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Cygwin + zlib


Currently, to build natively on cygwin, this patch is required to zlib:

https://github.com/Alexpux/MSYS2-packages/blob/master/zlib/1.2.11-cygwin-no-widechar.patch

Otherwise, this error occurs:

./../zlib/libz.a(libz_a-gzlib.o):gzlib.c:(.text+0x646): undefined
reference to `_wopen'
./../zlib/libz.a(libz_a-gzlib.o):gzlib.c:(.text+0x646): relocation
truncated to fit: R_X86_64_PC32 against undefined symbol `_wopen'


Given that cygwin is a supported system, and given that zlib is
in-tree (and was recently updated), does it make sense to include this
patch in the gcc in-tree version of zlib?


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