Messages in this thread | | | Date | Thu, 20 Dec 2001 11:30:21 +0100 (CET) | From | devik <> | Subject | Re: gcc 3.0.2/kernel details (-O issue) |
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> Well, you certainly won't get errors, because compiler optimizations > shouldn't change expected syntax.
not always true, inb() doesn't compile without -O for example.
> -O2 is the standard optimization level for the kernel; everything is > compiled via it. When developers test their code, nuances that the > optimization introduce are accepted. Removing the optimization may > break those expectations. Thus the kernel requires it.
I'm quite comfortable with the requirement, only I can't imagine code which depends on -O and -O2 difference. Inline assembly is handled by compiler so it should not break things .. Maybe externaly linked assembly code ? But optimization level should not change register usage in calling convention .. Please can you give me example which kind of code breaks those expectations ?
Thanks, Martin
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