clang -shared -Wl,--out-implib,libzdll.a  \
        -o zlib1.dll win32/zlib.def adler32.o compress.o crc32.o deflate.o gzclose.o gzlib.o gzread.o gzwrite.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o  zlibrc.o
clang: warning: argument unused during compilation: '-shared'
clang: error: unable to execute command: program not executable
clang: error: linker command failed due to signal 1 (use -v to see invocation)
strip zlib1.dll
c:\MinGW\bin\strip.exe: 'zlib1.dll': No such file
make: *** [zlib1.dll] Error 1