOT com
Reply-To:	djgpp AT delorie DOT com

I had the idea that I could put all my .o files into a single .a
archive and attempt to build that way.  Unfortunately, -flto with
archives requires the lto-plugin to be enabled, so nothing actually
built.  I looked at the gcc-10.20 configure script and found that
DJGPP does not build the lto plugin.

  # Among non-ELF, only Windows platforms support the lto-plugin so far.
  # Build it unless LTO was explicitly disabled.
  case $target in
    *-cygwin* | *-mingw*) build_lto_plugin=$enable_lto ;;
    *) ;;
  esac

Bummer.

---

However, this did give me a way to try building with more or less .o
files on the command-line.  As I did this I found that the pex-common
call was returning an FD that *increased* for every .o I added.  For
example, here's where I put three .o files and the rest in a .a:

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/cchFW50P.ctc, ...)
Got new file descriptor 5
-> 'c:/djgpp/tmp/cchFW50P.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/ccoaJ1Rv.cto, ...)
Got new file descriptor 5
-> 'c:/djgpp/tmp/ccoaJ1Rv.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/ccYv0qDi, ...)
Got new file descriptor 9
-> 'c:/djgpp/tmp/ccYv0qDi'

(Meanwhile, just one .o file gave an FD of 7.  All objects in a .a
never actually calls this function, I guess because it isn't
involved.)

My assumption then is that I'm running out of free File Descriptors by
passing too many .o files at once.  This seems like a bug, maybe?  It
might be possible to open each .o in turn, read the contents, and then
close it, so the FDs don't run out.  Or they're not being closed until
later.  I will keep looking...

On Sun, Nov 29, 2020 at 9:23 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: Sat, 28 Nov 2020 18:41:35 -0600
> >
> > Tried again with that.  mkstemps calls open() from fcntl, which is
> > apparently returning EACCES.  So the problem is coming from djgpp's
> > libc somewhere.
>
> Yes, it sounds like that.
>
> > 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).
>
> It could be.  You can try enlarging the stack of collect2.exe, to
> eliminate that.  Given the small numbers of file descriptor (5), it
> seems unlikely that this should be the problem, but who knows...
>
> > 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)
>
> I guess the next question is: with what DOS error code does 'open'
> fail and why?

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