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authorKang-Che Sung <explorer09@gmail.com>2017-01-08 14:31:06 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2017-01-08 14:31:06 +0100
commitd5e7ff02921854e28a9859d443f96900e041ca03 (patch)
tree74c979231242b91b25d3c4557f2db089f5c5901b /docs
parenta474728e82510aa98995f02ac53ca7207b0baf76 (diff)
downloadbusybox-d5e7ff02921854e28a9859d443f96900e041ca03.tar.gz
bunzip2: fix code bloat caused by zcat's seamless magic
This example single-applet configuration would trigger the bloat: CONFIG_FEATURE_SEAMLESS_XZ=y CONFIG_FEATURE_SEAMLESS_LZMA=y CONFIG_FEATURE_SEAMLESS_BZ2=y CONFIG_FEATURE_SEAMLESS_GZ=y CONFIG_BUNZIP2=y # CONFIG_ZCAT is not set # All other applets disabled Here, the resulting "busybox-bunzip2" binary would contain unpack_gz_stream, unpack_lzma_stream and unpack_xz_stream functions code. In other words, the gzip, lzma and xz decompressors' code are linked into the binary unnecessarily. This happens because SEAMLESS_MAGIC != 0 and compiler is unable to figure out that SEAMLESS_MAGIC bit is never set. Fix this by disabling SEAMLESS_MAGIC option flag (setting its value to 0) when zcat is disabled. This will help the compiler optimize out bbunpack() and no longer generate open_zipped() function call. Signed-off-by: Kang-Che Sung <explorer09@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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