tests/tcg/multiarch: add support for multiarch system tests

We can certainly support some common tests for system emulation that
make use of our minimal defined boot.S support. It will still be up to
individual architectures to ensure they build so we provide a
MULTIARCH_TESTS variable that they can tack onto TESTS themselves.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

tests/tcg/Makefile

@@ -96,6 +96,7 @@ else
 # build options for bare programs are usually pretty different. They
 # are expected to provide their own build recipes.
 -include $(SRC_PATH)/tests/tcg/minilib/Makefile.target
+-include $(SRC_PATH)/tests/tcg/multiarch/system/Makefile.softmmu-target
 -include $(SRC_PATH)/tests/tcg/$(TARGET_BASE_ARCH)/Makefile.softmmu-target
 ifneq ($(TARGET_BASE_ARCH),$(TARGET_NAME))
 -include $(SRC_PATH)/tests/tcg/$(TARGET_NAME)/Makefile.softmmu-target

tests/tcg/multiarch/system/Makefile.softmmu-target

+# -*- Mode: makefile -*-
+#
+# Multiarch system tests
+#
+# We just collect the tests together here and rely on the actual guest
+# architecture to add to the test dependancies and deal with the
+# complications of building.
+#
+
+MULTIARCH_SYSTEM_SRC=$(SRC_PATH)/tests/tcg/multiarch/system
+VPATH+=$(MULTIARCH_SYSTEM_SRC)
+
+MULTIARCH_TEST_SRCS=$(wildcard $(MULTIARCH_SYSTEM_SRC)/*.c)
+MULTIARCH_TESTS = $(patsubst $(MULTIARCH_SYSTEM_SRC)/%.c, %, $(MULTIARCH_TEST_SRCS))