kbuild: generate u-boot.cfg as a byproduct of include/autoconf.mk
Our build system still parses ad-hoc CONFIG options in header files
and generates include/autoconf.mk so that Makefiles can reference
them. This gimmick was introduced in the pre-Kconfig days and will
be kept until Kconfig migration is completed.
The include/autoconf.mk is generated like follows:
[1] Preprocess include/common.h with -DDO_DEPS_ONLY and
retrieve macros into include/autoconf.mk.tmp
[2] Reformat include/autoconf.mk.dep into include/autoconf.mk
with tools/scripts/define2mk.sed script
[3] Remove include/autoconf.mk.tmp
Here, include/autoconf.mk.tmp is similar to u-boot.cfg, which is
also generated by preprocessing include/config.h with -DDO_DEPS_ONLY.
In other words, there is much overlap among include/autoconf.mk and
u-boot.cfg build rules.
So, the idea is to split the build rule of include/autoconf.mk
into two stages. The first preprocesses headers into u-boot.cfg.
The second parses the u-boot.cfg into include/autoconf.mk. The
build rules of u-boot.cfg in Makefile and spl/Makefile will be gone.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/scripts/Makefile.autoconf b/scripts/Makefile.autoconf
index ba674f8..2f85eb9 100644
--- a/scripts/Makefile.autoconf
+++ b/scripts/Makefile.autoconf
@@ -58,29 +58,44 @@
# same CONFIG macros
quiet_cmd_autoconf = GEN $@
cmd_autoconf = \
- $(CPP) $(c_flags) $2 -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && { \
- sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp | \
+ sed -n -f $(srctree)/tools/scripts/define2mk.sed $< | \
while read line; do \
if [ -n "${KCONFIG_IGNORE_DUPLICATES}" ] || \
! grep -q "$${line%=*}=" include/config/auto.conf; then \
echo "$$line"; \
fi \
- done > $@; \
- rm $@.tmp; \
- } || { \
- rm $@.tmp; false; \
+ done > $@
+
+quiet_cmd_u_boot_cfg = CFG $@
+ cmd_u_boot_cfg = \
+ $(CPP) $(c_flags) $2 -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && { \
+ grep 'define CONFIG_' $@.tmp > $@; \
+ rm $@.tmp; \
+ } || { \
+ rm $@.tmp; false; \
}
+u-boot.cfg: include/config.h FORCE
+ $(call cmd,u_boot_cfg)
+
+spl/u-boot.cfg: include/config.h FORCE
+ $(Q)mkdir -p $(dir $@)
+ $(call cmd,u_boot_cfg,-DCONFIG_SPL_BUILD)
+
+tpl/u-boot.cfg: include/config.h FORCE
+ $(Q)mkdir -p $(dir $@)
+ $(call cmd,u_boot_cfg,-DCONFIG_SPL_BUILD -DCONFIG_TPL_BUILD)
+
-include/autoconf.mk: include/config.h FORCE
+include/autoconf.mk: u-boot.cfg
$(call cmd,autoconf)
-spl/include/autoconf.mk: include/config.h FORCE
+spl/include/autoconf.mk: spl/u-boot.cfg
$(Q)mkdir -p $(dir $@)
- $(call cmd,autoconf,-DCONFIG_SPL_BUILD)
+ $(call cmd,autoconf)
-tpl/include/autoconf.mk: include/config.h FORCE
+tpl/include/autoconf.mk: tpl/u-boot.cfg
$(Q)mkdir -p $(dir $@)
- $(call cmd,autoconf,-DCONFIG_SPL_BUILD -DCONFIG_TPL_BUILD)
+ $(call cmd,autoconf)
# include/config.h
# Prior to Kconfig, it was generated by mkconfig. Now it is created here.