Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation

On Tue, Dec 13, 2005 at 01:02:33AM -0800, Andrew Morton wrote:
> Andrew Morton <[email protected]> wrote:
> >
> > Thus far I have this:
> >
> 
> And this:
> 
> 
> From: Andrew Morton <[email protected]>
> 
> Remove various things which were checking for gcc-1.x and gcc-2.x compilers.

> --- devel/arch/arm/kernel/asm-offsets.c~remove-gcc2-checks	2005-12-13 00:51:14.000000000 -0800
> +++ devel-akpm/arch/arm/kernel/asm-offsets.c	2005-12-13 00:53:27.000000000 -0800
> @@ -23,18 +23,13 @@
>  #error Sorry, your compiler targets APCS-26 but this kernel requires APCS-32
>  #endif
>  /*
> - * GCC 2.95.1, 2.95.2: ignores register clobber list in asm().
>   * GCC 3.0, 3.1: general bad code generation.
>   * GCC 3.2.0: incorrect function argument offset calculation.
>   * GCC 3.2.x: miscompiles NEW_AUX_ENT in fs/binfmt_elf.c
>   *            (http://gcc.gnu.org/PR8896) and incorrect structure
>   *	      initialisation in fs/jffs2/erase.c
>   */
> -#if __GNUC__ < 2 || \
> -   (__GNUC__ == 2 && __GNUC_MINOR__ < 95) || \
> -   (__GNUC__ == 2 && __GNUC_MINOR__ == 95 && __GNUC_PATCHLEVEL__ != 0 && \
> -					     __GNUC_PATCHLEVEL__ < 3) || \
> -   (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
> +#if __GNUC__ < 2 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
>  #error Your compiler is too buggy; it is known to miscompile kernels.
>  #error    Known good compilers: 2.95.3, 2.95.4, 2.96, 3.3
>  #endif

Guess

#if __GNUC__ == 3 && __GNUC_MINOR__ < 3
#error Your compiler is too buggy; it is known to miscompile kernels.
#error    Known good compilers: 3.3, 3.4, 4.0
#endif

would be better.  __GNUC__ < 2 will certainly be errored about in other
places and it is bad to suggest compilers that are no longer supported
as known good ones.

	Jakub
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