[llvm-dev] Windows vs Mac/Linux distribution discrepancy

[Aaron Smith via llvm-dev]

The Visual Studio installer has an option to install Clang tools for
Windows or you can build from source. I believe all the tools are not
included in the prebuilt package because of size.

On Thu, Jul 23, 2020 at 11:32 AM Dimitry Andric via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> On 23 Jul 2020, at 20:00, Alex Denisov via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > I’m trying to port some code built on top of LLVM/Clang to Windows,
> > however I just discovered that the precompiled versions from
> releases.llvm.org
> > are missing all the libLLVM* and libclang* dlls.
>
> This is controlled by the following CMake settings (see
> https://llvm.org/docs/CMake.html#llvm-specific-variables):
>
> LLVM_BUILD_LLVM_DYLIB:BOOL
>
> If enabled, the target for building the libLLVM shared library is added.
> This library contains all of LLVM’s components in a single shared library.
> Defaults to OFF. This cannot be used in conjunction with BUILD_SHARED_LIBS.
> Tools will only be linked to the libLLVM shared library if
> LLVM_LINK_LLVM_DYLIB is also ON. The components in the library can be
> customised by setting LLVM_DYLIB_COMPONENTS to a list of the desired
> components. This option is not available on Windows.
>
> LLVM_LINK_LLVM_DYLIB:BOOL
>
> If enabled, tools will be linked with the libLLVM shared library. Defaults
> to OFF. Setting LLVM_LINK_LLVM_DYLIB to ON also sets LLVM_BUILD_LLVM_DYLIB
> to ON. This option is not available on Windows.
>
> E.g. these options are off by default (probably because it saves build
> time, but I'm just guessing here), and are not available on Windows (for
> reasons unknown to me).
>
>
> > Also, some tools (e.g. opt) are missing on Windows as well.
>
> I don't know about that, but maybe Hans Wennborg has more information.
>
>
> > I’m curious whether it’s a technical limitation (i.e. certain things
> don’t work on Windows),
> > or something else?
> >
> > For the others out there building cross-platform tools based on LLVM:
> > how do you deal with this issue? Am I supposed to build LLVM myself
> there?
>
> Either you can link against distro-provided LLVM dynamic libraries, like
> those shipped by Debian and Ubuntu, or you can link against the static
> libraries in the release tarballs.
>
> But obviously, you could always build them yourself, and ship them with
> your tools. This would give you the most flexibility.
>
> -Dimitry
>
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