From 2ca084ccaae619ac8031e902c66817d021ac6fd5 Mon Sep 17 00:00:00 2001
From: Roman Yeryomin <roman@advem.lv>
Date: Fri, 12 Jun 2020 21:43:46 +0300
Subject: build: improve ccache support

Set CCACHE_DIR to $(TOPDIR)/.ccache and CCACHE_BASEDIR to $(TOPDIR).
This allows to do clean and dirclean. Cache hit rate for test build
after dirclean is ~65%.
If CCACHE is enabled stats are printed out at the end of building process.
CCACHE_DIR config variable allows to override default, which could be useful
when sharing cache with many builds.
cacheclean make target allows to clean the cache.

Changes from v1:
- remove ccache directory using CCACHE_DIR variable
- remove ccache leftovers from sdk and toolchain make files
- introduce CONFIG_CCACHE_DIR variable
- introduce cacheclean make target

Signed-off-by: Roman Yeryomin <roman@advem.lv>
---
 include/host-build.mk | 4 +++-
 include/package.mk    | 4 +++-
 include/toplevel.mk   | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

(limited to 'include')

diff --git a/include/host-build.mk b/include/host-build.mk
index 9fc14241c6..7d84ab0f5f 100644
--- a/include/host-build.mk
+++ b/include/host-build.mk
@@ -132,7 +132,9 @@ define Host/Exports/Default
   $(1) : export STAGING_PREFIX=$$(HOST_BUILD_PREFIX)
   $(1) : export PKG_CONFIG_PATH=$$(STAGING_DIR_HOST)/lib/pkgconfig:$$(HOST_BUILD_PREFIX)/lib/pkgconfig
   $(1) : export PKG_CONFIG_LIBDIR=$$(HOST_BUILD_PREFIX)/lib/pkgconfig
-  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_DIR:=$(STAGING_DIR_HOST)/ccache)
+  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_BASEDIR:=$(TOPDIR))
+  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_DIR:=$(if $(call qstrip,$(CONFIG_CCACHE_DIR)),$(call qstrip,$(CONFIG_CCACHE_DIR)),$(TOPDIR)/.ccache))
+  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_COMPILERCHECK:=%compiler% -dumpmachine; %compiler% -dumpversion)
   $(if $(HOST_CONFIG_SITE),$(1) : export CONFIG_SITE:=$(HOST_CONFIG_SITE))
   $(if $(IS_PACKAGE_BUILD),$(1) : export PATH=$$(TARGET_PATH_PKG))
 endef
diff --git a/include/package.mk b/include/package.mk
index 0575692742..a93d6b78f3 100644
--- a/include/package.mk
+++ b/include/package.mk
@@ -173,7 +173,9 @@ define Build/Exports/Default
   $(1) : export CONFIG_SITE:=$$(CONFIG_SITE)
   $(1) : export PKG_CONFIG_PATH:=$$(PKG_CONFIG_PATH)
   $(1) : export PKG_CONFIG_LIBDIR:=$$(PKG_CONFIG_PATH)
-  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_DIR:=$(STAGING_DIR)/ccache)
+  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_BASEDIR:=$(TOPDIR))
+  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_DIR:=$(if $(call qstrip,$(CONFIG_CCACHE_DIR)),$(call qstrip,$(CONFIG_CCACHE_DIR)),$(TOPDIR)/.ccache))
+  $(if $(CONFIG_CCACHE),$(1) : export CCACHE_COMPILERCHECK:=%compiler% -dumpmachine; %compiler% -dumpversion)
 endef
 Build/Exports=$(Build/Exports/Default)
 
diff --git a/include/toplevel.mk b/include/toplevel.mk
index 8564a4de73..0a64afe153 100644
--- a/include/toplevel.mk
+++ b/include/toplevel.mk
@@ -262,7 +262,7 @@ package/symlinks-clean:
 help:
 	cat README
 
-distclean:
+distclean: cacheclean
 	rm -rf bin build_dir .config* dl feeds key-build* logs package/feeds package/openwrt-packages staging_dir tmp
 	@$(_SINGLE)$(SUBMAKE) -C scripts/config clean
 
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