On Thu, Mar 10, 2016 at 7:33 AM, René J.V. <rjvber...@gmail.com> wrote: > On Wednesday March 09 2016 20:48:19 Jack Howarth wrote: >>> Why? My understanding is that the optimizations for -Os are equivalent >>> to -O2 with the emphasis on size reduction. The additional >>> optimizations from -O2 to -O3 would seem sufficient to produce a 10% >>> execution optimization, no? >> > > Actually, this point is moot : -Os is used only on PPC machines from what I > can see. Other architectures use whatever optimisation the build system > decides to use (which is an interesting question when that system is based on > CMake and you use one of the built-in BUILD_TYPE presets). >
A simple test with 'sudo port -d -s build llvm-3.8' reveals that -Os is in fact used during the compiles on Intel. This is unsurprising as MacPorts has standardized on -Os. CFLAGS='-pipe -Os' CXXFLAGS='-pipe -Os -std=c++11 -stdlib=libc++' F90FLAGS='-pipe -Os -m64' FCFLAGS='-pipe -Os -m64' FFLAGS='-pipe -Os' OBJCFLAGS='-pipe -Os' OBJCXXFLAGS='-pipe -Os -stdlib=libc++' > R. _______________________________________________ macports-dev mailing list macports-dev@lists.macosforge.org https://lists.macosforge.org/mailman/listinfo/macports-dev
