mkmf.log file:

have_library: checking for main() in libmysql.lib... 
-------------------- no

"cl -nologo -Feconftest -I. -Ic:/ruby/lib/ruby/1.8/i386-mswin32 
-IC:/ruby/lib/ruby/gems/1.8/gems/mysql-ruby-2.8pre4 
-Ic:/ruby/lib/ruby/1.8/i386-mswin32  -MD -Zi -O2b2xg- -G6 conftest.c 
msvcrt-ruby18-static.lib libmysql.lib  oldnames.lib user32.lib 
advapi32.lib ws2_32.lib   -link    -libpath:"." -libpath:"c:/ruby/lib" 
-stack:0x2000000"
checked program was:
/* begin */
1: #define WIN32_LEAN_AND_MEAN
2: #include <winsock2.h> 
3: #include <windows.h> 
4:
5: /*top*/
6: int main() { return 0; }
7: int t() { void ((*volatile p)()); p = (void ((*)()))main; return 0; }
/* end */

"cl -nologo -Feconftest -I. -Ic:/ruby/lib/ruby/1.8/i386-mswin32 
-IC:/ruby/lib/ruby/gems/1.8/gems/mysql-ruby-2.8pre4 
-Ic:/ruby/lib/ruby/1.8/i386-mswin32  -MD -Zi -O2b2xg- -G6 conftest.c 
msvcrt-ruby18-static.lib libmysql.lib  oldnames.lib user32.lib 
advapi32.lib ws2_32.lib   -link    -libpath:"." -libpath:"c:/ruby/lib" 
-stack:0x2000000"
checked program was:
/* begin */
1: /*top*/
2: int main() { return 0; }
3: int t() { main(); return 0; }
/* end */

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