Subject:
Re: CLD symbol table object on Itanium
From:
hoff@hp.nospam (Hoff Hoffman)
Date:
Fri, 25 Mar 2005 22:05:24 GMT
Newsgroups:
comp.os.vms

In article <00A414B5.06C91059@SendSpamHere.ORG>, VAXman-  @SendSpamHere.ORG writes:

:So how are you supposed to use CLD symbol tables on Itanium?  The linker
:balks at them when I try to link.

  A chunk of code around was playing fast-n-loose with the externals for
  command tables, and it got caught -- what was once an effectively
  identical external reference can now differ; routine references not
  necessarily the same as structure references.  A bogus external 
  reference to the command tables can lead to the CLI callback error:

    %CLI-E-INVTAB, command tables have invalid format - see documentation

  In some of the OpenVMS VAX and OpenVMS Alpha code I've seen, the command
  definition file reference was erroneously declared as a routine pointer,
  and the success of that syntax was actually somewhat of a fluke.

  Here's what was used in some of the Bliss I've seen:

    EXTERNAL ROUTINE cmdtbl;

  and that should be coded (for all OpenVMS platforms) as:

    EXTERNAL cmdtbl;

  In C, something like the following should typically be used:

    extern void *cmdtbl;

  In Fortran, external is a routine declaration, and what you need
  here is an attributes extern and something like the following:

                integer cmdtbl
    cDEC$ attributes extern :: cmdtbl

	--

  As for C references for lib$table_parse state table and key table
  references, here is what I am using -- though the void shown above
  can and does also work -- to force the external reference processing
  with C pragmas:

#pragma extern_model save
#pragma extern_model strict_refdef
extern unsigned int mumble$STATE_fratz, mumble$KEY_fratz;
#pragma extern_model restore


	--

  And for C references for cli$dcl_parse, here is what I am using:


..
extern void *mumble$$CLI_TABLES;
..

  Do remember you need to use `&mumble$$CLI_TABLES' to reference the
  external symbol in the cli$dcl_parse call; you need to pass it by
  reference.


	--

  Here are a couple of references to the error I've located:

    http://h71000.www7.hp.com/wizardi64/wizi64_0009.html
    http://h71000.www7.hp.com/DOC/82final/6673/6673pro_003.html

  The latter is the porting manual.

  I can probably dredge up a few other references.


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        Hoff (Stephen) Hoffman   OpenVMS Engineering   hoff[at]hp.com