[llvm-dev] Errors in configuration for LLVM with CMake GUI

[Jonathan Goodwin via llvm-dev]

I checked your CMakeError.log again. The .h include files it is marking as
missing are not LLVM include files, but are OS-related (e.g.,
malloc/malloc.h), and in some cases appear to be potentially Linux ones
(dlfcn.h, sys/ioctl, malloc_np.h). I can't imagine why your build might be
looking for Linux as opposed to Windows include files. That could be a clue
to your problem.

You said you installed the latest version of GCC before this attempt. This
confuses me further, since you are using Visual Studio to build with, and
that makes no use of GCC. In fact, honestly I am wondering if your GCC
implementation libraries are somehow in your search path wrt environment
variables, and your build is actually trying to use the GNU/Linux header
files rather than the VS Windows header files, which would certainly blow
it up. Again, I am no expert here, so I don't have a definite answer, but
based on what little I know, this setup doesn't sound safe. Maybe get rid
of GCC completely, as I am not sure when/how you would even use it on the
Windows side.

Similarly, I don't believe Perl has anything to do with this either, as
neither CMake nor VS make any use of it. But I can't imagine it causing any
problems for you to have it.

I don't know anything about Backtrace, Libomp, Compiler-RT, so I cannot
help you there. As we have discussed before, the source for clang and lld
go into the llvm source folder's "tools" folder by those names. If they are
there, after the configure step of the CMake-Gui, options will
automatically appear for both clang and lld. You will want to mouse click
the checkbox next to CLANG_BUILD_TOOLS and LLD_BUILD_TOOLS prior to hitting
the generate button.

Sorry I don't know more than that, but hopefully that will help some ...
and then others can chime in if they know more about this than me.

On Thu, Nov 29, 2018 at 2:52 PM Osman Zakir via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> I tried to configure CMake for LLVM using the GUI and I've attached the
> logs for the attempt to this message.  I installed Perl and the latest
> version of GCC before that attempt.  There were still errors that stopped
> it from being able to generate project files, though.
>
> I'd like to know how I can get this to work.  How do I tell it where to
> find Backtrace, Libomp, Compiler-RT, LLD and Clang?  And where exactly is
> Backtrace?  I copy-pasted the locations for the stuff I checked out for
> LLVM, so I'm not really sure where the stuff I need to put into CMake for
> Compiler-RT, Backtrace and Libomp is (it's where it should be, that's all I
> know).
>
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