C/C++

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clang notes for a DEC C coder.

Last post by jonesd « Fri Jan 17, 2025 10:07 pm
Replies: 7
by jonesd » Tue Jan 07, 2025 7:41 am

Here's some things I've learned doing an experimental build of my pet project using clang in place of the classic DECC compiler:

Clang doesn't use...

7 Replies

5728 Views

Last post by jonesd
Fri Jan 17, 2025 10:07 pm
VMS x86-64, C++ and SMG$

Last post by joukj « Thu Jan 02, 2025 3:12 am
Replies: 7
by arne_v » Sat Dec 28, 2024 11:48 am

It seems like SMG$ are very 32 bit pointer oriented.

Which combined with C++ default of 64 bit pointers can give some interesting results.

I did...

7 Replies

4968 Views

Last post by joukj
Thu Jan 02, 2025 3:12 am
Cannot find a working socketpair example

Last post by craigberry « Sat Dec 28, 2024 5:06 pm
Replies: 4
by dvdwrite » Sat Dec 28, 2024 1:23 am

I'm trying get a working version of a c-program that uses the socketpair funtionionality.

As far as I can see is the fact that the read part does'nt...

4 Replies

3260 Views

Last post by craigberry
Sat Dec 28, 2024 5:06 pm
poll unable to access stdin on VMS

Last post by frenchie68 « Sat Dec 28, 2024 6:46 am
Replies: 19
by greg@tssolutions.com.au » Sun Aug 04, 2024 11:40 pm
1

2
The following works fine on Linux but not VMS
VSI C x86-64 V7.5-009 (GEM 50XBR) on OpenVMS x86_64 V9.2-2

#include
#include
#include
#include...
19 Replies

12489 Views

Last post by frenchie68
Sat Dec 28, 2024 6:46 am
getting a channel for a fd

Last post by arne_v « Fri Dec 27, 2024 10:53 pm
Replies: 10
by greg@tssolutions.com.au » Sat Dec 21, 2024 7:44 am
1

2
Have tried decc$get_channel() and decc$get_sdc()
Neither returns a valid channel number of stdin

any ideas?

gt
10 Replies

5986 Views

Last post by arne_v
Fri Dec 27, 2024 10:53 pm
CXX C++ V10.1-2: /MMS_DEPENDENCIES output less than ideal

Last post by sms « Wed Dec 18, 2024 2:09 pm
Replies: 5
by sms » Sat Dec 14, 2024 5:02 pm

My usual automatic dependency generation scheme (for UnRAR) has
broken down on x86_64 because of the novel format of the .MMS file
produced by this...

5 Replies

4938 Views

Last post by sms
Wed Dec 18, 2024 2:09 pm
stdlib qsort()

Last post by mike632t « Fri Dec 13, 2024 2:52 pm
Replies: 6
by mike632t » Mon Dec 09, 2024 7:29 pm

While just messing about with different sorting algorithms (mostly as an exercise in pointers) I decided to try comparing their efficiency by keeping...

6 Replies

3883 Views

Last post by mike632t
Fri Dec 13, 2024 2:52 pm
Minor surprise with C RTL in VMS 9.2-3

Last post by pustovetov « Tue Dec 10, 2024 2:16 am
Replies: 4
by jonesd » Mon Dec 09, 2024 2:17 pm

VMS 9.2-3 broke my web server (OSU 3.17), causing it to crash on startup. The issue was difficult to track down, but turned out to be a call to...

4 Replies

1236 Views

Last post by pustovetov
Tue Dec 10, 2024 2:16 am
Continuing woes when mixing C and C++ code

Last post by arne_v « Thu Dec 05, 2024 1:02 pm
Replies: 11
by mberryman » Tue Dec 03, 2024 6:51 pm
1

2
Every package I have ported to VMS that uses C++ code either contains a mix of C and C++ routines or else the C++ routines call support libraries...
11 Replies

2183 Views

Last post by arne_v
Thu Dec 05, 2024 1:02 pm
CXX and Decwindows on X86 : Runtime crash in DisplayOfScreen(screen)

Last post by joukj « Fri Nov 29, 2024 5:39 am
Replies: 2
by joukj » Wed Jun 28, 2023 10:11 am

Hi all,

If you compile with CXX and call the Decwindows DisplayOfScreen(screen) the program crashes at run time. (if compiled wit CC it works fine....

2 Replies

3036 Views

Last post by joukj
Fri Nov 29, 2024 5:39 am
Job Control on OpenVMS

Last post by joukj « Thu Nov 21, 2024 2:17 am
Replies: 9
by mythwalker » Mon Nov 18, 2024 5:07 pm

I've been attempting to port pdksh to OpenVMS.

But I am having issues reading from stdin. I've noticed that there are process mailboxes like in...

9 Replies

2398 Views

Last post by joukj
Thu Nov 21, 2024 2:17 am
problem linking c++ when compiled with 32-bit pointers

Last post by tigran.sargsyan « Tue Nov 19, 2024 8:36 am
Replies: 9
by joukj » Thu Sep 12, 2024 2:43 am

Hi all,

I use the latest field-test C++ compiler on OpenVMS 9.2-2. I encountered problems when linking a program which was compiled using 32-bit...

9 Replies

3809 Views

Last post by tigran.sargsyan
Tue Nov 19, 2024 8:36 am
does cc for x86 support asm ?

