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e96d0200ca
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>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.