[OE-core] [PATCH 1/2] ccache: enable max size setup for ccache dir

[Yannick Gicquel]

ccache directories are limited to 1G by default.
This patch enables the configuration of their limits, and as default
location is TMPDIR, it proposes a size limit to "0" (unlimited).

The setup can be overloaded in local.conf by setting
CCACHE_MAX_SIZE to a custom value if needed.

Signed-off-by: Yannick Gicquel <yannick.gicquel at iot.bzh>
---
 meta/classes/ccache.bbclass | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/meta/classes/ccache.bbclass b/meta/classes/ccache.bbclass
index 93fcaca..8a80040 100644
--- a/meta/classes/ccache.bbclass
+++ b/meta/classes/ccache.bbclass
@@ -1,6 +1,21 @@
 CCACHE = "${@bb.utils.which(d.getVar('PATH'), 'ccache') and 'ccache '}"
 export CCACHE_DIR ?= "${TMPDIR}/ccache/${MULTIMACH_HOST_SYS}/${PN}"
 CCACHE_DISABLE[unexport] = "1"
+CCACHE_MAX_SIZE ?= "0"
 
 do_configure[dirs] =+ "${CCACHE_DIR}"
 do_kernel_configme[dirs] =+ "${CCACHE_DIR}"
+
+def init_ccache():
+    # dummy python version
+    return
+
+init_ccache() {
+    if [ -n "${CCACHE}" ]; then
+        ${CCACHE} -M ${CCACHE_MAX_SIZE}
+    fi
+}
+
+do_compile_prepend() {
+    init_ccache
+}
-- 
1.9.1