path: root/meta/classes/ccache.bbclass
diff options
authorRobert Yang <>2018-12-07 02:55:29 (GMT)
committerRichard Purdie <>2019-01-14 11:35:55 (GMT)
commit0c98ff2c31d462ea139ebf1a3e0dbd97088d5466 (patch)
tree34f52ca5fdc645585ee8f4a5ded9dc0273a00271 /meta/classes/ccache.bbclass
parent87413eb34a810f3c267f1185a4f2af211838530f (diff)
ccache.bbclass: Refactor it to make it more reliable
The previous ccache.bbclass has the following problems: - It uses host's ccache for native recipes, but this may not work on some hosts, for example, it nerver works on my Ubuntu 14.04.4, there are always build failures (m4-native failed at do_configure, and others will also be failed if I disable CCACHE for m4-native) - native/nativesdk/cross/crosssdk recipes use host's ccache, but target uses ccache-native, this may confuse user. - The target recipes may use both host's ccache and ccache-native, this may cause unexpected problems and be hard to debug. This is because ccache-native is in SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS, so ccache-native may not be present when rebuild target recipes, and then it would use hosttools/ccache, but the previous ccache files were generated by ccache-native. - Target recipes can't use ccache when no ccache is installed on the host: CCACHE = "${@bb.utils.which(d.getVar('PATH'), 'ccache') and 'ccache '}" After refactored: All types recipes (native, target and others) will use ccache-native except ccache-native itself, host's cache won't be used any more. It is more reliable now, which will work everywhere when ccache-native can be built. And now we need use "CCACHE_DISABLE = '1'" to disable ccache for the recipe rather than "CCACHE = ''" since we set CCACHE in anonymous function, and d.getVar('CCACHE') works after "CCACHE ??=" which is set in bitbake.conf, so we can't check whether CCACHE is set or not in anonymous function since it is always set. Use CCACHE_DISABLE to disable it would be more clear. (From OE-Core rev: b25271b65262f70d849a4861da216c9be6c54d53) Signed-off-by: Robert Yang <> Signed-off-by: Richard Purdie <>
Diffstat (limited to 'meta/classes/ccache.bbclass')
1 files changed, 22 insertions, 3 deletions
diff --git a/meta/classes/ccache.bbclass b/meta/classes/ccache.bbclass
index 9609020..59e1022 100644
--- a/meta/classes/ccache.bbclass
+++ b/meta/classes/ccache.bbclass
@@ -1,4 +1,14 @@
1CCACHE = "${@bb.utils.which(d.getVar('PATH'), 'ccache') and 'ccache '}" 1#
2# Usage:
3# - Enable ccache
4# Add the following line to a conffile such as conf/local.conf:
5# INHERIT += "ccache"
7# - Disable ccache for a recipe
8# Add the following line to the recipe if it can't be built with ccache:
2export CCACHE_DIR ?= "${TMPDIR}/ccache/${MULTIMACH_TARGET_SYS}/${PN}" 12export CCACHE_DIR ?= "${TMPDIR}/ccache/${MULTIMACH_TARGET_SYS}/${PN}"
3 13
4# We need to stop ccache considering the current directory or the 14# We need to stop ccache considering the current directory or the
@@ -7,5 +17,14 @@ export CCACHE_DIR ?= "${TMPDIR}/ccache/${MULTIMACH_TARGET_SYS}/${PN}"
7# ${PV} or ${PR} change. 17# ${PV} or ${PR} change.
8export CCACHE_NOHASHDIR ?= "1" 18export CCACHE_NOHASHDIR ?= "1"
9 19
10DEPENDS_append_class-target = " ccache-native" 20python() {
11DEPENDS[vardepvalueexclude] = " ccache-native" 21 """
22 Enable ccache for the recipe
23 """
24 pn = d.getVar('PN')
25 # quilt-native doesn't need ccache since no c files
26 if not (pn in ('ccache-native', 'quilt-native') or
27 bb.utils.to_boolean(d.getVar('CCACHE_DISABLE'))):
28 d.appendVar('DEPENDS', ' ccache-native')
29 d.setVar('CCACHE', 'ccache ')