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Dual-Linking

In order to link both zlib and zlib-ng in the same executable:

• Define ZLIB_CONST in zlib
• Compile without ZLIB_COMPAT in zlib-ng

Deflate Algorithm Comparison

Level	Zlib-ng Algorithm	Zlib Algorithm
0	Store	Store
1	Intel deflate quick	Zlib deflate fast
2-3	Zlib deflate fast	Zlib deflate fast
4-6	Intel deflate medium	Zlib deflate slow
7-9	Zlib deflate slow	Zlib deflate slow

Compile options

Building on Apple Silicon

Export following environment variables before building on Apple silicon based Macs

export ARCH_FLAGS="-arch arm64"
export SDK_NAME=macosx
export SDK_PATH=$(xcrun --show-sdk-path --sdk $SDK_NAME)
export CFLAGS="$ARCH_FLAGS -isysroot $SDK_PATH -I$SDK_PATH/usr/include"
export CXXFLAGS=$CFLAGS
export LDFLAGS="$ARCH_FLAGS"
export CC="$(xcrun -sdk $SDK_PATH --find clang) $CFLAGS"
export CXX="$(xcrun -sdk $SDK_PATH --find clang++) $CXXFLAGS"
export LD="$(xcrun -sdk $SDK_PATH --find ld) $LDFLAGS"

$ ./configure
$ make
$ make test
$ make install

Recommended Build Minimums

Below is a list of recommended build environment minimums necessary to build zlib-ng. It is possible to build zlib-ng outside of these minimums, however support for doing so is limited.

Build system versions:

• CMake 3.5.1
• Configure script (bash/gmake)
• NMake

Compiler versions:

• Clang 6.0
• GCC 5.5
• MSVC 12.0

Compiler must support the C99 standard.

Platform versions:

• Android 18
• macOS 10.9
• Ubuntu 12.04
• Windows 7

Additional Resources

• Understanding zlib
• Zlib technical details
• High Performance ZLIB Compression on Intel® Architecture Processors