configure: do not define or use the CPP variable

Just hardcode $(CC) -E, it should be enough.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220517092616.1272238-2-pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220527153603.887929-13-alex.bennee@linaro.org>

configure

@@ -376,7 +376,6 @@ fi
 ar="${AR-${cross_prefix}ar}"
 as="${AS-${cross_prefix}as}"
 ccas="${CCAS-$cc}"
-cpp="${CPP-$cc -E}"
 objcopy="${OBJCOPY-${cross_prefix}objcopy}"
 ld="${LD-${cross_prefix}ld}"
 ranlib="${RANLIB-${cross_prefix}ranlib}"
@@ -2014,7 +2013,6 @@ echo "CC=$cc" >> $config_host_mak
 echo "AR=$ar" >> $config_host_mak
 echo "AS=$as" >> $config_host_mak
 echo "CCAS=$ccas" >> $config_host_mak
-echo "CPP=$cpp" >> $config_host_mak
 echo "OBJCOPY=$objcopy" >> $config_host_mak
 echo "LD=$ld" >> $config_host_mak
 echo "QEMU_CFLAGS=$QEMU_CFLAGS" >> $config_host_mak
@@ -2257,7 +2255,6 @@ preserve_env() {
 preserve_env AR
 preserve_env AS
 preserve_env CC
-preserve_env CPP
 preserve_env CFLAGS
 preserve_env CXX
 preserve_env CXXFLAGS

pc-bios/optionrom/Makefile

@@ -50,7 +50,7 @@ override LDFLAGS = -m $(LD_I386_EMULATION) -T $(SRC_DIR)/flat.lds
 pvh.img: pvh.o pvh_main.o
 
 %.o: %.S
-	$(call quiet-command,$(CPP) $(CPPFLAGS) -c -o - $< | $(AS) $(ASFLAGS) -o $@,"AS","$@")
+	$(call quiet-command,$(CC) $(CPPFLAGS) -E -o - $< | $(AS) $(ASFLAGS) -o $@,"AS","$@")
 
 %.o: %.c
 	$(call quiet-command,$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@,"CC","$@")