On Wed, Jul 09, 2008 at 06:32:12PM +0200, Sam Ravnborg wrote: > So the expalnation seems that gcc for mips define much more > than the usual gcc does. > My gcc define 76 symbols for i386. > > And we use this stuff in the kernel. How much of it do we really use? Let's see - on i386 gcc-4.1.2 I see 79 symbols. 64 simply never occur in the tree. At all. Out of remaining 15, we have __GNUC__, __GNUC_MAJOR__, __GNUC_PATCHLEVEL__ - provided by sparse. __STDC__: few users, provided by sparse. __SIZE_TYPE__: one odd user, defined by sparse anyway __PTRDIFF_TYPE__: one odd user, defined by sparse anyway __linux__ - few users, explicitly added in top-level Makefile linux - 3 users. Defined in top-level Makefile. unix - no real users (some instances, of course, but none outside of comments, #include pathnames and string constants). Defined in top-level Makefile, anyway. __USER_LABEL_PREFIX__, __REGISTER_PREFIX__ - arch/m68knommu/lib/*.S; not a sparse fodder anyway *and* defaults are given in files themselves. __ELF__: arch/alpha/boot/tools/objstrip.c (userland helper, actually, *and* misplaced there; it's used as a proxy for type of kernel image) __i386__: a bunch __i386: one user, redundant (__i386__ *and* i386 in the same #if) i386: 3 users besides the aforementioned one. So... Only 3 symbols out of the entire bunch are arch-dependent *and* not provided by sparse itself. Absolute majority of the rest is never ever used in the tree. I very much doubt that mips situation is seriously different...
