[Buildroot] [v3 09/13] pkg-generic: introduce _SAME_SOURCE_AS

Maxime Hadjinlian maxime.hadjinlian at gmail.com
Sat Mar 31 14:24:03 UTC 2018

This per package variable can be used to specify that a package shares
the same sources as another package.

The use case here is for example linux-headers and linux, which share
the same sources (because they are the same upstream project), so we
don't want to download twice the kernel, nor store it multiple times

Make will automatically try to help by introducing leading and trailing
spaces when replacing a line-continuation '\', so we need to call
$(strip) on the variable.

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian at gmail.com>
 package/pkg-generic.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
index b1342228c8..f3829e9912 100644
--- a/package/pkg-generic.mk
+++ b/package/pkg-generic.mk
@@ -428,7 +428,9 @@ endif
 $(2)_BASE_NAME	= $$(if $$($(2)_VERSION),$(1)-$$($(2)_VERSION),$(1))
 $(2)_RAW_BASE_NAME = $$(if $$($(2)_VERSION),$$($(2)_RAWNAME)-$$($(2)_VERSION),$$($(2)_RAWNAME))
-$(2)_DL_DIR 	=  $$(DL_DIR)/$$($(2)_RAWNAME)
+$(2)_DL_DIR	= $$(strip $$(if $$($(2)_SAME_SOURCE_AS), \
+        $$($$(call UPPERCASE,$$($(2)_SAME_SOURCE_AS))_DL_DIR), \
+        $$(DL_DIR)/$$($(2)_RAWNAME)))
 $(2)_DIR	=  $$(BUILD_DIR)/$$($(2)_BASE_NAME)
 ifndef $(2)_SUBDIR

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