initial buildroot for linux 5.15

package/ccache/ccache.hash

@@ -0,0 +1,4 @@
+# sha256 computed locally
+sha256  a02f4e8360dc6618bc494ca35b0ae21cea080f804a4898eab1ad3fcd108eb400  ccache-3.7.12.tar.xz
+sha256  ec6b1a326ff93b2cc21df88a697ae470ff6927a55b8929e7e491b315e1563361  GPL-3.0.txt
+sha256  4f63223bcdee822d55a6768cc8399ffe06401d7a03cfe79e1dc305f50dc22c59  LICENSE.adoc

package/ccache/ccache.mk

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+################################################################################
+#
+# ccache
+#
+################################################################################
+
+CCACHE_VERSION = 3.7.12
+CCACHE_SITE = https://github.com/ccache/ccache/releases/download/v$(CCACHE_VERSION)
+CCACHE_SOURCE = ccache-$(CCACHE_VERSION).tar.xz
+CCACHE_LICENSE = GPL-3.0+, others
+CCACHE_LICENSE_FILES = LICENSE.adoc GPL-3.0.txt
+
+# Force ccache to use its internal zlib. The problem is that without
+# this, ccache would link against the zlib of the build system, but we
+# might build and install a different version of zlib in $(O)/host
+# afterwards, which ccache will pick up. This might break if there is
+# a version mismatch. A solution would be to add host-zlib has a
+# dependency of ccache, but it would require tuning the zlib .mk file
+# to use HOSTCC_NOCCACHE as the compiler. Instead, we take the easy
+# path: tell ccache to use its internal copy of zlib, so that ccache
+# has zero dependency besides the C library.
+HOST_CCACHE_CONF_OPTS += --with-bundled-zlib
+
+# We are ccache, so we can't use ccache
+HOST_CCACHE_CONF_ENV = \
+	CC="$(HOSTCC_NOCCACHE)" \
+	CXX="$(HOSTCXX_NOCCACHE)"
+
+# Patch host-ccache as follows:
+#  - Use BR_CACHE_DIR instead of CCACHE_DIR, because CCACHE_DIR
+#    is already used by autotargets for the ccache package.
+#    BR_CACHE_DIR is exported by Makefile based on config option
+#    BR2_CCACHE_DIR.
+#  - Change hard-coded last-ditch default to match path in .config, to avoid
+#    the need to specify BR_CACHE_DIR when invoking ccache directly.
+#    CCache replaces "%s" with the home directory of the current user,
+#    So rewrite BR_CACHE_DIR to take that into consideration for SDK purpose
+HOST_CCACHE_DEFAULT_CCACHE_DIR = $(patsubst $(HOME)/%,\%s/%,$(BR_CACHE_DIR))
+
+define HOST_CCACHE_PATCH_CONFIGURATION
+	sed -i 's,getenv("CCACHE_DIR"),getenv("BR_CACHE_DIR"),' $(@D)/src/ccache.c
+	sed -i 's,"%s/.ccache","$(HOST_CCACHE_DEFAULT_CCACHE_DIR)",' $(@D)/src/conf.c
+endef
+
+HOST_CCACHE_POST_PATCH_HOOKS += HOST_CCACHE_PATCH_CONFIGURATION
+
+define HOST_CCACHE_MAKE_CACHE_DIR
+	mkdir -p $(BR_CACHE_DIR)
+endef
+
+HOST_CCACHE_POST_INSTALL_HOOKS += HOST_CCACHE_MAKE_CACHE_DIR
+
+# Provide capability to do initial ccache setup (e.g. increase default size)
+BR_CCACHE_INITIAL_SETUP = $(call qstrip,$(BR2_CCACHE_INITIAL_SETUP))
+ifneq ($(BR_CCACHE_INITIAL_SETUP),)
+define HOST_CCACHE_DO_INITIAL_SETUP
+	@$(call MESSAGE,"Applying initial settings")
+	$(CCACHE) $(BR_CCACHE_INITIAL_SETUP)
+	$(CCACHE) -s
+endef
+
+HOST_CCACHE_POST_INSTALL_HOOKS += HOST_CCACHE_DO_INITIAL_SETUP
+endif
+
+$(eval $(host-autotools-package))
+
+ifeq ($(BR2_CCACHE),y)
+ccache-stats: host-ccache
+	$(Q)$(CCACHE) -s
+
+ccache-options: host-ccache
+ifeq ($(CCACHE_OPTIONS),)
+	$(Q)echo "Usage: make ccache-options CCACHE_OPTIONS=\"opts\""
+	$(Q)echo "where 'opts' corresponds to one or more valid ccache options" \
+	"(see ccache help text below)"
+	$(Q)echo
+endif
+	$(Q)$(CCACHE) $(CCACHE_OPTIONS)
+endif