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kernel: only optimized for size if small_flash

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Add a new config option to allow to select the default compile
optimization level for the kernel.

Select the optimization for size by default if the small_flash feature is
set. Otherwise "Optimize for performance" is set.

Add the small_flash feature flag to all (sub)targets which had the
optimization for size in their default kernel config.

Remove CC_OPTIMIZE_FOR_* symbols from all kernel configs to apply the new
setting.

Exceptions to the above are:

  - lantiq, where the optimization for size is only required for the
    xway_legacy subtarget but was set for the whole target
  - mediatek, ramips/mt7620 & ramips/mt76x8 where boards should have
    plenty of space and an optimization for size doesn't make much sense
  - rb532, which has 128MByte flash

Signed-off-by: Mathias Kresin <dev@kresin.me>
This commit is contained in:
Mathias Kresin 2018-07-09 20:48:56 +02:00
parent 621fa91a82
commit cf7154db07
29 changed files with 30 additions and 40 deletions
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2
target/linux/ramips/rt3883/target.mk
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@ -4,7 +4,7 @@
SUBTARGET:=rt3883
BOARDNAME:=RT3662/RT3883 based boards
FEATURES+=usb pci
FEATURES+=usb pci small_flash
CPU_TYPE:=74kc
DEFAULT_PACKAGES += kmod-rt2800-pci kmod-rt2800-soc wpad-mini