R devel - Aug 2013 - Makevars and Makeconf sequencing

http://cran.r-project.org/doc/manuals/R-exts.html#Configure-and-cleanup
near the start of 1.2.1 Using Makevars says
> There are some macros which are set whilst configuring the building of
> R itself and are stored in R_HOME/etcR_ARCH/Makeconf. That makefile is
> included as a Makefile after Makevars[.win], and the macros it defines
> can be used in macro assignments and make command lines in the latter.
> 
I'm confused.  If Makeconf is included after Makevars, then how can
Makevars use macros defined in Makeconf?

Or is the meaning only that a variable definition in Makeconf can be
overridden in Makevars?

Ross Boylan

On Aug 23, 2013, at 7:53 PM, Ross Boylan <ross at biostat.ucsf.edu> wrote:
> http://cran.r-project.org/doc/manuals/R-exts.html#Configure-and-cleanup
> near the start of 1.2.1 Using Makevars says
> 
>> There are some macros which are set whilst configuring the building of
>> R itself and are stored in R_HOME/etcR_ARCH/Makeconf. That makefile is
>> included as a Makefile after Makevars[.win], and the macros it defines
>> can be used in macro assignments and make command lines in the latter.
>> 
> I'm confused.  If Makeconf is included after Makevars, then how can
> Makevars use macros defined in Makeconf?
> 
Because regular (recursively expanded) variables in makefiles are evaluated
lazily (i.e., when substituted).

> Or is the meaning only that a variable definition in Makeconf can be
> overridden in Makevars?
> 
> Ross Boylan
> 
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