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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.

Copying OpenSSL's sound versioning discipline, they also just added two entry points to a patch release.

First I do the 32-bit Release build:

• Edit win32/Makefile.msc and change:

  • IMPLIB

  to

  • =zlib1.lib

  • SHAREDLIB=zlib1_2.dll


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

...

• Edit win32/Makefile.msc and change:
  • IMPLIB
  to
  • =zlib1D.lib
  and SHAREDLIB to zlib1D
  •  SHAREDLIB=zlib1_2D.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

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