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Re: Compiling and linking code from different places in the file system

From James Harris <james.harris.1@gmail.com>
Newsgroups comp.lang.misc
Subject Re: Compiling and linking code from different places in the file system
Date 2018-03-24 16:10 +0000
Organization A noiseless patient Spider
Message-ID <p95taj$gam$1@dont-email.me> (permalink)
References (11 earlier) <p8jddr$vo7$1@gioia.aioe.org> <p8q9rp$7gn$1@dont-email.me> <p8rtf9$1gsu$2@gioia.aioe.org> <p8t0hl$npf$1@dont-email.me> <p94o5c$a88$1@gioia.aioe.org>

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On 24/03/2018 05:38, Rod Pemberton wrote:
> On Wed, 21 Mar 2018 07:10:43 +0000
> James Harris <james.harris.1@gmail.com> wrote:
> 
> (snip)
> 
>> Yes and no.
> 
> ...
> 
>> Yes, the compiler has to produce object code for the
>> minimum CPU and instruction set.
> 
> Minimum?  Who /wants/ to support RM16? ...

That's not what I mean. Say you want to run 32-bit x86 code. Your 
minimum CPU could be a 386. Alternatively, if you wanted to use YMM 
registers you would target a higher minimum CPU.

Basically, whatever the target CPU is, the code will run on that CPU or 
higher. So any given object module will have been compiled for a certain 
minimum CPU.

> 
>> No, the compiler doesn't need to produce code for different
>> environments; it can leave that to interfacing code and the linker.
> 
> ...
> 
> So, one platform has sbrk() and another has mmap().
> 
> So, one platform has int 0x21, but another has syscall or sysenter.
> 
> So, one platform has an OS call for argv, argc, but another must create
> their own.
> 
> So, one platform has a POSIX compliant file I/O system, but another does
> not.
> 
> 
> I.e., I think issues like these, and others, would effectively require
> a software translation layer in between the host independent code
> your compiler is apparently producing, and the host dependent code the
> OS environment needs to execute the application. 

Exactly. I'd rather only link to the correct library code at load time 
but that's largely another topic and could not be done in all cases. For 
this thread, I was asking primarily about how to manage the process of 
building source code to object code, though there would be other 
applications.

> I believe this is
> needed in order to effect your belief that "the compiler doesn't need to
> produce code for different environments".  E.g., for sbrk() vs.
> mmap(), you'd need a single function that would eventually map onto
> either sbrk() or mmap() depending on what the OS environment supports.
> Dealing with all of these issues (an more), will create a library of
> such interface functions, or a translation layer.

Yes, all true.

> 
>> The make system is good. But it has its failings. Given that other
>> people have come up with alternatives, how do you get to the point of
>> saying that someone else considering an alternative is succumbing to
>> confirmation bias?
> 
> Plenty have tried and failed, but one is attempting it yet again?

Not quite. Different people have different goals or different 
requirements. So it's only natural that there are different programs.

...

>> Wouldn't it be better to have a program work out the possible
>> derivatives rather than having to specify them?
> 
> IMO, yes.
> 
>> You were arguing before for automation but now you seem to have
>> switched to manual specification.
> 
> Of course, but I thought you "rejected" the idea of parsing the code, or
> compiling a code snippet to determine this information.  You wanted a
> specification of some sort, or seemed to.  So, where do you put the
> specification?  A separate file, which is extra work synchronizing, or
> embedded within the code?  Comments are available, or should be, for
> every programming language, if you decide on embedding the
> specification within the code, instead of using separate control files
> or make files or scripts, etc.

I found I would need to split the config into two parts or phases: 
specification and then consolidation. The first part would indicate 
attributes of individual source files. The second would use those 
attributes to decide what to do.

To illustrate, consider these source files

   harness.nasm
   module.c

The first will only work in x86-32. Let's assume that the second will 
compile for any target which has words of 32 bits or wider and let's say 
we want to compile it for certain x86, Mips and Arm targets.

The 'specification' part would say "module.c needs at least 32-bit words".

And the consolidation part would have to say things such as the 
following (simplified) where "..." represents the commands needed.

* To build x86-32 from .nasm ...
* To build x86-32 from .c ...
* To build Mips-32 from .c ...
* To build Arm-32 from .c ...
* To build Arm-64 from .c ...

There's a mixture of build targets in there just to make the point. In 
reality there could be quite a few more targets. Each would use three 
things to decide what commands to run.

1. the attributes identified by the specification
2. the type of the source and
3. the type of the target.

In other words, the configurations will need to be written in two parts 
which are stored in different places. One part would be included with 
the source code and it would specify the attributes of the source files. 
The other part would be under the control of the user who was building 
the object files. On Unix this latter config could be in ~/ or /etc/ or 
both.

Whether you consider that automated or manual, perhaps it at least shows 
a bit more clearly what I have in mind.

