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ccache.bbclass: Set CCACHE_CONFIGPATH to fix race issues

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Fixed race issues when parallel build:
ccache: error: /path/to/ccache/i586-poky-linux/mmc-utils/ccache.conf: No such file or directory
ccache: error: /path/to/ccache/i586-poky-linux/mmc-utils/ccache.conf: No such file or directory

This is because we set CCACHE_DIR for earch recipe, and ccache will create a
ccache.conf for each CCACHE_DIR when CCACHE_CONFIGPATH is not set, but there
might be a race issue in parallel build:

ccache gcc file1.c
ccache gcc file2.c

If the two ccache processes use fopen(path, "w") to create ccache.conf at the
same time, the error would happen. Set CCACHE_CONFIGPATH to
meta/conf/ccache.conf can fix the problem, and we can add other configs to the
file when needed.

And also set cache_dir_levels to 1 (default is 2) since each recipe has a cache
dir, thus we don't have too many files in one dir.

(From OE-Core rev: 2abbc4d0cd571e82ed6188d3b2d84b4cd6be25e8)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Robert Yang
2018-12-17 14:30:27 +08:00
committed by Richard Purdie
parent 7953d6a8bc
commit e96d0200ca
2 changed files with 4 additions and 0 deletions
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2
meta/classes/ccache.bbclass
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@@ -29,6 +29,8 @@ export CCACHE_BASEDIR ?= "${TMPDIR}"
# Used for sharing cache files after compiler is rebuilt
export CCACHE_COMPILERCHECK ?= "%compiler% -dumpspecs"
export CCACHE_CONFIGPATH ?= "${COREBASE}/meta/conf/ccache.conf"
export CCACHE_DIR ?= "${CCACHE_TOP_DIR}/${MULTIMACH_TARGET_SYS}/${PN}"
# We need to stop ccache considering the current directory or the

2
meta/conf/ccache.conf Normal file
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@@ -0,0 +1,2 @@
max_size = 0
cache_dir_levels = 1