Re: [PATCH v3 03/10] compiler-gcc{3,4}.h: Use GCC_VERSION macro

Borislav Petkov
2012-10-24T19:05:55Z

On Wed, Oct 24, 2012 at 11:33:54AM -0500, danielfsantos@att.net wrote:
> Using GCC_VERSION reduces complexity, is easier to read and is GCC's
> recommended mechanism for doing version checks. (Just don't ask me why
> they didn't define it in the first place.) This also makes it easy to
> merge compiler-gcc{,3,4}.h should somebody want to.
>
> Signed-off-by: Daniel Santos <daniel.santos@pobox.com>
> Acked-by: David Rientjes <rientjes@google.com>
> ---
> include/linux/compiler-gcc3.h | 8 ++++----
> include/linux/compiler-gcc4.h | 14 +++++++-------
> 2 files changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
> index 37d4124..7d89feb 100644
> --- a/include/linux/compiler-gcc3.h
> +++ b/include/linux/compiler-gcc3.h
> @@ -2,22 +2,22 @@
> #error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
> #endif
>
> -#if __GNUC_MINOR__ < 2
> +#if GCC_VERSION < 30200
> # error Sorry, your compiler is too old - please upgrade it.
> #endif
>
> -#if __GNUC_MINOR__ >= 3
> +#if GCC_VERSION >= 30300
> # define __used __attribute__((__used__))
> #else
> # define __used __attribute__((__unused__))
> #endif
>
> -#if __GNUC_MINOR__ >= 4
> +#if GCC_VERSION >= 30400
> #define __must_check __attribute__((warn_unused_result))
> #endif
>
> #ifdef CONFIG_GCOV_KERNEL
> -# if __GNUC_MINOR__ < 4
> +# if GCC_VERSION < 30400
> # error "GCOV profiling support for gcc versions below 3.4 not included"
> # endif /* __GNUC_MINOR__ */
> #endif /* CONFIG_GCOV_KERNEL */
> diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
> index 8914293..9755029 100644
> --- a/include/linux/compiler-gcc4.h
> +++ b/include/linux/compiler-gcc4.h
> @@ -4,7 +4,7 @@
>
> /* GCC 4.1.[01] miscompiles __weak */
> #ifdef __KERNEL__
> -# if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
> +# if GCC_VERSION >= 40100 && GCC_VERSION <= 40101
> # error Your version of gcc miscompiles the __weak directive
> # endif
> #endif
> @@ -13,11 +13,11 @@
> #define __must_check __attribute__((warn_unused_result))
> #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
>
> -#if __GNUC_MINOR__ > 0
> +#if GCC_VERSION >= 40100

I can't seem to recall so did we explain already why ">= 40100" instead
of "> 40000"?

I mean, it is the same, but still...

Thanks.

--
Regards/Gruss,
Boris.