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s390: allow to set gcc -mtune flag
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Wed, 30 Oct 2013 11:12:50 +0000 (12:12 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 31 Oct 2013 08:54:01 +0000 (09:54 +0100)
Add a new Kconfig choice group which allows to configure how gcc should
tune the generated code (via -mtune option).
By default the -mtune parameter will match the -march parameter.

This is a rather large patch, but I wouldn't know how to make this shorter
unfortunately.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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