Messages in this thread | | | Date | Fri, 5 Sep 2003 13:19:29 -0400 | From | Jakub Jelinek <> | Subject | Re: [PATCH] Use -fno-unit-at-a-time if gcc supports it |
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On Fri, Sep 05, 2003 at 05:17:00PM +0200, Andreas Jaeger wrote: > Linus Torvalds <torvalds@osdl.org> writes: > > > On Fri, 5 Sep 2003, Andi Kleen wrote: > >> > >> Unfortunately the kernel doesn't compile with unit-at-a-time currently, > >> it cannot tolerate the reordering of functions in relation to inline > >> assembly. > > > > What is the problem exactly? Is it the exception table getting unordered? > > We _could_ just sort it at boot-time (or, even better, at build time after > > the final link) instead... > > The problem is that unit-at-a-time sees all functions used and finds > some static functions/variables that are not called anywhere and > therefore drops them, making a smaller binary. Since GCC does not > look into inline assembler, anything referenced from inline assembler > only, will be treated as not used and therefore removed. > > You have to options: > - use attribute ((used)) (implemented since GCC 3.2) to tell GCC that > a function/variable should never be removed
To be precise, implemented since GCC 3.2 for functions and since GCC 3.3 for variables.
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