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Difference between Compile-link-go and compile-link
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Vedam

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PostPosted: Thu Apr 10, 2008 12:25 pm
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Hi,

Can you please let me know the difference between Compile-Link-go and Compile-Link?

Thanks
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revel

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PostPosted: Thu Apr 10, 2008 12:57 pm
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Hai

Is this Home Work :-)

Ok, Here is answer for your Question

To RUN Any application Program you should convert it into Machine Language(ie Executable instruction)

To do So

We will use JCL, The JCL will have 3 steps normally

1. COMPILATION STEP -
It will convert SOURCE(Say COBOL program) into OBJECT MODULE
(Its not executable intruction)

Ex; COBOL COMPILER - IGYCRCTL

2. LINAKGE STEP
This STEP will LINK EDIT OBJECT MODULE and will yield LOAD
MODULE(This is executable instruction)

3. RUN Step
This Step is used to RUN Application program(Mean in turn it will use LOAD MODULE)

Hope u clear
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Aaru

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PostPosted: Thu Apr 10, 2008 2:19 pm
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revel,

You have explained how to compile-link-run a cobol program. But i think OP was something different.

He wanted to know the difference between compile-link-go and compile-link.

Gng by the terms i think

compile-link-go -> Compile+link+run

compile-link -> Just compile and link.
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Vedam

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PostPosted: Thu Apr 10, 2008 2:48 pm
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Hi,

Thanks for your replies...

1. When you mean by 'Run (Go)' the application program, does it actually submit the JCl for program execution or something else?

2. During 'Link', the load module gets created permanently, right?
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dbzTHEdinosauer

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PostPosted: Thu Apr 10, 2008 3:18 pm
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Vedam,

1. compile/link/go is a job that has the three steps:
compile step
link step
exec pgm='your program'

you create the jcl and submit the job.

2. yes
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dbzTHEdinosauer

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PostPosted: Thu Apr 10, 2008 3:44 pm
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compile link and go is just an abbreviation for a job that contains the compile, link and exec program (test the program) steps.

compile & link means a job that has only the compile and link steps. an additional job with the appropriate JCL to support the invocation of your program would be needed in the case.
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Aaru

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PostPosted: Thu Apr 10, 2008 4:50 pm
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Dick,

Quote:
2. During 'Link', the load module gets created permanently, right?


Dick wrote:

Quote:
yes


It also depends on what is coded in the DISP parameter.
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dbzTHEdinosauer

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PostPosted: Thu Apr 10, 2008 5:27 pm
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Aaru, that is true, also depends whether the output dsn for the loadmodule is a temp (&&..) or a catlg ds.


but, if you want to be picky, which disp parm? I doubt if the OP knows what you are talking about.
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Phrzby Phil

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PostPosted: Thu Apr 10, 2008 5:54 pm
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For programs not requiring link (e.g., no subroutines), there is also compile-go, which uses the loader, rather than the link-editor.
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Aaru

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PostPosted: Thu Apr 10, 2008 7:47 pm
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Dick,

Quote:
but, if you want to be picky, which disp parm? I doubt if the OP knows what you are talking about.


Hmm yes, even i don't think OP would have understood icon_sad.gif
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revel

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PostPosted: Fri Apr 11, 2008 12:08 pm
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Dear Phrzby Phil,

Quote:
For programs not requiring link (e.g., no subroutines), there is also compile-go, which uses the loader, rather than the link-editor


I completly disagree about this,

We must need LINK STEP(Having LINKER say IEWL/HEWL) for getting Load module.
In next that is GO Step, we will use created load module for RUN/EXECUTION

<Note: What i meant is At any cost Load module will be created>

If u want to bypass that STEP ie LINK STEP, U can Route load module to TEMPERUARY DATASET and Make use of That in GO STEP
Then it Will work

Hope u r getting
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dick scherrer

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PostPosted: Fri Apr 11, 2008 1:17 pm
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Hello,

Quote:
If u want to bypass that STEP ie LINK STEP, U can Route load module to TEMPERUARY DATASET
Huh? This does not bypass the link step - it simply places the link output in a temporary dataset.

Quote:
I completly disagree about this,

We must need LINK STEP(Having LINKER say IEWL/HEWL) for getting Load module.
Maybe you just learned (or will have learned) something new. What if no load module is needed?

As was posted:
Quote:
For programs not requiring link (e.g., no subroutines), there is also compile-go, which uses the loader, rather than the link-editor.
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revel

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PostPosted: Fri Apr 11, 2008 4:11 pm
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dick scherrer,


What i meant is

Quote:
If u want to bypass that STEP ie LINK STEP, U can Route load module to TEMPERUARY DATASET


mean if i won't include LINK STEP in JCL, it will places load module in Temperuary Library and To run that pgm we should referback to a load module where it is created(ie Temperuary dataset)

Please See Sentence which i gaven above
Quote:
If u want to bypass that STEP ie LINK STEP, U can Route load module to TEMPERUARY DATASET and Make use of That in GO STEP
Then it Will work
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enrico-sorichetti

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PostPosted: Fri Apr 11, 2008 4:24 pm
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if You bypass the link/bind step You will not have a load module !

a load module is produced only by the linkage_editor/binder
any compiler produces only object format thing ( not executable )

a load module library has a recfm U ( undefined )
an object library ( output of a compilation ) has a recfm FB ( usually )
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Phrzby Phil

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PostPosted: Fri Apr 11, 2008 6:01 pm
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Well, all I can say is that I do in fact run a compile-go proc, and it does not have a link-edit step. There is no load module as such stored in either a perm or temp dataset, as I do not need it - the loader (an IBM utility) simply creates a "load module" on the fly and runs it. Then it's gone.

