[patch][cmake] Use -Wl,defs when linking

[Chandler Carruth]

LGTM

On Tue, Jan 20, 2015 at 1:00 PM, Rafael Espíndola <
rafael.espindola at gmail.com> wrote:

> ELF linkers by default allow shared libraries to contain undefined
> references and it is up to the dynamic linker to look for them.
>
> On COFF and MachO, that is not the case.
>
> This creates a situation where a .so might build on an ELF system, but
> the build of the corresponding .dylib or .dll will fail.
>
> The attached patch changes the cmake build to use -Wl,-z,defs when
> linking and updates the dependencies so that -DBUILD_SHARED_LIBS=ON
> build still works.
>
> Cheers,
> Rafael
>
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