+ lib_cflags => add(sub { $disabled{shared} ? "/MT /Zl" : () }),
+ # Following might/should appears controversial, i.e. defining
+ # /MDd without evaluating $disabled{shared}. It works in
+ # non-shared build because static library is compiled with /Zl
+ # and bares no reference to specific RTL. And it works in
+ # shared build because multiple /MDd options are not prohibited.
+ # But why /MDd in static build? Well, basically this is just a
+ # reference point, which allows to catch eventual errors that
+ # would prevent those who want to wrap OpenSSL into own .DLL.
+ # Why not /MD in release build then? Well, some are likely to
+ # prefer [non-debug] openssl.exe to be free from Micorosoft RTL
+ # redistributable.
+ bin_cflags => add(picker(debug => "/MDd",
+ release => sub { $disabled{shared} ? "/MT" : () },
+ )),