[Xen-devel] [PATCH v3] x86emul: fix test harness and fuzzer build dependencies

[Jan Beulich <jbeulich@xxxxxxxx>]

Commit fd35f32b4b ("tools/x86emul: Use struct cpuid_policy in the
userspace test harnesses") didn't account for the dependencies of
cpuid-autogen.h to potentially change between incremental builds. In
particular the harness has a "run" goal which is supposed to be usable
independently of the rest of the tools sub-tree building, and both the
harness and the fuzzer code are also supposed to be buildable
independently. Therefore a re-build of the generated header needs to
be triggered first, which is achieved by introducing a new top-level
target pattern (for just the "run" part for now).

Finally cpuid.o did not have any dependencies added for it.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
TBD: Something similar would be nice for building both tools/tests/*/
     and tools/fuzz/*/, but I'm uncertain whether respective top level
     targets build-tests-% and build-fuzz-% would be welcome.
---
v3: Introduce top level run-tests-% target.
v2.1: Split controversial parts from (hopefully) non-controversial ones.
v2: Guard $(MAKE) invocations by $(MAKELEVEL) checks.

--- a/Makefile
+++ b/Makefile
@@ -80,6 +80,9 @@ build-docs:
 test:
        $(MAKE) -C tools/python test
 
+run-tests-%: build-tools-public-headers tools/tests/%/
+       $(MAKE) -C tools/tests/$* run
+
 # For most targets here,
 #   make COMPONENT-TARGET
 # is implemented, more or less, by
--- a/tools/fuzz/x86_instruction_emulator/Makefile
+++ b/tools/fuzz/x86_instruction_emulator/Makefile
@@ -26,13 +26,15 @@ GCOV_FLAGS := --coverage
        $(CC) -c $(CFLAGS) $(GCOV_FLAGS) $< -o $@
 
 x86.h := $(addprefix $(XEN_ROOT)/tools/include/xen/asm/,\
-                     x86-vendors.h x86-defns.h msr-index.h)
+                     x86-vendors.h x86-defns.h msr-index.h) \
+         $(addprefix $(XEN_ROOT)/tools/include/xen/lib/x86/, \
+                     cpuid.h cpuid-autogen.h)
 x86_emulate.h := x86-emulate.h x86_emulate/x86_emulate.h $(x86.h)
 
 # x86-emulate.c will be implicit for both
 x86-emulate.o x86-emulate-cov.o: x86_emulate/x86_emulate.c $(x86_emulate.h)
 
-fuzz-emul.o fuzz-emulate-cov.o wrappers.o: $(x86_emulate.h)
+fuzz-emul.o fuzz-emulate-cov.o cpuid.o wrappers.o: $(x86_emulate.h)
 
 x86-insn-fuzzer.a: fuzz-emul.o x86-emulate.o cpuid.o
        $(AR) rc $@ $^
--- a/tools/tests/x86_emulator/Makefile
+++ b/tools/tests/x86_emulator/Makefile
@@ -280,10 +280,12 @@ $(call cc-option-add,HOSTCFLAGS-x86_64,H
 HOSTCFLAGS += $(CFLAGS_xeninclude) -I. $(HOSTCFLAGS-$(XEN_COMPILE_ARCH))
 
 x86.h := $(addprefix $(XEN_ROOT)/tools/include/xen/asm/,\
-                     x86-vendors.h x86-defns.h msr-index.h)
+                     x86-vendors.h x86-defns.h msr-index.h) \
+         $(addprefix $(XEN_ROOT)/tools/include/xen/lib/x86/, \
+                     cpuid.h cpuid-autogen.h)
 x86_emulate.h := x86-emulate.h x86_emulate/x86_emulate.h $(x86.h)
 
-x86-emulate.o test_x86_emulator.o evex-disp8.o wrappers.o: %.o: %.c $(x86_emulate.h)
+x86-emulate.o cpuid.o test_x86_emulator.o evex-disp8.o wrappers.o: %.o: %.c 
$(x86_emulate.h)
        $(HOSTCC) $(HOSTCFLAGS) -c -g -o $@ $<
 
 x86-emulate.o: x86_emulate/x86_emulate.c
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