[PATCH RFC] ARM: use -marm unconditionally for THUMB2_KERNEL=n builds

[Russell King - ARM Linux]

On Wed, May 27, 2015 at 11:42:07AM +0200, Uwe Kleine-König wrote:
> The only possible culprit is a compiler that doesn't understand -marm.
> My compiler collection only goes back to 4.0.3 which does work with this
> option. The use of cc-option to test for -marm was introduced in commit
> 5636810d6f17 ([ARM] 3982/2: Explicitly select 32-bit ARM ISA (-marm))
> back in 2006 when the minimal compiler version was already 3.3.

According to gcc 3.3's --target-help, it supports -mthumb, but not -marm.

What we could possibly do is to change the := to a plain =, and then
evaluate all the options together via:

KBUILD_CFLAGS :=$(KBUILD_CFLAGS)

after their final +=.

In any case, please don't add a after the =, I've found that certain gnu
make flavours like to collect all that white space up into the executed
command, which makes reading the verbose make output more annoying.  Rule
number one of modification: stick to the established style in the file,
even if it's wrong.  Do style modifications separately and uniformly.

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