Pavel Shevaev <pacha.shevaev@xxxxxxxxx> writes: > Folks, I'm using gcc-4.4.1(4.4.1-4ubuntu9 to be precise) on Ubuntu and > after trying to make PCH work properly for some time I found that > precompiled headers are not used if -c option used. Experimenting with > different options I discovered that it's the -fpch-preprocess option > which enables PCH in this case. > > Is it an expected behavior? If yes, maybe it should be documented here > http://gcc.gnu.org/onlinedocs/gcc/Precompiled-Headers.html in order to > save some time for others :) It is very likely that you are using ccache or distcc. Those tools first preprocess the C source code and then compile it. It's true that if you are preprocessing, you need to use the -fpch-preprocess option. However, -fpch-preprocess is not required if you do not preprocess, and omitting it should work fine when using gcc proper rathre than ccache or distcc. Ian
