[Python-Dev] Any reason why CPPFLAGS not used in compiling?

[Brett C.]

Martin v. Löwis wrote:
> Brett C. wrote:
> 
>> I noticed that Makefile.pre.in uses the value from the environment 
>> variable LDFLAGS but not CPPFLAGS.  Any reason for this? 
> 
> 
> How did you notice that? For LDFLAGS, Makefile.pre.in has
> 
> LDFLAGS=        @LDFLAGS@
> 
> This does *not* mean that the value from the environment is used.
> Instead, it means that configure computes the value of LDFLAGS
> when it generates Makefile.in. For CPPFLAGS, configure has nothing
> to compute, so Makefile.pre.in just has the static value for
> CPPFLAGS.
> 

I am not so sure that is true.  Checking configure.in, there is no mention of 
CPPFLAGS anywhere.  And yet if I modify the definition of CPPFLAGS in 
Makefile.pre.in to ``-I. -I./Include @CPPFLAGS@`` it ends up containing the 
value I have for the environment variable at the end of it.  I think the '@@' 
syntax uses a value from configure.in if it is defined else it defaults to the 
value the shell has.

-Brett