Since netbeans supports different C++ compilers I tried it with Emscripten (1.37) compiler.

By default IDE generates build target for my lib like:
${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/my-common-lib.a: ${OBJECTFILES}
	${MKDIR} -p ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}
	${RM} ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/my-common-lib.a
	${AR} -r ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/my-common-lib.a ${OBJECTFILES}

but Emscripten llvw-ar does not support option -r which is added by default. And after successful compilation I get an error:

llvm-ar: Unknown command line argument '-r'.

I have no possibility to remove this option, because file generates automatically. 

Need to remove this default option '-r' or make it configurable, but not default.