Re: [PATCH] gcc: clamp gcc version to most highest specific header version available

[Joe Perches <joe@perches.com>]

On Fri, 2014-09-05 at 22:39 +0200, Hannes Frederic Sowa wrote:
> As announced in [1] gcc will increase its major number yearly but we don't
> need to include gcc version specific quirks for every version normally.
> 
> This patch allows to compile every kernel with all new versions of gcc
> without adding a specific compiler-gccX.h header. We do so by clamping
> the __GNUC__ version to the most specific version dependent header file.
> 
> If someone adds a new gccX.h file __GCC_CLAMP_VERSION_HEADER also needs
> to be modified.
> 
> The decision if chained including of header files (e.g. gcc5.h includes
> gcc4.h) is necessary or should be avoided can be postponed until more
> experience in using the official gcc release is gained.

I think the churn rate in the gcc compiler specific
#include headers will be low enough that a single
combined file should be acceptable.

Keeping all the gcc #defines together seems more
readable to me.

The trivial integration I did eliminated one
duplicate #define as well as that hack for
#include gcc_header(__GNUC__)