tree aed93070f7e1be31868dce1d62a1de6ffc1360f9
parent fb4e0599a5ddaef9eee726f786b9edef4943432b
author Mark Adler <madler@alumni.caltech.edu> 1344820132 -0700
committer Mark Adler <madler@alumni.caltech.edu> 1344841360 -0700

Clean up the usage of z_const and respect const usage within zlib.

This patch allows zlib to compile cleanly with the -Wcast-qual gcc
warning enabled, but only if ZLIB_CONST is defined, which adds
const to next_in and msg in z_stream and in the in_func prototype.
A --const option is added to ./configure which adds -DZLIB_CONST
to the compile flags, and adds -Wcast-qual to the compile flags
when ZLIBGCCWARN is set in the environment.