[kvm-unit-tests PATCH v2 1/9] (arm|powerpc|s390x): Makefile: Fix .aux.o generation

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Using all prerequisites for the source file results in the build
dying on the second time around with:

gcc: fatal error: cannot specify ‘-o’ with ‘-c’, ‘-S’ or ‘-E’ with multiple files

This is due to auxinfo.h becoming a prerequisite after the first
build recorded the dependency.

Use the first prerequisite for this recipe.

Fixes: f2372f2d49135 ("(arm|powerpc|s390x): Makefile: add `%.aux.o` target")
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
 arm/Makefile.common     | 2 +-
 powerpc/Makefile.common | 2 +-
 s390x/Makefile          | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arm/Makefile.common b/arm/Makefile.common
index 54cb4a63..c2ee568c 100644
--- a/arm/Makefile.common
+++ b/arm/Makefile.common
@@ -71,7 +71,7 @@ FLATLIBS = $(libcflat) $(LIBFDT_archive) $(libeabi)
 
 ifeq ($(CONFIG_EFI),y)
 %.aux.o: $(SRCDIR)/lib/auxinfo.c
-	$(CC) $(CFLAGS) -c -o $@ $^ \
+	$(CC) $(CFLAGS) -c -o $@ $< \
 		-DPROGNAME=\"$(@:.aux.o=.efi)\" -DAUXFLAGS=$(AUXFLAGS)
 
 %.so: EFI_LDFLAGS += -defsym=EFI_SUBSYSTEM=0xa --no-undefined
diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common
index 483ff648..eb88398d 100644
--- a/powerpc/Makefile.common
+++ b/powerpc/Makefile.common
@@ -48,7 +48,7 @@ cflatobjs += lib/powerpc/smp.o
 OBJDIRS += lib/powerpc
 
 %.aux.o: $(SRCDIR)/lib/auxinfo.c
-	$(CC) $(CFLAGS) -c -o $@ $^ -DPROGNAME=\"$(@:.aux.o=.elf)\"
+	$(CC) $(CFLAGS) -c -o $@ $< -DPROGNAME=\"$(@:.aux.o=.elf)\"
 
 FLATLIBS = $(libcflat) $(LIBFDT_archive)
 %.elf: CFLAGS += $(arch_CFLAGS)
diff --git a/s390x/Makefile b/s390x/Makefile
index e64521e0..b72f7578 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -177,7 +177,7 @@ lds-autodepend-flags = -MMD -MF $(dir $*).$(notdir $*).d -MT $@
 	$(CPP) $(lds-autodepend-flags) $(CPPFLAGS) -P -C -o $@ $<
 
 %.aux.o: $(SRCDIR)/lib/auxinfo.c
-	$(CC) $(CFLAGS) -c -o $@ $^ -DPROGNAME=\"$(@:.aux.o=.elf)\"
+	$(CC) $(CFLAGS) -c -o $@ $< -DPROGNAME=\"$(@:.aux.o=.elf)\"
 
 .SECONDEXPANSION:
 %.elf: $(FLATLIBS) $(asmlib) $(SRCDIR)/s390x/flat.lds $$(snippets-obj) $$(snippet-hdr-obj) %.o %.aux.o
-- 
2.42.0





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