PTHREAD_CFLAGS provided by AX_PTHREAD where best to be attached?

[Dudziak Krzysztof]

Hi,
For makefiles which build piece of software in two separate steps: compilation 
then linking,
will it be better to attach  PTHREAD_CFLAGS to higher-level_CPPFLAGS than to 
higher-level_CFLAGS variable?
Autotools along with libtool are used here, user-level variables (CFLAGS, 
CPPFLAGS) are not manipulated through whole build chain.
I can manipulate variables only at Makefile.am -level.

I learned gcc expects -pthread option which translates among others to some 
preprocessor define,
therefore I wonder if it won't be better to attach PTHREAD_CFLAGS to 
higher-level_CPPFLAGS rather than
to higher-level_CFLAGS.

Regarding PTHREAD_CFLAGS the AC_PTHREAD manual talks about CFLAGS, not about 
CPPFLAGS.
I guess attaching to ..._CFLAGS would be fine if building is made in one single 
step.

Thanks
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