On Thu, Nov 27, 2008 at 11:21:38AM +0100, Andrzej Giniewicz wrote: > Hi - it's my first time on that list, I hope I choose good one as gcc > have really quite number of different mailing lists :) > > lately I hit very strange behaviour, i.e. the app I wanted to build > works when I build it with -O0 but crash at -O1, I wanted to eliminate > flags that work as I usually do, by doing -O0 and adding all flags > that are on -O1 and aren't on -O0, I got their list using standard > recommended by manual way: > > g++ -c -Q -O0 --help=optimize > 0.flags > g++ -c -Q -O1 --help=optimize > 1.flags > diff 0.flags 1.flags | grep enabled Just for reference, there are optimizations that are done based on the optimization level, and not on particular -f switches. -- Michael Meissner, IBM 4 Technology Place Drive, MS 2203A, Westford, MA, 01886, USA meissner@xxxxxxxxxxxxxxxxxx
