when building for arm as thumb2 code, also request assembly as thumb
all assembly is now thumb2-compatible. on existing targets this is at
best a size optimization, but it will also facilitate porting to
thumb2-isa-only arm variants.
diff --git a/configure b/configure
index 81e90f7..c2db298 100755
--- a/configure
+++ b/configure
@@ -602,6 +602,10 @@
fi
if test "$ARCH" = "arm" ; then
+if trycppif __thumb2__ "$t" ; then
+tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always
+tryflag CFLAGS_AUTO -Wa,-mthumb
+fi
trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb
trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf
# Versions of clang up until at least 3.8 have the wrong constraint codes