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-rw-r--r--Makefile18
1 files changed, 17 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index dbd7d4fb3a..f1f3e4bdd3 100644
--- a/Makefile
+++ b/Makefile
@@ -362,6 +362,21 @@ $(obj)System.map: $(obj)u-boot
grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
sort > $(obj)System.map
+#
+# Auto-generate the autoconf.mk file (which is included by all makefiles)
+#
+# This target actually generates 2 files; autoconf.mk and autoconf.mk.dep.
+# the dep file is only include in this top level makefile to determine when
+# to regenerate the autoconf.mk file.
+$(OBJTREE)/include/autoconf.mk: $(obj)include/config.h
+ @echo Generating include/autoconf.mk
+ @# Generate the dependancies
+ @$(CC) -M $(HOST_CFLAGS) $(CPPFLAGS) -MQ $@ include/common.h > $@.dep
+ @# Extract the config macros
+ @$(CPP) $(CFLAGS) -dM include/common.h | sed -n -f tools/scripts/define2mk.sed >> $@
+
+sinclude $(OBJTREE)/include/autoconf.mk.dep
+
#########################################################################
else
all $(obj)u-boot.hex $(obj)u-boot.srec $(obj)u-boot.bin \
@@ -381,7 +396,8 @@ CHANGELOG:
unconfig:
@rm -f $(obj)include/config.h $(obj)include/config.mk \
- $(obj)board/*/config.tmp $(obj)board/*/*/config.tmp
+ $(obj)board/*/config.tmp $(obj)board/*/*/config.tmp \
+ $(obj)include/autoconf.mk $(obj)include/autoconf.mk.dep
#========================================================================
# PowerPC