toolset darwin-4.7 error: unrecognized option -no-cpp-precomp

[Julian Gonggrijp]

I installed gcc 4.7 from macports and added the following to my user-config.jam:

using darwin
    : 4.7
    : /opt/local/bin/g++-mp-4.7
    ;

Now when I run

$ b2 darwin-4.7

, the build process will stop at compilation stage because of an error:

g++-mp-4.7: error: unrecognized command line option '-no-cpp-precomp'

-no-cpp-precomp was already unrecognized in darwin-4.4, but then it only caused a warning without further obstructing the build process. I don't know at what version of darwin-gcc this changed into an error.

If I repeat the displayed command without the -no-cpp-precomp option it works fine. Linking also works without errors.

[Daniel James]

I removed it from trunk in [75659]. I assumed it would have been merged by now, but I think it can safely cherry-picked if that's okay.

[stoffle+boost@…]

I too am having this problem (with gcc 4.6, from macports). Is there a workaround that doesn't involve modifying the boost jamfiles?

[James Harris <stoffle+boost@…>]

Also, I'm not sure of the purpose of this file ​http://svn.boost.org/svn/boost/trunk/tools/build/v2/tools/darwin.py but does it need to be modified as well?

[anonymous]

How to solve this problem? I am getting this with gcc-4.7.2 installed from source.

[Daniel James]

I think it was fixed in boost 1.50, are you using an old version of boost? If you are then look for -no-cpp-precomp in tools/build/v2/tools/darwin.jam and remove it (as in the change I linked to above).

[jstroud@…]

For later versions of OS X, clang allows the -no-cpp-precomp flag, so link c++ to /usr/bin/clang or set $CXX to /usr/bin/clang as necessary. This worked for me to overcome the error.