[cfe-dev] Running Tool In VS2015

Daniel Dilts via cfe-dev cfe-dev at lists.llvm.org
Tue Sep 13 16:12:34 PDT 2016

When building my tool against Clang 3.8.0 and running it in VS2013 it
worked perfectly (once I started building the clang-headers project).

Along comes VS2015 and I have to upgrade to Clang 3.9.0 since the VS2015
headers now use an intrinsic that wasn't supported prior to 3.9.0.  This
unexpectedly broke my tool and caused the tool to generate the following
new warning:

warning : unknown argument ignored in clang-cl:

This warning seems odd to me, since the -resource-dir argument is added by
Clang.  Also, it references the parent directory of the directory that
the clang-headers project copies necessary include files to.

As I have been experimenting with getting my tool to work again it has
become evident that somewhere between 3.8.0 and 3.9.0 the directory where
the clang-headers project copies header file to has been removed from the
set of include directories for a tool (at least on Windows...).  By adding
-IC:\MyTool\Release\..\lib\clang\3.9.0\include to my command line I have
been able to get my tool to work again.

Does anyone know why Clang was changed so that this directory is no longer
included by default?  Also, is there some other fix that I am missing?
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