rust-cross/rust-common: Merge arm target handling code to fix cross-canadian

rust-cross had special handling for armv7 targets but we also need this
for cross-canadian. Merge the code into the main function so everything is
consistent.

Also then fix the arm definition to be arm-eabi since ABI is correctly
being looked up.

(From OE-Core rev: 0adada8111c17e8e5a7c32cef86bdb8e7dfd79d3)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ff3c3dbbd2bf1bb7bb70b55cca203e9eedcf14a8)
Signed-off-by: Jermain Horsman <jermain.horsman@nedap.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-devtools/rust/rust-common.inc

@@ -297,6 +297,12 @@ def rust_gen_target(d, thing, wd, features, cpu, arch, abi=""):
     sys = sys_for(d, thing)
     prefix = prefix_for(d, thing)
 
+    if thing == "TARGET":
+        abi = d.getVar('ABIEXTENSION')
+        # arm and armv7 have different targets in llvm
+        if arch == "arm" and target_is_armv7(d):
+            arch = 'armv7'
+
     rust_arch = oe.rust.arch_to_rust_arch(arch)
 
     if abi:

meta/recipes-devtools/rust/rust-cross.inc

@@ -8,15 +8,10 @@ python do_rust_gen_targets () {
         features = ""
         cpu = "generic"
         arch = d.getVar('{}_ARCH'.format(thing))
-        abi = ""
         if thing is "TARGET":
-            abi = d.getVar('ABIEXTENSION')
-            # arm and armv7 have different targets in llvm
-            if arch == "arm" and target_is_armv7(d):
-                arch = 'armv7'
             features = d.getVar('TARGET_LLVM_FEATURES') or ""
             cpu = d.getVar('TARGET_LLVM_CPU')
-        rust_gen_target(d, thing, wd, features, cpu, arch, abi)
+        rust_gen_target(d, thing, wd, features, cpu, arch)
 }
 
 # Otherwise we'll depend on what we provide