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Version 1.2.12 has these key improvements over 1.2.11:
- Fix a deflate bug when using the Z_FIXED strategy that can result
in out-of-bound accesses.
- Fix a deflate bug when the window is full in deflate_stored().
- Speed up CRC-32 computations by a factor of 1.5 to 3.
- Use the hardware CRC-32 instruction on ARMv8 processors.
- Speed up crc32_combine() with powers of x tables.
- Add crc32_combine_gen() and crc32_combine_op() for fast combines.
For Linux and macOS we use the zlib provided by the OS install.
Users on Linux and macOS are advised to install the latest OS
updates if they wish to take advantage of these improvements.
Copy file name to clipboardExpand all lines: build-setup/windows.md
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@@ -87,17 +87,17 @@ Finally, copy the file `gnumake.exe` from `C:\tools\make-4.2.1\WinRel` to `C:\us
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Whilst it is possible to download a pre-built version of `zlib1.dll`, for consistency we want one that links against the Visual Studio 2019 C runtime library. Therefore it is necessary to build zlib from source.
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Download the source code from <http://zlib.net/> - the file is called `zlib1211.zip`. Unzip this file under `C:\tools`, so that you end up with a directory called `C:\tools\zlib-1.2.11`.
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Download the source code from <http://zlib.net/> - the file is called `zlib1212.zip`. Unzip this file under `C:\tools`, so that you end up with a directory called `C:\tools\zlib-1.2.12`.
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To build, start a command prompt using Start Menu -> Apps -> Visual Studio 2019 -> x64 Native Tools Command Prompt for VS 2019, then in it type:
All the build output will end up in the top level `C:\tools\zlib-1.2.11` directory. Once the build is complete, copy `zlib1.dll` and `minigzip.exe` to `C:\usr\local\bin`. Copy `zlib.lib` and `zdll.lib` to `C:\usr\local\lib`. And copy `zlib.h` and `zconf.h` to `C:\usr\local\include`.
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All the build output will end up in the top level `C:\tools\zlib-1.2.12` directory. Once the build is complete, copy `zlib1.dll` and `minigzip.exe` to `C:\usr\local\bin`. Copy `zlib.lib` and `zdll.lib` to `C:\usr\local\lib`. And copy `zlib.h` and `zconf.h` to `C:\usr\local\include`.
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### libxml2
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@@ -161,8 +161,8 @@ Start a command prompt using Start Menu -> Apps -> Visual Studio 2019 ->
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