How to run the cpp(preprocessor) g++ tests?

[Andres Tiraboschi]

2015-10-15 18:10 GMT-03:00 Segher Boessenkool <segher@kernel.crashing.org>:
> On Thu, Oct 15, 2015 at 05:47:05PM -0300, Andres Tiraboschi wrote:
>> Hi, I've been working a bit with the gcc preprocessor but don't know
>> exactly how to run just the cpp tests for g++(the tests located in the
>> gccSource/gcc/testsuite/g++.dg/cpp/) without running all the
>> testsuite.
>> I couldn't find anything about it in the documentation.
>
> make -k check-gcc-g++ RUNTESTFLAGS=g++.dg='cpp/*'
>
> It also does c-c++-common/cpp/* but you might actually want that?
> And it's fast anyway.
>
>
> Segher

Thanks, but when I try with:
make -k check-gcc-g++ RUNTESTFLAGS=g++.dg='cpp/*'
I have the the following error:
make: *** No rule to make target `check-gcc-g++'.
I tried running:
make -k check RUNTESTFLAGS=g++.dg='cpp/*'
but I couldn't get the summary from those test and I had this kind of errors:
-----------------------------------------------------------------------------
Illegal Argument "g++.dg=cpp/*"
.
.
.
make[2]: *** [check-recursive] Error 1
make[2]: Target `check' not remade because of errors.
make[2]: Leaving directory
`/home/andres-tiraboschi/Desktop/gcc/build-5.2.0/x86_64-unknown-linux-gnu/libatomic'
make[1]: *** [check-target-libatomic] Error 2
make[1]: Target `check-target' not remade because of errors.
make[1]: Leaving directory `/home/andres-tiraboschi/Desktop/gcc/build-5.2.0'
make: *** [do-check] Error 2
make: Target `check' not remade because of errors.
-----------------------------------------------------------------------------

Also tried:
make -C gcc check-g++ RUNTESTFLAGS=g++.dg='cpp/*'

but I have the same:
Illegal Argument "g++.dg=cpp/*"

Maybe you have a clue about what I'm doing wrong.

Thanks,
Andrés.