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Dominic WILLIAMS | 4 Sep 2000 17:53
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Parallel builds on NT ?

Hello,

I am interested in using jam on NT.

The home page (http://www.perforce.com/jam/jam.html) states among
features that: "On UNIX and NT, jam can do this with multiple, concurrent
processes. " On the other hand, the documentation on the jam command
(http://public.perforce.com/public/jam/src/Jam.html) says that the -j option
(number of concurrent jobs) is "UNIX only".

What is the situation ?

Thanks for your help,

Dominic Williams.
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Alexander Nicolaou | 4 Sep 2000 18:49
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Re: Parallel builds on NT ?

> I am interested in using jam on NT.
> 
> The home page (http://www.perforce.com/jam/jam.html) states among
> features that: "On UNIX and NT, jam can do this with multiple, concurrent
> processes. " On the other hand, the documentation on the jam command
> (http://public.perforce.com/public/jam/src/Jam.html) says that the -j option
> (number of concurrent jobs) is "UNIX only".

I assume -j is implemented for NT, but if you're using MSVC's compiler 
you cannot use it. The issue is that to save space and time cl creates
a ".pdb" file which is a database of debugging information for your 
program, and only one compile process at a time can update this file;
the second simultaneous compile will fail (just like the irritating
feature that you can't compile while also running the debugger).

With g++ you will not have this problem, but g++ is about twice as 
slow as MSVC at at compile time, so there is zero gain on a dual 
processor machine. (Although g++ accepts a more complete subset of
ANSI C++ than MSVC, particularly in regard to templates.)

alex
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Martine Habib | 4 Sep 2000 19:16
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RE: Parallel builds on NT ?

You can use the -j option, however, if you do not use "compiler pdb files"
(obtained by using the option /Zi), but "linker" pdb files (obtained by
using the /pdb: linker option. The price is that either you get an "all
release" build with limited debug info, or you have to build using /Z7 with
full debug info.

-----Original Message-----
From: Alexander Nicolaou [mailto:anicolao <at> mud.cgl.uwaterloo.ca]
Sent: Monday, September 04, 2000 9:49 AM
To: d.williams <at> csee-transport.fr
Cc: jamming <at> perforce.com
Subject: Re: [jamming] Parallel builds on NT ?

> I am interested in using jam on NT.
> 
> The home page (http://www.perforce.com/jam/jam.html) states among
> features that: "On UNIX and NT, jam can do this with multiple, concurrent
> processes. " On the other hand, the documentation on the jam command
> (http://public.perforce.com/public/jam/src/Jam.html) says that the -j
option
> (number of concurrent jobs) is "UNIX only".

I assume -j is implemented for NT, but if you're using MSVC's compiler 
you cannot use it. The issue is that to save space and time cl creates
a ".pdb" file which is a database of debugging information for your 
program, and only one compile process at a time can update this file;
the second simultaneous compile will fail (just like the irritating
feature that you can't compile while also running the debugger).

With g++ you will not have this problem, but g++ is about twice as
(Continue reading)

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Edward Lam | 5 Sep 2000 01:33
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RE: Parallel builds on NT ?

--- Martine Habib <mhabib <at> microsoft.com> wrote:
> You can use the -j option, however, if you do not
> use "compiler pdb files" (obtained by using the 
> option /Zi), but "linker" pdb files (obtained by
> using the /pdb: linker option. The price is that
> either you get an "all release" build with limited 
> debug info, or you have to build using /Z7 with full

> debug info.

Just to clarify, you mean that if I want to use the -j
option with jam and MSVC, then I just use /Z7 with cl,
right? What are the disadvantages to using /Z7 vs. /Zi
?  I presume that you would lose the ability to do
"edit and debug" but I don't tend to use this feature
anyways.

Thanks,
-Edward

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Martine Habib | 5 Sep 2000 01:52
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RE: Parallel builds on NT ?

