CXXFLAGS="-march=native -O2 -g0" emerge -1 =net-analyzer/nethogs-0.8.0-r3 does not respect CXXFLAGS: [...] x86_64-pc-linux-gnu-g++ -O2 -pipe -Wall -Wextra -c packet.cpp x86_64-pc-linux-gnu-g++ -O2 -pipe -Wall -Wextra -c connection.cpp x86_64-pc-linux-gnu-g++ -O2 -pipe -Wall -Wextra -c process.cpp x86_64-pc-linux-gnu-g++ -O2 -pipe -Wall -Wextra -c refresh.cpp x86_64-pc-linux-gnu-gcc -O2 -pipe -Wall -Wextra -c decpcap.c [...]
Fixed in -r4. Thanks for the report.