C/C++

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CXX on X86. What is llvm.lifetime.start.p0i8?

Last post by jreagan « Fri Feb 14, 2025 8:51 am
Replies: 3
by joukj » Thu Feb 13, 2025 2:27 am

Hi

I'm trying to build a project. I use CXX & clang to compile (VSI C++ V10.1.2 on OpenVMS x86_64 V9.2-3) When I link everything I get one undefined...

3 Replies

508 Views

Last post by jreagan
Fri Feb 14, 2025 8:51 am
Problem with wchar's WCHAR_MAX definition,

Last post by arne_v « Sat Feb 08, 2025 6:46 pm
Replies: 1
by jonesd » Sat Feb 08, 2025 8:44 am

I'm try to port some code and one of files fails at the preprocessor line #if WCHAR_MAX == UINT32_MAX . which expands to #if ((__wchar_t)~0) ==...

1 Replies

265 Views

Last post by arne_v
Sat Feb 08, 2025 6:46 pm
clang inline problem

Last post by hb « Fri Feb 07, 2025 10:15 am
Replies: 8
by joukj » Tue Jan 28, 2025 9:47 am

Hi,

I noticed a problem when using inline and compiling with clang. Consider the following:

$ cxx/vers
VSI C++ V10.1-2
clang version 10.0.1...

8 Replies

90945 Views

Last post by hb
Fri Feb 07, 2025 10:15 am
SOLVED: VSI C X7.4-785 on OpenVMS V9.2-1 can't name a variable readonly.

Last post by pocketprobe « Tue Feb 04, 2025 10:03 am
Replies: 6
by pocketprobe » Mon Sep 11, 2023 11:48 pm

This one was discovered trying to build lynx on x86, and this short example triggers the issues.

#include

int main(int argc, char *argv[])
{
int...

6 Replies

17094 Views

Last post by pocketprobe
Tue Feb 04, 2025 10:03 am
Another CXX 64/32 bit problem on X86

Last post by joukj « Tue Feb 04, 2025 9:57 am

by joukj » Tue Feb 04, 2025 9:57 am

I found the following:

$ sh sys/nopro
OpenVMS V9.2-3 on node VOLTA 4-FEB-2025 15:51:41.75 Uptime 50 04:20:22
$ cxx/vers
VSI C++ V10.1-2
clang...

0 Replies

1708 Views

Last post by joukj
Tue Feb 04, 2025 9:57 am
VMS x86-64, C++ and SMG$

Last post by joukj « Tue Feb 04, 2025 1:43 am
Replies: 9
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...

9 Replies

21970 Views

Last post by joukj
Tue Feb 04, 2025 1:43 am
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

10718 Views

Last post by jonesd
Fri Jan 17, 2025 10:07 pm
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

5618 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

16583 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

9439 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

6995 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

5951 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

3147 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

5477 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

4780 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

4704 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

5928 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

22369 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

5578 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

8928 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

4198 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

9515 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

6075 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

7796 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

12921 Views

Last post by theoldman
Fri Jun 07, 2024 6:12 pm

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