http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60304
Harald van Dijk <harald at gigawatt dot nl> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |harald at gigawatt dot nl --- Comment #2 from Harald van Dijk <harald at gigawatt dot nl> --- The warning is suppressed because it is supposedly from a system header (even though clearly, that is not the case) and including -Wsystem-headers on the command-line shows: $ gcc-run/bin/g++ -std=c++11 -c test.cc -Wsystem-headers In file included from /home/harald/gcc-run/include/c++/4.9.0/bits/atomic_base.h:36:0, from /home/harald/gcc-run/include/c++/4.9.0/atomic:41, from test.cc:2: test.cc: In function ‘int* foo()’: test.cc:3:21: warning: converting ‘false’ to pointer type ‘int*’ [-Wconversion-null] int * foo() {return false;} ^