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SubjectMoving zlib so that others may use it
I'm working on a function that uses zlib in the kernel, and I know of 
other places zlib is used (ppp_deflate, jffs2, mcore). I would expect
more users to come along.

I would like to propose putting zlib in the lib directory and making it
optionally compile if it is needed. It's pretty easy to move the files
around and make a few small changes to the code. However, how do I
configure such a thing? I could add something like:

if [ "$CONFIG_PPP_DEFLATE" = "y" ]; then
define_tristate CONFIG_ZLIB y
fi
if [ "$CONFIG_PPP_DEFLATE" = "m" ]; then
if [ "$CONFIG_ZLIB" != "y" ]; then
define_tristate CONFIG_ZLIB m
fi
fi

to every place that uses it, or I could put something like:

if [ "$CONFIG_JFFS2_FS" = "y" \
-o "$CONFIG_PPP_DEFLATE" = "y" ]; then
define_tristate CONFIG_ZLIB y
else
if [ "$CONFIG_JFFS2_FS" = "m" \
-o "$CONFIG_PPP_DEFLATE" = "m" ]; then
define_tristate CONFIG_ZLIB m
fi
fi

at the end of the config. I would prefer the latter, but there is not
an "end of config" place, you would have to put it at the end of every
config.in (about 15 architectures right now). I propose to add a
Config.in to the lib directory that is sourced at the end of every
config.in for the architectures. I'll do the work if it's willing to be
accepted into the kernel.

-Corey


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