Different *CFLAGS in gcc/Makefile.in

[Basile STARYNKEVITCH]

Ralf Wildenhues wrote:
> * Basile STARYNKEVITCH wrote on Tue, Mar 18, 2008 at 09:06:33PM CET:
>> in gcc/Makefile.in there are many different *CFLAGS, notablye
>>
>> ALL_CFLAGS = $(X_CFLAGS) $(T_CFLAGS) \
>>   $(CFLAGS) $(INTERNAL_CFLAGS) $(COVERAGE_FLAGS) $(WARN_CFLAGS)  
>> $(XCFLAGS) @DEFS@
>>
>> Do anyone have a precise idea of what all these *CFLAGS are exactly for?
> 
> AFAICS each warning flag is described where it is defined.  So just
> search for ^INTERNAL_CFLAGS, for example.

It is indeed the easiest. But for X_CFLAGS & T_CFLAGS I only found the 
comment
# These exists to be overridden by the x-* and t-* files, respectively.
and for XCFLAGS

# XCFLAGS is used for most compilations but not when using the GCC just 
built.

Actually, I am asking because for my MELT branch, I need to run 
(sometimes) a C compiler from within a (resource hungry) C pass. So I 
guessed

## the C flags (without any gcc -I...stuff) to be included in
## compilation of MELT generated C code thru the melt-cc-script
## do not put  $(INTERNAL_CFLAGS) $(COVERAGE_FLAGS) $(WARN_CFLAGS) ##there!
MELT_CFLAGS= $(X_CFLAGS) $(T_CFLAGS) $(CFLAGS) $(XCFLAGS)

But I'm not sure of the T_CFLAGS (it probably is related to target 
specific stuff only).

A big thanks to Ralf for his reply.

Regards.

-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
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