[U-Boot] [PATCH v2 1/4] Makefile: Add a target to create the .cfg files

[Simon Glass]

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 <sjg at chromium.org>
---

Changes in v2:
- Rebase to mainline with Masahiro's changes

 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index 37cbcb2..6729c1b 100644
--- a/Makefile
+++ b/Makefile
@@ -812,6 +812,8 @@ append = cat $(filter-out $< $(PHONY), $^) >> $@
 quiet_cmd_pad_cat = CAT     $@
 cmd_pad_cat = $(cmd_objcopy) && $(append) || rm -f $@
 
+cfg: u-boot.cfg
+
 all:		$(ALL-y)
 ifeq ($(CONFIG_DM_I2C_COMPAT)$(CONFIG_SANDBOX),y)
 	@echo "===================== WARNING ======================"
@@ -1518,6 +1520,7 @@ 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'
-- 
2.8.0.rc3.226.g39d4020