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#############################################################
#
# ccache
#
#############################################################
CCACHE_VERSION = 3.1.7
CCACHE_SITE = http://samba.org/ftp/ccache
CCACHE_SOURCE = ccache-$(CCACHE_VERSION).tar.bz2
# When ccache is being built for the host, ccache is not yet
# available, so we have to use the special C compiler without the
# cache.
HOST_CCACHE_CONF_ENV = \
CC="$(HOSTCC_NOCCACHE)"
# 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_OPT += ccache_cv_zlib_1_2_3=no
# Patch host-ccache as follows:
# - Use BUILDROOT_CACHE_DIR instead of CCACHE_DIR, because CCACHE_DIR
# is already used by autotargets for the ccache package.
# BUILDROOT_CACHE_DIR is exported by Makefile based on config option
# BR2_CCACHE_DIR.
# - ccache shouldn't use the compiler binary mtime to detect a change in
# the compiler, because in the context of Buildroot, that completely
# defeats the purpose of ccache. Of course, that leaves the user
# responsible for purging its cache when the compiler changes.
define HOST_CCACHE_PATCH_CONFIGURATION
sed -i 's,getenv("CCACHE_DIR"),getenv("BUILDROOT_CACHE_DIR"),' $(@D)/ccache.c
sed -i 's,getenv("CCACHE_COMPILERCHECK"),"none",' $(@D)/ccache.c
endef
HOST_CCACHE_POST_CONFIGURE_HOOKS += \
HOST_CCACHE_PATCH_CONFIGURATION
$(eval $(call AUTOTARGETS))
$(eval $(host-autotools-package))
ifeq ($(BR2_CCACHE),y)
ccache-stats: host-ccache
$(Q)$(CCACHE) -s
endif
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