Add CPU variable in Makefiles.
diff --git a/Makefile.gcc b/Makefile.gcc
index 3bec4a3..660dcdc 100644
--- a/Makefile.gcc
+++ b/Makefile.gcc
@@ -32,9 +32,11 @@
# $ /path/to/qemu -L /path/to/sysroot/lib compute_ref.gccarm
# $ diff stm-arm-neon.gccarm ref-rvct-neon.txt
+CPU=cortex-a9
+
# GCC/ARM cross compiler
CC.gccarm := arm-none-eabi-gcc
-CFLAGS.gccarm := -g -Wall -mcpu=cortex-a9 -mfloat-abi=hard -mfpu=neon -Wno-unused-variable -Wno-unused-function -ffast-math
+CFLAGS.gccarm := -g -Wall -mcpu=$(CPU) -mfloat-abi=hard -mfpu=neon -Wno-unused-variable -Wno-unused-function -ffast-math
LD.gccarm := $(CC.gccarm)
LDFLAGS.gccarm := $(CFLAGS.gccarm)
@@ -75,7 +77,7 @@
diff $(REFGCCARM) ref-rvct-neon.txt
SIM=qemu-system-arm
-SIMFLAGS=-cpu cortex-a9 -semihosting -nographic -kernel
+SIMFLAGS=-cpu $(CPU) -semihosting -nographic -kernel
$(REFGCCARM): compute_ref.gccarm
$(SIM) $(SIMFLAGS) $^