Messages in this thread | | | Date | Thu, 7 Sep 2006 02:37:58 +0200 | From | Adrian Bunk <> | Subject | Re: [2.6 patch] re-add -ffreestanding |
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On Thu, Sep 07, 2006 at 02:05:59AM +0200, Roman Zippel wrote: > Hi, > > On Thu, 7 Sep 2006, Adrian Bunk wrote: > > > it's correct, since with -ffreestanding gcc no longer has the right to > > assume it had a full libc available. > > BS, even without it gcc can't make such assumption. > There is not a single optimization, which would be invalid in a kernel > environment and would be "fixed" by this option, so please stop this > nonsense.
You are wrong.
Section 5.1.2.2.2 of ISO/IEC 9899:1999 says: In a hosted environment, a program may use all functions, macros, type definitions, and objects described in the library clause (clause 7).
Since a hosted environment means gcc+libc, it's therefore clear that gcc can assume the presence of a full libc if gcc isn't told that it's used as a freestanding environment.
> bye, Roman
cu Adrian
--
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