[OE-core] [PATCH] feature-arm-thumb: Take ARM_INSTRUCTION_SET into account to decide thumb mode

[Khem Raj]

This will decouple the compiling in thumb mode from having thumb
capable cores.

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 .../conf/machine/include/arm/feature-arm-thumb.inc |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/meta/conf/machine/include/arm/feature-arm-thumb.inc b/meta/conf/machine/include/arm/feature-arm-thumb.inc
index b580168..533eab9 100644
--- a/meta/conf/machine/include/arm/feature-arm-thumb.inc
+++ b/meta/conf/machine/include/arm/feature-arm-thumb.inc
@@ -4,7 +4,10 @@
 # encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size)
 # but requires more instructions (140% for 70% smaller code) so may be
 # slower.
-TUNEVALID[thumb] = "Use thumb instructions instead of ARM"
+TUNEVALID[thumb] = "Use thumb instructions instead of ARM if ARM_INSTRUCTION_SET != arm"
+ARM_THUMB_M_OPT = "${@['-mthumb', '-mno-thumb'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) != 'arm']}"
+TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "thumb", "${ARM_THUMB_M_OPT}", "${ARM_THUMB_M_OPT}", d)}"
+
 TUNE_CCARGS += "${@bb.utils.contains("TUNE_FEATURES", "thumb", "-mthumb", "-mno-thumb", d)}"
 OVERRIDES .= "${@bb.utils.contains("TUNE_FEATURES", "thumb", ":thumb", "", d)}"
 
-- 
1.7.4.1