[Buildroot] [PATCH 2/3] boot/uboot: use HOSTCC_NOCCACHE as kconfig HOSTCC

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

At kconfig time, dependencies are not built, and therefore host-ccache
is not ready. Due to this, using $(HOSTCC) as the host compiler in
KCONFIG_OPTS does not work: a "make uboot-menuconfig" invocation from
a clean tree with ccache enabled fails.

This commit fixes this by using $(HOSTCC_NOCCACHE). We cannot rely on
the default value of HOSTCC passed by the kconfig-package
infrastructure, because $(UBOOT_MAKE_OPTS) also contains a HOSTCC
definition that would override the one passed by the kconfig-package
infrastructure.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 boot/uboot/uboot.mk | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/boot/uboot/uboot.mk b/boot/uboot/uboot.mk
index cbdfee6ac3..6977bcc064 100644
--- a/boot/uboot/uboot.mk
+++ b/boot/uboot/uboot.mk
@@ -227,8 +227,9 @@ UBOOT_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 # (which is typically wchar) but link with
 # $(HOST_DIR)/lib/libncurses.so (which is not).  We don't actually
 # need any host-package for kconfig, so remove the HOSTCC/HOSTLDFLAGS
-# override again.
-UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS) HOSTCC="$(HOSTCC)" HOSTLDFLAGS=""
+# override again. In addition, host-ccache is not ready at kconfig
+# time, so use HOSTCC_NOCCACHE.
+UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS) HOSTCC="$(HOSTCC_NOCCACHE)" HOSTLDFLAGS=""
 define UBOOT_HELP_CMDS
 	@echo '  uboot-menuconfig       - Run U-Boot menuconfig'
 	@echo '  uboot-savedefconfig    - Run U-Boot savedefconfig'
-- 
2.20.1