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Conference turris::vaxc

Title:	VAX C Notes
Notice:	READ 1.* BEFORE WRITING; USE KEYWORDS TO FIND EXISTING NOTES
Moderator:	DECC::VMCCUTCHEON

Created:	Sat Jan 25 1986
Last Modified:	Mon Jun 02 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5611
Total number of notes:	27963

5607.0. "help on linking " by THYCO::BAGNASCO (De Consolatione Philosophiae) Fri May 02 1997 08:57

    Hi,
    
    a customer running VAXC V3.0 on VMS VAX V5.2 (an upgrade is not
    possible) need to use mktime and I'm going to give him the source 
    from note 2957.6 , to solve the coding problem he has.
    
    I should suggest to use it simply doing an:
    
    #include <sys$library:mktime.c>
    
    in any source that refers to mktime.
    
    This works, but the customer has may sources that will have to be
    modified, so this way can take a lot of time.
    
    On the other side,trying to link the original source with a command
    like:
    $link souce,mktime,sys$input/opt
    sys$share:vaxcrtl/share
    ^Z
    I get the following error:
    
    %LINK-W-NUDFSYMS, 1 undefined symbol:
    %LINK-I-UDFSYM,         MKTIME
    %LINK-W-USEUNDEF, undefined symbol MKTIME referenced
            in psect $CODE offset %X00000026
            in module NEW_ASCTIME file DUB7:[DELTA.PROVE]NEW_ASCTIME.OBJ;6
    
    That  disappear removing the static attribute in the first line of the 
    routine:
    
    static time_t mktime( timeptr );
    
    Could someone tell me if  "static" can be removed
    without create problems to the routine (since it seems to work, I 
    don't understand why it was used) or if there is a better way to link?
    
    Thanks in advance and excuse me for doing obvious questions, 
    I've not good skills on C,
    paolo

T.R	Title	User	Personal Name	Date	Lines
5607.1		TLE::D_SMITH	Duane Smith -- DEC C RTL	`Fri May 02 1997 10:35`	8
	Why not create a new object library like: $ LIBRARY/CREATE/OBJECT VAXCRTL_EXTENSIONS $ CC MKTIME $ LIBRARY VAXCRTL_EXTENSIONS MKTIME $ DEFINE LNK$LIBRARY VAXCRTL_EXTENSIONS And then proceed to link as normal.
5607.2	Don't Alias Standard Functions/Modules Directly...	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Fri May 02 1997 11:27`	13
	I would recommend avoiding the use of the C standard routine names and the standard C header file names for non-DIGITAL code (beyond possibly inserting a stub for mktime.h, if that is missing from the antique version of VAX C in use), and I would avoid modifying the standard libraries -- use application-specific (local) variants and application-specific libraries (or shareables), and I would use a site-specific pre-processor #define to redirect the mktime routine call to the my_own_mktime routine. The result of this work will tend to avoid any really weird problems when these folks finally decide that an OpenVMS and DEC C upgrade is possible.
5607.3	no yet working...	THYCO::BAGNASCO	De Consolatione Philosophiae	`Fri May 02 1997 11:37`	24
	Hi, thanks for your quick answers ! re .1 I create the library, insert the .OBJ and the link defining the logical lnk$library, as: @define lnk$library dub7:[test]vaxcrtl_extensions but it continue to return the error: and then link with: $ link new_asc %LINK-W-NUDFSYMS, 1 undefined symbol: %LINK-I-UDFSYM, MKTIME %LINK-W-USEUNDEF, undefined symbol MKTIME referenced in psect $CODE offset %X00000026 in module NEW_ASC file DUB7:[TEST]NEW_ASC.OBJ;1 $ re .2 OK I'll do as you suggest about the name of the function.. Thanks, paolo
5607.4	LINKing using shareable image, object library...	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Fri May 02 1997 14:29`	21
	I'd tend to avoid LNK$LIBRARY -- it tends to get used by many different folks for different projects, and it thus tends to get used at unexpected times during unrelated LINKs. Instead, use: $ link new_asc,vaxcrtl_extensions/lib,sys$input:/opt sys$share:vaxcrtl/share $ DEC C eliminated the need to explicitly specify the shareable image, as the use of the decc$ prefix (see /PREFIX=ALL) means that symbols in the shareable image can be resolved by the default search of IMAGELIB conducted by the LINKER. I'd also recommend upgrading to DEC C V3.2, if possible. (If not an upgrade all the way to at least OpenVMS V5.5-2 and DEC C.) I had encountered a number of compiler bugs in the VAX C V3.0 (antique vintage) compiler.
5607.5	No DEC C V3.2 that I know of	CXXC::REINIG	This too shall change	`Mon May 05 1997 10:23`	6
	> I'd also recommend upgrading to DEC C V3.2, if possible. I hope you meant VAX C V3.2. August G. Reinig
5607.6	Of Two Minds On This Upgrade...	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Mon May 05 1997 10:36`	9
	: > I'd also recommend upgrading to DEC C V3.2, if possible. : : I hope you meant VAX C V3.2. Actually, I'd prefer this site upgrade to DEC C V5.5 or later, but yes, I'd meant to indicate "to VAX C V3.2", the last of the VAX C releases. (DEC C is superior to VAX C in a number of ways...)