1 files changed, 30 insertions, 0 deletions
diff --git a/external/poky/meta/conf/machine/include/arm/feature-arm-thumb.inc b/external/poky/meta/conf/machine/include/arm/feature-arm-thumb.inc
new file mode 100644
index 00000000..0b47ccad
--- /dev/null
+++ b/external/poky/meta/conf/machine/include/arm/feature-arm-thumb.inc
@@ -0,0 +1,30 @@
+
+TUNEVALID[thumb] = "Support Thumb instructions"
+
+ARM_THUMB_SUFFIX = "${@bb.utils.contains_any('TUNE_FEATURES', 'armv4 armv5 armv6', 't', 't2', d)}"
+
+# If the device supports ARM, then respect ARM_THUMB_OPT (which can be "arm" or "thumb")
+# If the device doesn't support ARM, then always set "thumb" even when
+# some recipe explicitly sets ARM_INSTRUCTION_SET to "arm"
+ARM_THUMB_OPT = "${@['arm', 'thumb'][d.getVar('ARM_INSTRUCTION_SET') == 'thumb']}"
+ARM_M_OPT = "${@bb.utils.contains('TUNE_FEATURES', 'arm', '${ARM_THUMB_OPT}', 'thumb', d)}"
+
+python () {
+    if bb.utils.contains('TUNE_FEATURES', 'thumb', False, True, d):
+        return
+    selected = d.getVar('ARM_INSTRUCTION_SET')
+    if selected == None:
+        return
+    used = d.getVar('ARM_M_OPT')
+    if selected != used:
+        pn = d.getVar('PN')
+        bb.warn("Recipe '%s' selects ARM_INSTRUCTION_SET to be '%s', but tune configuration overrides it to '%s'" % (pn, selected, used))
+}
+
+TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' -m${ARM_M_OPT}', '', d)}"
+
+# Add suffix from ARM_THUMB_SUFFIX only if after all this we still set ARM_M_OPT to thumb
+ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '${ARM_THUMB_SUFFIX}', '', d) if d.getVar('ARM_M_OPT') == 'thumb' else ''}"
+
+# what about armv7m devices which don't support -marm (e.g. Cortex-M3)?
+TARGET_CC_KERNEL_ARCH += "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '-mno-thumb-interwork -marm', '', d)}"