migration-test: Only generate a single target architecture

Several changes:
- We only allow generate header "inside" the tree.  Why?  Because we
  need to connit the result, so it makes no sense to generate them on
  the build dir.
- We only generate a single target each time.  Getting all the
  cross-compilers correctly is an impossible task.  So know you do:
     make -C tests/migration $target (native)
     make CROSS_PREFIX=foo- -C tests/migratiion $target (cross)
  And you are done.

- If we are building out of tree, we have no data about if we are
  cross-compile or whatever.  So instead of guess what is happening,
  just do what I pointed on previous point.

Signed-off-by: Juan Quintela <[email protected]>
Message-Id: <20180913132313[email protected]>
Signed-off-by: Dr. David Alan Gilbert <[email protected]>

diff --git a/tests/migration/Makefile b/tests/migration/Makefile
index ff726ed7dd55340e33ceb2f426b12f398e7ffbce..13e99b1692fa993bf80919e6e2da2d60116b0f00 100644 (file)
--- a/tests/migration/Makefile
+++ b/tests/migration/Makefile
@@ -9,6 +9,19 @@ TARGET_LIST = i386 aarch64 s390x
 
 SRC_PATH = ../..
 
+.PHONY: help $(TARGET_LIST)
+help:
+       @echo "Create migration guest includes.  We generate a binary."
+       @echo "And then convert that binary to an include file that can be"
+       @echo "run in a guest."
+       @echo "Possible operations are:"
+       @echo
+       @echo " $(MAKE) clean                Remove all intermediate files"
+       @echo " $(MAKE) target               Generate for that target"
+       @echo " $(MAKE) CROSS_PREFIX=... target"
+       @echo "                              Cross-compile than target"
+       @echo " Possible targets are: $(TARGET_LIST)"
+
 override define __note
 /* This file is automatically generated from the assembly file in
  * tests/migration/$@. Edit that file and then run "make all"
@@ -18,16 +31,8 @@ override define __note
 endef
 export __note
 
-find-arch-cross-cc = $(lastword $(shell grep -h "CROSS_CC_GUEST=" $(wildcard $(SRC_PATH)/$(patsubst i386,*86*,$(1))-softmmu/config-target.mak) /dev/null))
-parse-cross-prefix = $(subst gcc,,$(patsubst cc,gcc,$(patsubst CROSS_CC_GUEST="%",%,$(call find-arch-cross-cc,$(1)))))
-gen-cross-prefix = $(patsubst %-,CROSS_PREFIX=%-,$(call parse-cross-prefix,$(1)))
-
-.PHONY: all $(TARGET_LIST)
-
-all: $(TARGET_LIST)
-
 $(TARGET_LIST):
-       $(MAKE) -C $@ $(call gen-cross-prefix,$@)
+       $(MAKE) CROSS_PREFIX=$(CROSS_PREFIX) -C $@
 
 clean:
        for target in $(TARGET_LIST); do \