A common requirement when converting CONFIG options to Kconfig is to check
that the effective configuration has not changed due to the conversion. Add
a target which creates this configuration (in the form of u-boot.cfg) but
does not build U-Boot. This speeds up the checking.

Signed-off-by: Simon Glass <s...@chromium.org>
---

 Makefile             | 9 +++++++++
 scripts/Makefile.spl | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/Makefile b/Makefile
index fffc188..f835780 100644
--- a/Makefile
+++ b/Makefile
@@ -812,6 +812,14 @@ append = cat $(filter-out $< $(PHONY), $^) >> $@
 quiet_cmd_pad_cat = CAT     $@
 cmd_pad_cat = $(cmd_objcopy) && $(append) || rm -f $@
 
+cfg: u-boot.cfg $(if $(CONFIG_SPL),cfg-spl) $(if $(CONFIG_TPL),cfg-tpl)
+
+cfg-spl:
+       $(Q)$(MAKE) obj=spl -f $(srctree)/scripts/Makefile.spl cfg
+
+cfg-tpl:
+       $(Q)$(MAKE) obj=tpl -f $(srctree)/scripts/Makefile.spl cfg
+
 all:           $(ALL-y)
 ifeq ($(CONFIG_DM_I2C_COMPAT)$(CONFIG_SANDBOX),y)
        @echo "===================== WARNING ======================"
@@ -1517,6 +1525,7 @@ help:
        @echo  '  cscope          - Generate cscope index'
        @echo  '  ubootrelease    - Output the release version string (use with 
make -s)'
        @echo  '  ubootversion    - Output the version stored in Makefile (use 
with make -s)'
+       @echo  "  cfg             - Don't build, just create the .cfg files"
        @echo  ''
        @echo  'Static analysers'
        @echo  '  checkstack      - Generate a list of stack hogs'
diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index 4994fa8..21bdcf2 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -219,6 +219,8 @@ cmd_cpp_cfg = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) 
$(LDPPFLAGS) -ansi \
 $(obj)/$(SPL_BIN).cfg: include/config.h FORCE
        $(call if_changed,cpp_cfg)
 
+cfg: $(obj)/$(SPL_BIN).cfg
+
 pythonpath = PYTHONPATH=tools
 
 quiet_cmd_dtocc = DTOC C  $@
-- 
2.8.0.rc3.226.g39d4020

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