[cfe-dev] TargetParser - Always build all table-gen files?

[Renato Golin]

On 9 March 2015 at 12:02, Renato Golin <renato.golin at linaro.org> wrote:
> My idea is to build all table-gen files on all targets, but not build
> all targets' files and not include them in the final libraries /
> binaries. Since the table-gen'ed files don't end up there by
> themselves, only what we use from them (in the target parser) will be
> included in the final binaries.

Attached is a patch that kind of does that, but not completely. CMakes
finishes ok, but make can't find the td files.

Basically, I moved the tablegen() registration process to a separate
file (CMakeTblGen.txt), which is included from CMakeLists.txt in each
target directory and also in the root lib/Target/CMakeLists.txt, so
that I can NOT include all targets while including ALL table-gen files
that weren't included by the targets_to_build.

The problem is that, when I include it from lib/Target/CMakeLists.txt,
the tablegen(LLVM File.td -opts) makes File.td relative to its own dir
(lib/Target/File.td) and not the targets'.

The only way I can think of solving this is to change how tablegen()
handles the file name, with some "if(IS_ABSOLUTE)", but looking
further, the file name is used to more than just a filename, and gets
included in some variables names, etc. Also, I can't add another
option to the end of tablegen() because, AFAICS, this function is
variadic, with all table-gen options following the file name...

Ideas?

--renato
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