>Just to clarify, you mean that if I want to use the -j
>option with jam and MSVC, then I just use /Z7 with cl,
>right?

Correct.

>What are the disadvantages to using /Z7 vs. /Zi ?

You also lose incremental linking and compilation. This can still be OK if
your modules are not too large, as you gain quite a lot of speed by using
-j.
You do, of course also lose "Edit and Continue".

Martine

-----Original Message-----
From: Edward Lam [mailto:e4lam <at> yahoo.com]
Sent: Monday, September 04, 2000 4:34 PM
To: Martine Habib; 'Alexander Nicolaou'; d.williams <at> csee-transport.fr
Cc: jamming <at> perforce.com
Subject: RE: [jamming] Parallel builds on NT ?

--- Martine Habib <mhabib <at> microsoft.com> wrote:
> You can use the -j option, however, if you do not
> use "compiler pdb files" (obtained by using the 
> option /Zi), but "linker" pdb files (obtained by
> using the /pdb: linker option. The price is that
> either you get an "all release" build with limited 
> debug info, or you have to build using /Z7 with full
(Continue reading)

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Lee Marzke | 5 Sep 2000 21:21

Setting environment variables for compiler

How would you set an environment variable 

e.g. GCC_EXEC_PREFIX

in a Jamfile? ( on Unix )   We have different targets that use
different version of GCC and this changes often.

Thanks,

Lee
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Dominic WILLIAMS | 6 Sep 2000 13:48
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automagically listing source files

Hello,

Thanks for your useful information on parallel builds on NT. One thing I
can say for Jam is that it has a friendly and competent user group !

With gnu make, I am used to listing source files automatically, e.g.

myprog:  $(wildcard *.cpp)

This way, the makefile can be set up once and for all, and does not need
to be modified each time a new source file is added to the project. Is this
sort of thing possible using Jam ?

Dominic.
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Sawhney, Davinder | 8 Sep 2000 16:41

Anyone looking for Jamming job - Maryland-Baltimore area

Hi! 

I am not sure if this is the correct use of this group
but any interested in consulting or permanent job in the
Maryland area can email me with their resume

Davinder
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Lex Spoon | 8 Sep 2000 18:36
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Re: automagically listing source files

In my view, one of the nice things about Jam is that it gets away from
wildcard stuff.  What's so hard about:

	SourceFile  foo.c ;
	SourceFile  bar.c ;
	(etc)

If you can write the code for a file, then you can certainly add a line
to the Jamfile for it.  And the really nice thing is, you can say what
*kind* of source file it is, even if the filename doesn't help:

	ExtraOptimizedSourceFile  zap.c ;

Furthermore, if you have any automatically generated *.c files, they
won't get picked up.

So anyway, you *can* do things like what you describe, but I actually
like having things listed out, better.

-Lex

Dominic WILLIAMS <d.williams <at> csee-transport.fr> wrote:
> Hello,
> 
> Thanks for your useful information on parallel builds on NT. One thing I
> can say for Jam is that it has a friendly and competent user group !
> 
> With gnu make, I am used to listing source files automatically, e.g.
> 
> myprog:  $(wildcard *.cpp)
(Continue reading)

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Lex Spoon | 8 Sep 2000 18:33
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Re: Setting environment variables for compiler

What does this have to do with environment variables, exactly?  You can
do things like:

	set CC = /bin/gcc  on  foo.o  ;

(I'm sure this syntax isn't exactly right).  Anyway, then the regular
Jam commands will use that version of CC just for foo.o.

-Lex

Lee Marzke <lmarzke <at> kns.com> wrote:
> How would you set an environment variable 
> 
> e.g. GCC_EXEC_PREFIX
> 
> in a Jamfile? ( on Unix )   We have different targets that use
> different version of GCC and this changes often.
> 
> Thanks,
> 
> Lee
> _______________________________________________
> jamming mailing list  -  jamming <at> perforce.com
> http://maillist.perforce.com/mailman/listinfo/jamming
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Gmane