FW: MPI-Beowulf configuration question: where does Makefile @XXX_XXX@ notation come from?

[Pedro Díaz Jiménez]

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Hi Chris,


Hey, are you sure that this is a Makefile, not a Makefile.in?. Values in 
@XXX@ form are used in Makefile.in. Makefile.in files are supposed to be 
processed by a configure script which creates a ready to use Makefile.

For example, if you have in Makefile.in something like:
CC= @CC@    
	all:
		$(CC) somefile.c etc.....

the configure script is told to guess the C compiler program, and substitute 
in each makefile.in the @CC@ meta-var to the actual C compiler program, for 
example. Take a look at the info for autoconf 

"""
Substitutions in Makefiles
==========================
 
   Each subdirectory in a distribution that contains something to be
compiled or installed should come with a file `Makefile.in', from which
`configure' will create a `Makefile' in that directory.  To create a
`Makefile', `configure' performs a simple variable substitution,
replacing occurrences of `@VARIABLE@' in `Makefile.in' with the value
that `configure' has determined for that variable.  Variables that are
substituted into output files in this way are called "output
variables".  They are ordinary shell variables that are set in
`configure'.  To make `configure' substitute a particular variable into
the output files, the macro `AC_SUBST' must be called with that
variable name as an argument.  Any occurrences of `@VARIABLE@' for
other variables are left unchanged.  *Note Setting Output Variables::,
for more information on creating output variables with `AC_SUBST'.
 
   A software package that uses a `configure' script should be
distributed with a file `Makefile.in', but no `Makefile'; that way, the
user has to properly configure the package for the local system before
compiling it.
"""

Hope that helps

Cheers
Pedro
 
On Thursday 02 August 2001 16:34, you wrote:
> -----Original Message-----
> From: Chris Richard Adams
> Sent: Thursday, August 02, 2001 12:10 PM
> To: 'Pedro Díaz Jiménez'
> Subject: RE: MPI-Beowulf configuration question: where does Makefile
> @XXX_XXX@ notation come from?
>
>
> Have you tried the info pages for man?
>
>
> Hi Pedro;
>
> regarding documentation: I've read the Scyld Beowulf Quick Install,
> Installing Scyld Beowulf Guide, and the Scyld Beowulf Scalable Computing
> Guide.  None of those documents reference the questions I've posed. I've
> run info on those documents - which I believe are the same as the HTML
> formatted guides stated above.
>
> THe example/bin directory contains execs with no docs at all. I'm
> tempted just to run them, but fear destroying somehting in the process.
>
> > Q4.) What is the difference between the /examples and /mpe_examples?
> > What does mpe mean?
>
> MPE is an extension to  MPI in the form of a library. It adds some
> useful
> routines and functions for profiling, visualitation, logging, etc...
> Take a look at
> http://www-unix.mcs.anl.gov/mpi/mpich/docs/mpeguide/paper.htm
>
> Great - thanks for the link!!
>
> Chris

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  __________________________________________________
 /                                                  \
 | Pedro Diaz Jimenez                               |
 |                                                  |
 | pdiaz88 at terra.es      pdiaz at acm.asoc.fi.upm.es   |
 |                                                  |
 |                                                  |
 | http://planetcluster.org                         |
 | Clustering & H.P.C. news and documentation       |
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 | There are no stupid questions, but there're a    |
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