> 
> Arguing?  Recommending.
> 
>> Sorry, I don't mean the builds being done in parallel. I just mean
>> that they can all be done as a result of the running of one command.
>> I.e. the command builds them all before it finishes. That could be in
>> parallel or concurrently or one after another.
> 
> So, forked/spawned builds (multi-process) at once for multiple
> platforms?  Or, sequential, one platform after another?

Either.


-- 
James Harris

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Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-01 14:40 +0000
  Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-01 14:55 +0000
    Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-02 21:05 +0000
      Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-03 01:18 +0000
        Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-09 01:03 +0000
      Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-06 06:40 -0500
        Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-06 21:10 +0000
          Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-07 06:58 -0500
            Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-09 01:23 +0000
              Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-09 02:28 -0500
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-09 02:44 -0500
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-09 23:26 +0000
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-11 07:44 -0400
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-12 21:59 +0000
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-14 01:45 -0400
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-14 10:59 +0000
      Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-06 06:40 -0500
        Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-06 21:20 +0000
          Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-07 06:58 -0500
            Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-09 10:30 +0000
  Re: Compiling and linking code from different places in the file system "James R. Kuyper" <jameskuyper@verizon.net> - 2018-03-01 11:11 -0500
    Re: Compiling and linking code from different places in the file system "James R. Kuyper" <jameskuyper@verizon.net> - 2018-03-01 13:51 -0500
    Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-03 09:48 +0000
  Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-03 12:25 +0000
    Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-03 15:32 +0000
      Re: Compiling and linking code from different places in the file system Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-03-04 07:52 +0000
      Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-04 08:43 +0000
        Re: Compiling and linking code from different places in the file system Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-03-05 07:58 +0000
          Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-06 21:37 +0000
            Re: Compiling and linking code from different places in the file system Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-03-07 21:02 +0000
        Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-05 15:29 +0000
          Re: Compiling and linking code from different places in the file system rugxulo@gmail.com - 2018-03-06 18:23 -0800
          Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-07 04:54 +0000
            Re: Compiling and linking code from different places in the file system Robert Wessel <robertwessel2@yahoo.com> - 2018-03-07 00:33 -0600
              Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-07 09:55 +0000
              Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-07 17:29 +0000
  Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-06 06:39 -0500
    Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-07 10:44 +0000
      Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-07 06:57 -0500
        Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-09 10:28 +0000
          Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-11 07:44 -0400
            Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-12 22:44 +0000
              Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-14 01:47 -0400
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-14 10:23 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-14 11:30 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-14 11:30 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-14 13:30 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-14 14:32 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-14 16:01 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-14 19:28 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-15 08:59 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-15 19:21 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-16 08:08 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-16 11:12 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-16 16:45 +0100
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-16 16:09 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-16 18:42 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-17 18:32 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-17 21:37 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-17 21:00 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-18 11:39 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-18 12:29 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-19 13:38 +0000
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-20 05:40 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-20 11:05 +0000
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-21 06:03 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-21 18:51 +0000
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-21 19:55 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-23 18:03 +0000
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-23 20:13 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-24 01:30 +0000
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-24 16:48 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-26 19:42 +0100
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-26 22:35 +0100
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-24 12:01 +0100
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-23 20:58 +0100
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-23 20:49 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-20 18:37 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-21 19:33 +0000
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-21 20:35 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-23 21:10 +0100
                Re: Compiling and linking code from different places in the file system Marco van de Voort <marcov@toad.stack.nl> - 2018-04-19 06:47 +0000
                Re: Compiling and linking code from different places in the file system Andy Walker <anw@cuboid.co.uk> - 2018-03-27 00:58 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-30 19:55 +0100
                Re: Compiling and linking code from different places in the file system Marco van de Voort <marcov@toad.stack.nl> - 2018-04-19 06:49 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-23 21:04 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-23 21:54 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-24 11:22 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-24 12:12 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-24 13:15 +0100
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-24 13:36 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-24 14:52 +0000
                Re: Compiling and linking code from different places in the file system Marco van de Voort <marcov@toad.stack.nl> - 2018-04-19 11:06 +0000
                Re: Compiling and linking code from different places in the file system David Brown <david.brown@hesbynett.no> - 2018-03-14 16:52 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-14 19:38 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-15 09:00 +0100
                Re: Compiling and linking code from different places in the file system bartc <bc@freeuk.com> - 2018-03-15 12:54 +0000
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-14 11:18 +0000
                Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-14 13:52 +0100
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-15 06:29 -0400
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-15 20:37 +0000
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-17 11:51 -0400
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-20 06:31 +0000
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-20 17:14 -0400
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-21 07:10 +0000
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-24 01:38 -0400
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-24 16:10 +0000
                Re: Compiling and linking code from different places in the file system Rod Pemberton <NoEmail@trraxvfeqa.prg> - 2018-03-24 20:05 -0400
                Re: Compiling and linking code from different places in the file system James Harris <james.harris.1@gmail.com> - 2018-03-25 16:55 +0100
  Re: Compiling and linking code from different places in the file system "Pascal J. Bourguignon" <pjb@informatimago.com> - 2018-03-14 13:39 +0100

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