[source] sdk: explicitely remove ccache directories when packing SDK

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/f6de4a5025c758e05e53eb12f477a6dd27e4c42e

commit f6de4a5025c758e05e53eb12f477a6dd27e4c42e
Author: Jo-Philipp Wich <jo at mein.io>
AuthorDate: Tue Jan 24 15:29:20 2017 +0100

    sdk: explicitely remove ccache directories when packing SDK
    
    Upon first invocation, the ccache program will create the required directory
    hierarchy so there is no point in shipping these empty directories.
    
    Removing those paths also avoids shipping dangling symlinks in case the
    directories got linked elsewhere, e.g. into a shared global cache.
    
    Signed-off-by: Jo-Philipp Wich <jo at mein.io>
---
 target/sdk/Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/sdk/Makefile b/target/sdk/Makefile
index 47a7382..5108cec 100644
--- a/target/sdk/Makefile
+++ b/target/sdk/Makefile
@@ -17,6 +17,7 @@ SDK_NAME:=$(VERSION_DIST_SANITIZED)-sdk-$(if $(CONFIG_VERSION_FILENAMES),$(VERSI
 SDK_BUILD_DIR:=$(BUILD_DIR)/$(SDK_NAME)
 
 STAGING_SUBDIR_HOST := staging_dir/host
+STAGING_SUBDIR_TARGET := staging_dir/$(TARGET_DIR_NAME)
 STAGING_SUBDIR_TOOLCHAIN := staging_dir/toolchain-$(ARCH)$(ARCH_SUFFIX)_gcc-$(GCCV)_$(LIBC)-$(LIBCV)$(if $(CONFIG_arm),_eabi)
 
 EXCLUDE_DIRS:=*/ccache/* \
@@ -118,6 +119,11 @@ $(BIN_DIR)/$(SDK_NAME).tar.xz: clean
 		$(TOPDIR)/package/kernel/linux \
 		$(SDK_BUILD_DIR)/package/
 
+	-rm -rf \
+		$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_HOST)/ccache \
+		$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_TARGET)/ccache \
+		$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_TOOLCHAIN)/ccache
+
 	-rm -f $(SDK_BUILD_DIR)/feeds.conf.default
 	$(if $(BASE_FEED),echo "$(BASE_FEED)" > $(SDK_BUILD_DIR)/feeds.conf.default)
 	if [ -f $(TOPDIR)/feeds.conf ]; then \