[U-Boot] [PATCH v3 34/36] Kbuild: support simultaneous board configuration and "make all"

[Masahiro Yamada]

This commit fixes two problems:

[1] We could not do board configuration and "make all"
    in one command line.

For example, the following did not work as we expect:
  $ make sandbox_config all
  Configuring for sandbox board...
  make: Nothing to be done for `all'.

[2] mixed-target build did not work with -j option

For example, the following did not work:
  $ make -j8 sandbox_config u-boot
  Makefile:481: *** "System not configured - see README".  Stop.
  make: *** [u-boot] Error 2
  make: *** Waiting for unfinished jobs....
  Configuring for sandbox board...

Going forward, we can do
  $ make -j8 sandbox_config all

This is the same as
  $ make sandbox_config
  $ make -j8

Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
---

Changes in v3: None
Changes in v2: None

 Makefile | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 00424d5..f62944c 100644
--- a/Makefile
+++ b/Makefile
@@ -429,8 +429,16 @@ ifeq ($(mixed-targets),1)
 # We're called with mixed targets (*config and build targets).
 # Handle them one by one.
 
-%:: FORCE
-	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
+PHONY += $(MAKECMDGOALS) build-one-by-one
+
+$(MAKECMDGOALS): build-one-by-one
+	@:
+
+build-one-by-one:
+	$(Q)set -e; \
+	for i in $(MAKECMDGOALS); do \
+		$(MAKE) -f $(srctree)/Makefile $$i; \
+	done
 
 else
 ifeq ($(config-targets),1)
-- 
1.8.3.2