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tools/cmake: always use non-ccache CC and CXX variables 

cmake is a dependency of ccache, which means it is build before ccache
is available and hence must be build with non-ccache CC and CXX. It
currently works, because the cmake build system splits the compiler
variable and treats them as multiple compilers to check.

For "ccache gcc" it first tests for "ccache", which always fails,
because ccache is not a compiler by itself, even if it is available, and
then ends up calling "gcc" alone, effectively never using ccache.

Let's make this explicit by forcing the use of non-ccache CC and CXX.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
This commit is contained in:
Sven Wegener 2021-01-01 12:27:33 +01:00 committed by Paul Spooren
parent 980dca6b7f
commit 936220186d
1 changed files with 2 additions and 14 deletions
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16
tools/cmake/Makefile
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@ -21,21 +21,9 @@ HOST_CONFIGURE_PARALLEL:=1
include $(INCLUDE_DIR)/host-build.mk
# Workaround for GCC versions below 6.X and ccache
# Reference: https://github.com/openwrt/openwrt/pull/1929
GCC_DMPVER_GREPCMD := grep -E '^(4\.[8-9]|[5]\.?)'
GCC_DMPVER_STRING := $(shell $(HOSTCC_NOCACHE) -dumpversion | $(GCC_DMPVER_GREPCMD))
ifneq ($(GCC_DMPVER_STRING),)
ifeq ($(CONFIG_CCACHE),y)
$(info GCC version less than 6.0 detected, disabling CCACHE)
HOST_CONFIGURE_VARS:=$(filter-out CC=% gcc%",$(HOST_CONFIGURE_VARS)) CC="$(HOSTCC_NOCACHE)"
HOST_CONFIGURE_VARS:=$(filter-out CXX=% g++%",$(HOST_CONFIGURE_VARS)) CXX="$(HOSTCXX_NOCACHE)"
else
$(info GCC version greater or equal to 6.0 detected, no workaround set for CCACHE)
endif
endif
HOST_CONFIGURE_VARS += \
CC="$(HOSTCC_NOCACHE)" \
CXX="$(HOSTCXX_NOCACHE)" \
MAKEFLAGS="$(HOST_JOBS)" \
CXXFLAGS="$(HOST_CFLAGS)"