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computers / comp.os.vms / Re: Bug in Clang when DECC$FILE_SHARING enabled

SubjectAuthor
* Bug in Clang when DECC$FILE_SHARING enabledJake Hamby (Solid State Jake)
`- Re: Bug in Clang when DECC$FILE_SHARING enabledJohn Reagan

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Bug in Clang when DECC$FILE_SHARING enabled

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Subject: Bug in Clang when DECC$FILE_SHARING enabled
From: jake.ha...@gmail.com (Jake Hamby (Solid State Jake))
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 by: Jake Hamby (Solid St - Tue, 10 Oct 2023 19:53 UTC

While I was working on performance testing, I tried enabling all of the UNIX-related DECC$ logicals that I knew were relatively safe:

$ define/job DECC$UNIX_LEVEL 100
$ define/job DECC$EFS_CASE_SPECIAL DISABLE
$ define/job DECC$DETACHED_CHILD_PROCESS DISABLE
$ define/job DECC$POSIX_STYLE_UID DISABLE
$ define/job DECC$DISABLE_POSIX_ROOT DISABLE
$ define/job DECC$ENABLE_GETENV_CACHE ENABLE
$ define/job DECC$EXIT_AFTER_FAILED_EXEC ENABLE
$ define/job DECC$MAILBOX_CTX_STM ENABLE
$ define/job DECC$POPEN_NO_CRLF_REC_ATTR ENABLE
$ define/job DECC$ACL_ACCESS_CHECK ENABLE
$ define/job DECC$ALLOW_REMOVE_OPEN_FILES ENABLE
$ define/job DECC$STREAM_PIPE ENABLE
$ define/job DECC$UNIX_PATH_BEFORE_LOGNAME ENABLE
$ define/job DECC$POSIX_COMPLIANT_PATHNAMES ENABLE
$ define/job DECC$EXEC_FILEATTR_INHERITANCE 2
$ define/job DECC$PIPE_BUFFER_SIZE 65535
$ define/job DECC$PIPE_BUFFER_QUOTA 65536

After defining those, I discovered that Clang fails to generate the .obj file and leaves an empty ".obj.tmp" file in the directory as well:

$ clang -O3 -march=native -c ctype.cpp
CLANG: error: unable to make temporary file: unspecified generic_category error
error: unable to open output file 'ctype.obj': 'unspecified generic_category err
or'
1 error generated.

Some testing revealed that setting DECC$UNIX_LEVEL to 20 worked, but setting it to 30 fails, which led me to the culprit: DECC$FILE_SHARING. If I enable it, I get the file error, and if I set DECC$UNIX_LEVEL to 100 and then disable DECC$FILE_SHARING, I don't get the error.

Regards,
Jake Hamby

Re: Bug in Clang when DECC$FILE_SHARING enabled

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Subject: Re: Bug in Clang when DECC$FILE_SHARING enabled
From: xyzzy1...@gmail.com (John Reagan)
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 by: John Reagan - Wed, 11 Oct 2023 05:50 UTC

On Tuesday, October 10, 2023 at 12:53:36 PM UTC-7, Jake Hamby (Solid State Jake) wrote:
> While I was working on performance testing, I tried enabling all of the UNIX-related DECC$ logicals that I knew were relatively safe:
>
> $ define/job DECC$UNIX_LEVEL 100
> $ define/job DECC$EFS_CASE_SPECIAL DISABLE
> $ define/job DECC$DETACHED_CHILD_PROCESS DISABLE
> $ define/job DECC$POSIX_STYLE_UID DISABLE
> $ define/job DECC$DISABLE_POSIX_ROOT DISABLE
> $ define/job DECC$ENABLE_GETENV_CACHE ENABLE
> $ define/job DECC$EXIT_AFTER_FAILED_EXEC ENABLE
> $ define/job DECC$MAILBOX_CTX_STM ENABLE
> $ define/job DECC$POPEN_NO_CRLF_REC_ATTR ENABLE
> $ define/job DECC$ACL_ACCESS_CHECK ENABLE
> $ define/job DECC$ALLOW_REMOVE_OPEN_FILES ENABLE
> $ define/job DECC$STREAM_PIPE ENABLE
> $ define/job DECC$UNIX_PATH_BEFORE_LOGNAME ENABLE
> $ define/job DECC$POSIX_COMPLIANT_PATHNAMES ENABLE
> $ define/job DECC$EXEC_FILEATTR_INHERITANCE 2
> $ define/job DECC$PIPE_BUFFER_SIZE 65535
> $ define/job DECC$PIPE_BUFFER_QUOTA 65536
>
> After defining those, I discovered that Clang fails to generate the .obj file and leaves an empty ".obj.tmp" file in the directory as well:
>
> $ clang -O3 -march=native -c ctype.cpp
> CLANG: error: unable to make temporary file: unspecified generic_category error
> error: unable to open output file 'ctype.obj': 'unspecified generic_category err
> or'
> 1 error generated.
>
> Some testing revealed that setting DECC$UNIX_LEVEL to 20 worked, but setting it to 30 fails, which led me to the culprit: DECC$FILE_SHARING. If I enable it, I get the file error, and if I set DECC$UNIX_LEVEL to 100 and then disable DECC$FILE_SHARING, I don't get the error.
>
> Regards,
> Jake Hamby
I've passed this along to the team

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