$ portageq envvar -v CFLAGS CXXFLAGS CFLAGS='-O2 -pipe -march=k8 -Wimplicit-function-declaration' CXXFLAGS='-O2 -pipe -march=k8' as you can see, i have slightly diff CFLAGS/CXXFLAGS because the warning i use here isnt valid for C++ ... when building gnash, i see crap like below ... in other words, the ebuild or build system (i didnt really look) wrongly uses $CFLAGS for C++ code instead of $CXXFLAGS x86_64-pc-linux-gnu-g++ -DHAVE_CONFIG_H -I. -I. -I.. -I.. -I. -I.. -I../libbase -I/usr/include -I/usr/include/SDL -DQT_THREAD_SUPPORT -D_REENTRANT -O2 -pipe -march=k8 -Wimplicit-function-declaration -ansi -Wall -I/usr/include/SDL -I.. -I. -I.. -I../libbase -I/usr/include -I/usr/include/SDL -O2 -pipe -march=k8 -ansi -Wall -MT tqt.lo -MD -MP -MF .deps/tqt.Tpo -c tqt.cpp -fPIC -DPIC -o .libs/tqt.o cc1plus: warning: command line option "-Wimplicit-function-declaration" is valid for C/ObjC but not for C++ cc1plus: warning: command line option "-Wimplicit-function-declaration" is valid for C/ObjC but not for C++
Thanks I made and committed a patch for your issue also reported upstream: http://savannah.gnu.org/bugs/?func=detailitem&item_id=17049
