[lldb-dev] Standalone build broken after r269332

[Pavel Labath via lldb-dev]

Ok, I see what the problem is now. If you run llvm-config from the
build folder, it will print out the correct path for the llvm headers,
but this will not be correct for the clang headers as it points
directly to the subfolder of the source llvm checkout. In Kamil's use
case this will be fine since he is presumably running an installed
llvm-config, in which case it ends up pointing us to the installed
headers under /usr/lib, and if you install clang to the same location
everything is fine.

So, it sounds to me like we should resurrect the CLANG_BUILD and
CLANG_SOURCE (a poor man's version of clang-config) variables that got
removed. There should be no need for the LLVM vars, as llvm-config
should cover that, right? Can you prepare a patch for that?

pl

On 17 May 2016 at 00:36, Eugene Zelenko via lldb-dev
<lldb-dev at lists.llvm.org> wrote:
> Hi, Pavel!
>
> On Mon, May 16, 2016 at 3:04 AM, Pavel Labath <labath at google.com> wrote:
>> Hi Eugene,
>>
>> my thoughts on this are inline.
>>
>> At which stage does the build now fail for you (after applying the
>> fixes above)?
>
> Build failed at very beginning:
>
> source/lldb.cpp:19:10: fatal error: 'clang/Basic/Version.h' file not found
>
> But there are much more places which depends on Clang headers (AST, Basic).
>
>> As Kamil said, LLDB really shouldn't depend on the clang source
>> folder. The only dependency I know of is the uglyness in lldb-mi, but
>> it looks like it should be easy to fix (basically, lldb-mi should use
>> the public regex interface instead of the private one, porting
>> appeared straight-forward), so I think someone should just bite the
>> bullet and do it. If you need any more changes after that, we can look
>> into that then.
>
> I build LLVM/Clang/ect with LLVM_INSTALL_TOOLCHAIN_ONLY=ON, so source
> and build directories are needed for headers and libraries. I try to
> save disc space for final installation and we don't use LLVM/Clang
> headers/libraries internally, so source and build directories were
> good enough for us.
>
> Eugene.
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