[PATCH] tools/fuzz: use vpath uniformly for access to hypervisor library code

[Jan Beulich <jbeulich@xxxxxxxx>]

It's not quite clear why for libelf and the emulator we use symlink-ing,
while elsewhere we use vpath. Do so for these two as well, thus also
eliminating the need for custom -iquote options and custom cleaning.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Of course for the emulator fuzzer we could go farther and use vpath also
for the references into the test harness dir as well as the core emulator
one.

--- a/tools/fuzz/libelf/Makefile
+++ b/tools/fuzz/libelf/Makefile
@@ -1,17 +1,15 @@
 XEN_ROOT = $(CURDIR)/../../..
 include $(XEN_ROOT)/tools/Rules.mk
 
+vpath %.c $(XEN_ROOT)/xen/common/libelf
+
 LIBELF_OBJS := libelf-tools.o libelf-loader.o libelf-dominfo.o
 
-CFLAGS += -iquote ../../../xen/common/libelf
 $(LIBELF_OBJS): CFLAGS += -Wno-pointer-sign
 $(LIBELF_OBJS): CFLAGS += -DFUZZ_NO_LIBXC $(CFLAGS_xeninclude)
 
 libelf-fuzzer.o: CFLAGS += $(CFLAGS_xeninclude)
 
-$(LIBELF_OBJS:.o=.c): libelf-%.c: ../../../xen/common/libelf/libelf-%.c FORCE
-       ln -nsf $< $@
-
 libelf.a: libelf-fuzzer.o $(LIBELF_OBJS)
        $(AR) rc $@ $^
 
@@ -30,7 +28,7 @@ distclean: clean
 
 .PHONY: clean
 clean:
-       rm -f *.o .*.d *.a *-libelf-fuzzer $(LIBELF_OBJS:.o=.c)
+       rm -f *.o .*.d *.a *-libelf-fuzzer
 
 .PHONY: install
 install: all
--- a/tools/fuzz/x86_instruction_emulator/Makefile
+++ b/tools/fuzz/x86_instruction_emulator/Makefile
@@ -9,8 +9,7 @@ x86-insn-fuzz-all:
 endif
 
 # Add libx86 to the build
-%.c: $(XEN_ROOT)/xen/lib/x86/%.c FORCE
-       ln -nsf $< $@
+vpath %.c $(XEN_ROOT)/xen/lib/x86
 
 x86_emulate: FORCE
        mkdir -p $@
@@ -25,7 +24,6 @@ x86_emulate/%.h: x86_emulate ;
        ln -nsf $< $@
 
 CFLAGS += $(CFLAGS_xeninclude) -D__XEN_TOOLS__ -iquote .
-cpuid.o: CFLAGS += -iquote $(XEN_ROOT)/xen/lib/x86
 
 GCOV_FLAGS := --coverage
 %-cov.o: %.c
@@ -72,7 +70,7 @@ distclean: clean
 clean:
        rm -f *.a *.o $(DEPS_RM) *.gcda *.gcno *.gcov
        rm -f afl-harness afl-harness-cov libfuzzer-harness
-       rm -rf x86_emulate x86-emulate.c x86-emulate.h wrappers.c cpuid.c
+       rm -rf x86_emulate x86-emulate.c x86-emulate.h wrappers.c
 
 .PHONY: install
 install: all