[Buildroot] [RESEND PATCH v2 1/2] package/pkg-kconfig.mk new <pkg>-show-fragment target

[Marcus Folkesson <marcus.folkesson@gmail.com>]

This patch introduce the new target to simplify the generation of
configuration fragments as the output could be directly copied into a
fragment file as-is.

It is *heavily* based on the <pkg>-diff-config target, but serves a
different purpose.

Output from linux-diff-config:
-CONFIG_GCC_PLUGIN_ARM_SSP_PER_TASK y
-CONFIG_GCC_PLUGIN_CYC_COMPLEXITY n
-CONFIG_GCC_PLUGIN_LATENT_ENTROPY n
-CONFIG_GCC_PLUGIN_RANDSTRUCT n
-CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF n
-CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL n
-CONFIG_GCC_PLUGIN_STRUCTLEAK_USER n
-CONFIG_STACKPROTECTOR_PER_TASK y
CONFIG_CRYPTO_DH n -> y
CONFIG_CRYPTO_KPP m -> y
CONFIG_GCC_PLUGINS y -> n
CONFIG_KEY_DH_OPERATIONS n -> y
CONFIG_PKCS8_PRIVATE_KEY_PARSER n -> y
CONFIG_VIDEO_IMX274 n -> m

Output from linux-show-fragment:
CONFIG_CRYPTO_DH=y
CONFIG_CRYPTO_KPP=y
CONFIG_KEY_DH_OPERATIONS=y
CONFIG_PKCS8_PRIVATE_KEY_PARSER=y
CONFIG_VIDEO_IMX274=m

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
---
 package/pkg-kconfig.mk | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/package/pkg-kconfig.mk b/package/pkg-kconfig.mk
index f4f35bf96a..ee96525c47 100644
--- a/package/pkg-kconfig.mk
+++ b/package/pkg-kconfig.mk
@@ -309,12 +309,26 @@ $(1)-diff-config: $(1)-check-configuration-done
 	$$(Q)cp -a $$($(2)_DIR)/.config.dc.bak $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG)
 	$$(Q)rm -f $$($(2)_DIR)/.config.dc.bak
 
+# Target to output differences between the configuration obtained via the
+# defconfig + fragments (if any) and the current configuration.
+# Output format is suitable to be used as-is in fragment files.
+# Note: it preserves the timestamp of the current configuration when moving it
+# around.
+$(1)-show-fragment: $(1)-check-configuration-done
+	$$(Q)cp -a $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG) $$($(2)_DIR)/.config.dc.bak
+	$$(call kconfig-package-merge-config,$(2),$$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG),\
+		$$($(2)_KCONFIG_FRAGMENT_FILES))
+	$$(Q)utils/diffconfig -m $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG) \
+		 $$($(2)_DIR)/.config.dc.bak
+	$$(Q)cp -a $$($(2)_DIR)/.config.dc.bak $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG)
+	$$(Q)rm -f $$($(2)_DIR)/.config.dc.bak
 
 endif # package enabled
 
 .PHONY: \
 	$(1)-diff-config \
 	$(1)-check-configuration-done \
+	$(1)-show-fragment \
 	$$($(2)_DIR)/.kconfig_editor_% \
 	$$(addprefix $(1)-,$$($(2)_KCONFIG_EDITORS))
 
-- 
2.39.2

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