[Boost-build] Language specific flags.

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2007-02-23 02:32:49

Historically when we specify <cflags> those get added to compiles of C++ 
files and not just C files. I have a need to compile C99 code using GCC 
so I add "<cflags>-std=c99" someplace globally (since I don't care about 
compiling < C99). Problem is that now I get a warning from GCC for all 
C++ compile files:

cc1plus: warning: command line option "-std=c99" is valid for C/ObjC but 
not for C++

So I went looking at the BBv2 code and trying to figure out how to 
handle the need to have language specific flags. To my surprise, there 
doesn't seem to be a way, short of adding more features and hence 
changing all the toolsets. I tried the seemingly obvious obvious:

   <toolset>gcc,<target-type>C:<cflags>-std=c99

Which had zero effect, in as far as it added the option regardless.

Is there some easy/reasonable way to have C only flags?

If not, how can we add language specific flags? (Or should I go ahead 
and figure out how to make my attempt above work?)

PS. Ideally I would rather be able to do 
"<toolset>gcc,<type>c:<flags>-std=c99".

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