zlib

zlib is a common compression library that OpenSAML relies on for deflate/inflate support.

zlib is provided with most Linux and Unix operating systems.

Non-Windows

If you're building from source on a non-Windows platform, a default build is generally fine.

Windows

On Windows, zlib is pretty much a mess. The only modern project files are for building a DLL that uses the WINAPI calling convention for Visual Basic applications, and the default Makefile doesn't handle debug builds, or create properly versioned DLL and import library names. Short of a total rewrite, I built this by manually adjusting the makefile with different settings, running a build, and then copying the output files into separate directories.

First I do the 32-bit Release build:

Edit win32/Makefile.msc and change IMPLIB to zlib1.lib
nmake /f win32\Makefile.msc
mkdir Release
copy zlib1.* Release
nmake /f win32\Makefile.msc clean

Now, the 64-bit Release build, switching to the x64 Tools command prompt:

mkdir x64
mkdir x64\Release
nmake /f win32\Makefile.msc
copy zlib1.* x64\Release
nmake /f win32\Makefile.msc clean

Now the 32-bit Debug build, switching to the 32-bit Tools command prompt:

Edit win32/Makefile.msc and change IMPLIB to zlib1D.lib and SHAREDLIB to zlib1D.dll
Change CFLAGS and turn /MD into /MDd, and add -D_DEBUG to WFLAGS
nmake win32/Makefile.msc
mkdir Debug
copy zlib1D.* Debug
nmake /f win32\Makefile.msc clean

Now, the 64-bit Debug build, switching back to the x64 Tools command prompt:

mkdir x64\Debug
nmake /f win32\Makefile.msc
copy zlib1D.* x64\Debug
nmake /f win32\Makefile.msc clean