If someone else says I have not been doing that, then what can I say?
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revel

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PostPosted: Wed Apr 16, 2008 10:25 am
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Hi all,

Quote:
Can you please let me know the difference between Compile-Link-go and Compile-Link


The COMPILE-LINK-GO will have three STEPS in a PROC where as COMPILE-LINK will have 2 STEPS in PROC

Find below differance between these 2

COMPILE-LINK-GO
_________________

Code:
//IGYWCLG PROC LNGPRFX='IGY.V2R1M0',SYSLBLK=3200,
// LIBPRFX='CEE',GOPGM=GO
//*
//* COMPILE, LINK EDIT AND RUN A COBOL PROGRAM
//*
//* PARAMETER DEFAULT VALUE USAGE
//* LNGPRFX IGY.V2R1M0
//* SYSLBLK 3200
//* LIBPRFX CEE
//* GOPGM GO
//*
//* CALLER MUST SUPPLY //COBOL.SYSIN DD ...
//*
//COBOL EXEC PGM=IGYCRCTL,REGION=2048K
//STEPLIB DD DSNAME=&LNGPRFX..SIGYCOMP,
// DISP=SHR
//SYSPRINT DD SYSOUT=*
//SYSLIN DD DSNAME=&&LOADSET,UNIT=VIO,
// DISP=(MOD,PASS),SPACE=(TRK,(3,3)),
// DCB=(BLKSIZE=&SYSLBLK)
//SYSUT1 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT2 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT3 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT4 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT5 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT6 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT7 DD UNIT=VIO,SPACE=(CYL,(1,1))
//LKED EXEC PGM=HEWL,COND=(8,LT,COBOL),REGION=1024K
//SYSLIB DD DSNAME=&LIBPRFX..SCEELKED,
// DISP=SHR
//SYSPRINT DD SYSOUT=*
//SYSLIN DD DSNAME=&&LOADSET,DISP=(OLD,DELETE)
// DD DDNAME=SYSIN
//SYSLMOD DD DSNAME=&&GOSET(&GOPGM),SPACE=(TRK,(10,10,1)),
// UNIT=VIO,DISP=(MOD,PASS)
//SYSUT1 DD UNIT=VIO,SPACE=(TRK,(10,10))
//GO EXEC PGM=*.LKED.SYSLMOD,COND=((8,LT,COBOL),(4,LT,LKED)),
// REGION=2048K
//STEPLIB DD DSNAME=&LIBPRFX..SCEERUN,
// DISP=SHR
//SYSPRINT DD SYSOUT=*
//CEEDUMP DD SYSOUT=*
//SYSUDUMP DD SYSOUT=*


Here Load module will created in a STEP

Code:
//LKED EXEC PGM=HEWL,COND=(8,LT,COBOL),REGION=1024K

.
.
Code:
//SYSLMOD DD DSNAME=&&GOSET(&GOPGM),SPACE=(TRK,(10,10,1)),


So it is placing in a library &&GOSET ie Temperuary dataset

In GO STEP ie

Code:
//GO EXEC PGM=*.LKED.SYSLMOD,COND=((8,LT,COBOL),(4,LT,LKED)),


We are referback using a parameter called PGM=*.LKED.SYSLMOD --- So its pointing out to the load module library then it will RUN

COMPILE-LINK
_____________

Code:
//IGYWCLG PROC LNGPRFX='IGY.V2R1M0',SYSLBLK=3200,
// LIBPRFX='CEE',GOPGM=GO
//*
//* COMPILE, LINK EDIT AND RUN A COBOL PROGRAM
//*
//* PARAMETER DEFAULT VALUE USAGE
//* LNGPRFX IGY.V2R1M0
//* SYSLBLK 3200
//* LIBPRFX CEE
//* GOPGM GO
//*
//* CALLER MUST SUPPLY //COBOL.SYSIN DD ...
//*
//COBOL EXEC PGM=IGYCRCTL,REGION=2048K
//STEPLIB DD DSNAME=&LNGPRFX..SIGYCOMP,
// DISP=SHR
//SYSPRINT DD SYSOUT=*
//SYSLIN DD DSNAME=&&LOADSET,UNIT=VIO,
// DISP=(MOD,PASS),SPACE=(TRK,(3,3)),
// DCB=(BLKSIZE=&SYSLBLK)
//SYSUT1 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT2 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT3 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT4 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT5 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT6 DD UNIT=VIO,SPACE=(CYL,(1,1))
//SYSUT7 DD UNIT=VIO,SPACE=(CYL,(1,1))
//LKED EXEC PGM=HEWL,COND=(8,LT,COBOL),REGION=1024K
//SYSLIB DD DSNAME=&LIBPRFX..SCEELKED,
// DISP=SHR
//SYSPRINT DD SYSOUT=*
//SYSLIN DD DSNAME=&&LOADSET,DISP=(OLD,DELETE)
// DD DDNAME=SYSIN
//SYSLMOD DD DSNAME=&&GOSET(&GOPGM),SPACE=(TRK,(10,10,1)),
// UNIT=VIO,DISP=(MOD,PASS)
//SYSUT1 DD UNIT=VIO,SPACE=(TRK,(10,10))


<HERE There is no GO STEP ie RUN STEP>

To RUN

You should write one JCL like

Code:
// job card
//STEP01 EXEC PGM=member name
//STEPLIB DD  DSN=load module library < which is created in LKED STEP and In SYSLMOD ddname
//SYSIN DD ....
//SYSOUT DD ....


Hope u clear
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