On Fri, 22 Mar 2013 10:52:56 -0400, valdis.kletni...@vt.edu said: > No debug information is stripped by -O2. Debug information isn't emitted if > you don't compile with -g. At one time, long ago (quite possibly literally > "before you were born" for some of the younger readers on the list), gcc was > unable to generate -g output if the optimizer was invoked. But that was > last century (gcc 2.95 era).
GCC 4.8 was officially released today (since I sent the previous note). >From the release notes: "A new general optimization level, -Og, has been introduced. It addresses the need for fast compilation and a superior debugging experience while providing a reasonable level of runtime performance. Overall experience for development should be better than the default optimization level -O0." The current Linus tree does build with 4.8. I do *not* know if earlier releases build correctly (or how far back), nor if -Og is sufficient optimization to allow correct kernel functioning. But it's something to look at.
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