http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59365
--- Comment #7 from djfd at mail dot ru --- just noticed. there is ./config/mt-ospace file with the contents # Build libraries optimizing for space, not speed. CFLAGS_FOR_TARGET = -g -Os CXXFLAGS_FOR_TARGET = -g -Os it is resulting to next lines in Makefile: #### host and target specific makefile fragments come in here. CXXFLAGS_FOR_TARGET = $(CXXFLAGS) -D_GNU_SOURCE # Build libraries optimizing for space, not speed. CFLAGS_FOR_TARGET = -g -Os CXXFLAGS_FOR_TARGET = -g -Os ### BUT at that moment we have already C(XX)?FLAGS_for target set earlier: CFLAGS_FOR_TARGET = -g --sysroot=/ CXXFLAGS_FOR_TARGET = -g --sysroot=/ thus, when we choose to optimize target libraries for size, our custom flags will be overwritten. Maybe it would be better to have ./config/mt-ospace like this: # Build libraries optimizing for space, not speed. CFLAGS_FOR_TARGET += -g -Os CXXFLAGS_FOR_TARGET += -g -Os (append instead of replace)
