Makefile: rm u-boot.cfg dependencies are missing

[platform/kernel/u-boot.git] / scripts / Makefile.spl

diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index d0d73d3..5a7f79c 100644 (file)
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -216,6 +216,17 @@ quiet_cmd_cpp_cfg = CFG     $@
 cmd_cpp_cfg = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
        -DDO_DEPS_ONLY -D__ASSEMBLY__ -x assembler-with-cpp -P -dM -E -o $@ $<
 
+# If .u-boot.cfg.d is still present, then either:
+# a) The previous build used a Makefile that used if_changed rather than
+#    if_changed_dep when building u-boot.cfg, and hence any later builds will
+#    be unaware of the dependencies for u-boot.cfg. In this case, we must
+#    delete u-boot.cfg to force it and .u-boot.cfg.cmd to be rebuilt the
+#    correct way.
+# b) The previous build failed or was interrupted while building u-boot.cfg,
+#    so deleting u-boot.cfg isn't going to cause any additional work.
+ifneq ($(wildcard $(obj)/.$(SPL_BIN).d),)
+  unused := $(shell rm -f $(obj)/$(SPL_BIN).cfg)
+endif
 $(obj)/$(SPL_BIN).cfg: include/config.h FORCE
        $(call if_changed_dep,cpp_cfg)