Unlike the aforementioned two programs, this copy of zlib will *only*
be used for Windows builds, and it will only be used for test suites.
We're using GDI+ instead of libpng, so the only reason we need zlib
is to decompress the compressed reference BMP images used by
RpImageLoaderTest.
Changes compared to upstream zlib-1.2.8:
- Non-CMake build infratsructure has been removed.
- CMakeLists.txt has been edited to prevent building the Win32 resource
data when being built as a shared library.
- Example binaries are no longer built.
- The GZip functions are now prefixed with "mcr_z_" in order to prevent
function naming conflicts with Qt4/Win32, which has its own copy of
zlib that exposes the same functions.
- The OF() and ON() macros have been renamed to _Z_OF() and _Z_ON().
Based on Gentoo's zlib-1.2.8 patches.
- contrib/ has been stripped of everything but asm-optimized functions.
- 64-bit assembly-optimized routines now check for __x86_64__ in addition
to __amd64__ for compatibility with certain compilers, e.g. icc.
- CMakeLists.txt adds -DZLIB_CONST to the zlib and zlibstatic targets'
compile definitions.
Google Test will be used for implementing unit tests. The first set of
unit tests will be for testing RpPng with various PNG image formats.
The Google Test code is currently identical to the release archive,
except for the removal of .travis.yml and appveyor.xml.
CMakeLists.txt: Added CTest support. (see cmake/gtest.cmake)
extlibs/CMakeLists.txt: Only build googletest libraries if testing is
enabled and some project depends on them.
