From 627b7c9829de9a22bace0ab20a16409d761a9661 Mon Sep 17 00:00:00 2001
From: Matthias Reichl <hias@horus.com>
Date: Thu, 1 Dec 2022 15:13:57 +0100
Subject: [PATCH] config/functions: support using local ccache for early builds

If LOCAL_CCACHE is set to the full path of ccache on the build host
it will be used for early stage host package builds, eg make and ccache
at the moment.

By default it uses a separate cache dir (.ccache-local) so that it
doesn't interfere with our ccache (which is typically a different
version). The location can be changed by setting LOCAL_CCACHE_DIR

Signed-off-by: Matthias Reichl <hias@horus.com>
---
 config/functions | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/config/functions b/config/functions
index cc287404eb..a03dbb490b 100644
--- a/config/functions
+++ b/config/functions
@@ -495,6 +495,11 @@ setup_toolchain() {
       if [ "$1" = "host" ] && flag_enabled "local-cc" "no"; then
         export CC="${LOCAL_CC}"
         export CXX="${LOCAL_CXX}"
+        if [ -n "${LOCAL_CCACHE}" ]; then
+          export CCACHE_DIR="${LOCAL_CCACHE_DIR}"
+          export CC="${LOCAL_CCACHE} ${CC}";
+          export CXX="${LOCAL_CCACHE} ${CXX}";
+        fi
       else
         export CC="$TOOLCHAIN/bin/host-gcc"
         export CXX="$TOOLCHAIN/bin/host-g++"