src/Makefile: build util.c separately for makeguids

util.c needs to be built twice when cross-compiling:
for the build machine to be able to link with
makeguids which then runs during the same build,
and then for the actual target.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>

src/Makefile

@@ -28,10 +28,13 @@ EFIVAR_OBJECTS = $(patsubst %.S,%.o,$(patsubst %.c,%.o,$(EFIVAR_SOURCES)))
 EFISECDB_SOURCES = efisecdb.c guid-symbols.c secdb-dump.c util.c
 EFISECDB_OBJECTS = $(patsubst %.S,%.o,$(patsubst %.c,%.o,$(EFISECDB_SOURCES)))
 GENERATED_SOURCES = include/efivar/efivar-guids.h guid-symbols.c
-MAKEGUIDS_SOURCES = makeguids.c util.c
+MAKEGUIDS_SOURCES = makeguids.c util-makeguids.c
 MAKEGUIDS_OBJECTS = $(patsubst %.S,%.o,$(patsubst %.c,%.o,$(MAKEGUIDS_SOURCES)))
 MAKEGUIDS_OUTPUT = $(GENERATED_SOURCES) guids.lds
 
+util-makeguids.c : util.c
+	cp util.c util-makeguids.c
+
 ALL_SOURCES=$(LIBEFISEC_SOURCES) $(LIBEFIBOOT_SOURCES) $(LIBEFIVAR_SOURCES) \
 	    $(MAKEGUIDS_SOURCES) $(GENERATED_SOURCES) $(EFIVAR_SOURCES) \
 	    $(sort $(wildcard include/efivar/*.h))