[LLVMdev] RFC: Timeline for deprecating the autoconf build system?

[Reid Kleckner]

On Sat, Nov 1, 2014 at 12:29 AM, James Courtier-Dutton <
james.dutton at gmail.com> wrote:

> Hi,
>
> I use LLVM as a shared lib.
> autoconf builds a single .so for this.
> cmake builds multiple .so files.
> The multiple .so files are better for me because I only need to link
> to the ones I need, and this makes load time quicker.
> I notice that Ubuntu creates a single .so file, so it must be using
> the autoconf build method
>
> But, before dumping autoconf, I think one of the things that need
> fixing is a decision on which is the best method.
> 1) Single .so files.
> 2) Multiple .so files.
>
> Then, if (2) is decided on, make autoconf create (2) instead of (1)
> Once the output of autoconf and cmake are the same, it will be a
> painless transition, and we can then dump autoconf.
>

Chris Bieneman recently added llvm/tools/llvm-shlib which is basically just
some CMake goo to build a big DSO out of all of the LLVM libraries and
export the C interface. I think we could go ahead and bless that as the
canonical CMake way for distributions to build libLLVM.so. We probably want
to add support for exporting all C++ symbols, though, since we don't have
API export annotations in our source code.
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