Re: compile+link Fujitsu Linux

On Wed, 6 Feb 2008 00:34:14 -0800 (PST), Richard <riplin@xxxxxxxxxxxx> wrote:

On Feb 6, 7:39 pm, Robert <n...@xxxxxx> wrote:

I don't know how you manage to make stuff go missing, but it just
doesn't happen to me.

We frequently build new environments. Populating them is controlled by component lists,
we don't just cp *. New files can be missing from the list. Files thought to be obsolete
might still be in use.

Well actually I can see that if you fail to include a program in the
list to be put in the library (by screwing up the editing), then
overwriting the previous library will make that program fail to be
CALLed, but the startup found the library OK.

Startup doesn't just check for the library's existance, it resolves all externs.

But you don't test the libraries so you wouldn't notice that until the
batch run failed halfway through when it tried to CALL what is now
missing.

We check batch jobs hours BEFORE they are run, by executing ldd. If there is going to be a
problem, we fix it BEFORE the job starts, or change the schedule. The Unix loader checks
again at startup time.

Dynamic loading is the only way a program can fail halfway through. That's why it is not
THE NORM.

Changes in one program can't cause errors in other programs unless they share global data.

Or data in parameters to the CALL of that program or in CALLs that
program makes.

That's global data, which is bad practice.

Excuse me, but parameters to a CALL are now 'global data' ?

If you pass a structure to program A (by reference) and then pass the same structure to
program B, that structure is global data. The scope of the globe may be smaller than other
globes.

I'll also mention to OO users that 'object data' should not be used
because it is 'global' to the methods.

Object data is local to the object instance or class. OO was created to get away from
sharing data between 'programs'. The word is encapsulation.

.

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