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Re: [Axiomdeveloper] ENV
From: 
root 
Subject: 
Re: [Axiomdeveloper] ENV 
Date: 
Wed, 22 Nov 2006 17:36:17 0500 
 > regress:
 > ${ENV} ${MAKE} DAASE=$(axiom_targetdir) regressiontests

 BTW, why isn't it

 ${MAKE} ${ENV} DAASE=$(axiom_targetdir) regressiontests

First, for defining terms, the "current Makefile" is the makefile
that contains the above chosen line. The "current Makefile" will
try to execute the "new Makefile". So the question is, what will
be the effect in the "new Makefile" of the different order?
Hmmm, the question is one of expansion I suppose. Lets assume that
the current Makefile
SRC=/axiom/src
INT=/axiom/int
ENV = SRC=${SRC} INT=${INT}
then the first expression expands to:
SRC=/axiom/src INT=/axiom/int ${MAKE} DAASE=$(axiom_targetdir) regressiontests
which means that in the newly executing Makefile the variable values of
SRC and INT will NOT be overridden if they are set in the new Makfile
DAASE will be overridden if the are set in the new Makefile
and the second expression expands to:
${MAKE} SRC=/axiom/src INT=/axiom/int DAASE=$(axiom_targetdir) regressiontests
which means that in the newly executing Makefile the variable values of
SRC and INT WILL be overridden if they are set in the new Makfile
DAASE WILL be overridden if the are set in the new Makefile
so the issue is one of overriding the value assignments in the new Makefile.
prefix form sets the environment values but the new Makefile assignments
will be used if they are set.
postfix form sets the environment values but overrides the new Makefile
assignments if they are set.
This is used in axiom now. In the top level Makefile we have a variable
called NOISE. If we want to override that variable we simply type:
make NOISE=
t
 Re: [Axiomdeveloper] ENV, (continued)
 Re: [Axiomdeveloper] ENV, Waldek Hebisch, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, root, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, Humberto Ortiz Zuazaga, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, Ralf Hemmecke, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV,
root <=
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, root, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, root, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, root, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, Waldek Hebisch, 2006/11/22
 Re: [Axiomdeveloper] ENV, Gabriel Dos Reis, 2006/11/22
 Re: [Axiomdeveloper] ENV, Waldek Hebisch, 2006/11/22