Last post by jreagan « Tue Oct 15, 2024 12:05 am
Replies: 19
by crgnz » Sat May 18, 2024 6:00 am
1

2
Sorry if this is more of a porting from unix question rather than a specific DEC C for x86 query but I'll ask anyway:

I'm trying to port this...
19 Replies

18575 Views

Last post by jreagan
Tue Oct 15, 2024 12:05 am
CXX compiler abort while building xpdf

Last post by jreagan « Wed Aug 21, 2024 10:14 am
Replies: 4
by mberryman » Tue Aug 13, 2024 11:12 am

While trying to build xpdf v3.04 I get the following error (same issue on both V9.2-2 and E9.2-3). There are no errors when building on Alpha or...

4 Replies

3503 Views

Last post by jreagan
Wed Aug 21, 2024 10:14 am
function argument declared volatile double broken

Last post by arne_v « Wed Aug 07, 2024 3:34 pm
Replies: 8
by jonesd » Thu Jun 20, 2024 7:32 pm

Some code I'm using declares a function argument with the volatile type attribute, for reasons according to the comments:

/*
** Do one step of the...

8 Replies

6206 Views

Last post by arne_v
Wed Aug 07, 2024 3:34 pm
getname() for a template device

Last post by pustovetov « Mon Aug 05, 2024 2:26 am
Replies: 1
by greg@tssolutions.com.au » Mon Aug 05, 2024 12:24 am

example
fd=open( MPA0: ,O_RDWR,0);
getname(fd, devname);
devname wil have MPA0: not the created device name.

Would be nice if it returned the...

1 Replies

2338 Views

Last post by pustovetov
Mon Aug 05, 2024 2:26 am
x86 issues with the STL vector handling

Last post by arne_v « Thu Jul 18, 2024 2:59 pm
Replies: 11
by brianreiter » Mon Jul 15, 2024 5:04 am
1

2
Not sure of the best location for this, but:

We have an app which is a mix of Pascal and C++ code. The C++ code was originally running on a PC but...
11 Replies

6187 Views

Last post by arne_v
Thu Jul 18, 2024 2:59 pm
-LOADER-E-BADSVINDX when C++ compiled with /pointer=32

Last post by brianreiter « Thu Jun 20, 2024 7:40 am
Replies: 3
by brianreiter » Wed Jun 19, 2024 10:56 am

On x86 OpenVMS I've been dealing with issues between C++ 32 and 64 bit pointers. The code we have a mishmash of C, C++ and Pascal (largely Pascal)....

3 Replies

3949 Views

Last post by brianreiter
Thu Jun 20, 2024 7:40 am
Status of POSIX semaphores and shared memory

Last post by pustovetov « Mon Jun 17, 2024 7:42 am
Replies: 5
by saprykin » Thu May 16, 2024 6:17 pm

A while ago (well, like 8 years :) ), there was a discussion about POSIX semaphores in OpenVMS Alpha. It seems to be that some progress to fix the...

5 Replies

5663 Views

Last post by pustovetov
Mon Jun 17, 2024 7:42 am
sigsetjmp/siglongjmp and open file

Last post by theoldman « Fri Jun 07, 2024 6:12 pm
Replies: 11
by theoldman » Wed May 22, 2024 2:43 pm
1

2
Overview (test program attached):

1. sigsetjmp(jmpbuf,1);
2. fopen a file
3. signal(SIGALRM,TOSTMER_TRAP);
4. copy jmpbuf to static so TOSTMER_TRAP...
11 Replies

9704 Views

Last post by theoldman
Fri Jun 07, 2024 6:12 pm
Some C++/RTL questions

Last post by jreagan « Wed Jun 05, 2024 12:08 pm
Replies: 14
by mberryman » Wed Dec 27, 2023 12:51 pm
1

2
In working on the MariaDB port, I have encountered the following issues:

The mkostemp function is documented as accepting additional flags for the...
14 Replies

16883 Views

Last post by jreagan
Wed Jun 05, 2024 12:08 pm
Missing "defined" in stdlib.h on IA64?

Last post by sms « Wed May 22, 2024 6:53 pm
Replies: 2
by sms » Wed May 22, 2024 1:21 pm

ITS $ cc /version
VSI C V7.4-001 on OpenVMS IA64 V8.4-2L3

OpenSSL 3.3.0 build failed. Simple test case:

ITS $ type stdlib_xoe.c
#define...

2 Replies

17723 Views

Last post by sms
Wed May 22, 2024 6:53 pm
XML files generation

Last post by jonebanes « Sun May 19, 2024 9:35 pm
Replies: 6
by jonebanes » Sun May 19, 2024 8:58 am

I have the need to produce an XML formatted file from what is now a sequential file produced by a COBOL program. I did some cursory search and with...

6 Replies

4957 Views

Last post by jonebanes
Sun May 19, 2024 9:35 pm
lib$establish() implemented in C++ x86

Last post by jreagan « Thu May 16, 2024 10:45 am
Replies: 1
by renek » Mon May 13, 2024 7:22 am

In the release notes of the x86 C++ compiler it says: The builtin function lib$establish() is not implemented in clang.
Will it be implemented in the...

1 Replies

4023 Views

Last post by jreagan
Thu May 16, 2024 10:45 am
Inquiry to next Clang update.

Last post by soutbarr « Sat Apr 06, 2024 8:35 am
Replies: 4
by soutbarr » Mon Mar 18, 2024 9:36 am

C++23 is fast approaching. Is there any clue when vsi Clang will catch up to the standard?

4 Replies

6628 Views

Last post by soutbarr
Sat Apr 06, 2024 8:35 am

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