Pass BUILD_HALF as a compiler define for dynamic_arch builds

Makefile.system

@@ -1124,6 +1124,10 @@ ifeq ($(USE_TLS), 1)
 CCOMMON_OPT += -DUSE_TLS
 endif
 
+ifeq ($(BUILD_HALF), 1)
+CCOMMON_OPT += -DBUILD_HALF
+endif
+
 CCOMMON_OPT += -DVERSION=\"$(VERSION)\"
 
 ifndef SYMBOLPREFIX

common_param.h

@@ -47,7 +47,7 @@ typedef struct {
   int dtb_entries;
   int offsetA, offsetB, align;
 
-#if 1
+#ifdef BUILD_HALF
   int shgemm_p, shgemm_q, shgemm_r;
   int shgemm_unroll_m, shgemm_unroll_n, shgemm_unroll_mn;