Bug appears to be related to software build and linked against different
version of libz:
Analysis:
Output of ld when trying to build an application that uses libpng16:
/usr/lib/x86_64-linux-gnu/libpng16.so.16: undefined reference to
`inflateReset2@ZLIB_1.2.3.4'
/usr/lib/x86_64-linux-gnu/libpng16.so.16: undefined reference to
`inflateValidate@ZLIB_1.2.9'
Output of ldd (same output as above):
> ldd /usr/lib/x86_64-linux-gnu/libpng16.so.16
linux-vdso.so.1 (0x00007ffeda752000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f0dd35dd000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f0dd323f000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0dd2e4e000)
/lib64/ld-linux-x86-64.so.2 (0x00007f0dd3a2c000)
checking for missing symbols:
> readelf --syms /usr/lib/x86_64-linux-gnu/libpng16.so.16 | grep inflateReset2
9: 0000000000000000 0 FUNC GLOBAL DEFAULT UND
inflateReset2@ZLIB_1.2.3.4 (4)
Ok, symbol appears to be there. Why does ld pop up the error?
--> linker command line references an older z-lib earlier on in the
library dependencies -> hence, zlib from system is not used (though
required by libpng16).
Solution: remove linker dependency to custom libz (remove "-lz") and try
linking against system libz.
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https://bugs.launchpad.net/bugs/1780233
Title:
libpng16-16 needs ZLIB_1.2.9 but package does not install it
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