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Re: PATCH RFA: Use $(COMPILER) to build objects

On Sun, May 24, 2009 at 9:58 AM, Paolo Bonzini <> wrote:
> Ian Lance Taylor wrote:
>> This is a preliminary step toward supporting a configure option to build
>> gcc using either a C compiler or a C++ compiler. ?I think it would lead
>> to long term confusion to use $(CC) in a Makefile to represent a C++
>> compiler. ?This patch instead arranges to compile all code using
>> $(COMPILER). ?CFLAGS changes to COMPILER_FLAGS and ALL_CFLAGS changes to
>> ALL_COMPILERFLAGS. ?The COMPILER make variable is currently always set
>> to $(CC); my intent is that in the future, a configure option will
>> permit it to be set to either $(CC) or $(CXX).
> I am not sure it is a good idea. ?The main reason is that I think this
> --enable-cxx-for-cc option should be in gcc, not in the toplevel. ?I
> don't see any problem with CC representing a C++ compiler, since it is
> used to compile C/C++-common-subset code.

If the gcc-in-cxx project succeeds, we will want to write libcpp in
C++ as well.  So, although I did not include the changes to make
libcpp use $(COMPILER),  I think that making this change at top-level
is appropriate.

It's true that today the code is in the C/C++ common subset.  However,
if the gcc-in-cxx project succeeds, the code will move to C++.
Despite that, there is code in gcc which will always be compiled with
a C compiler--e.g., crtstuff.c (I understand that that may move to
libgcc eventually, but the one need not be tied to the other).  In any
case, in all autoconf projects $(CC) reliably is a C compiler and
$(CXX) reliably is a C++ compiler.  I think that having $(CC) expand
to a C++ compiler is a recipe for future confusion.  I think we should
avoid that confusion today, while we can.


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