[cfe-dev] standalone tool: best way to find built-in includes?

[Sean Silva]

You can set CLANG_RESOURCE_DIR in CMake, or pass -resource-dir (the default
resource dir is created by `llvm::sys::path::append(<exe-path>, "..",
"lib", "clang", CLANG_VERSION_STRING)`).

This logic is actually duplicated in more than one place unfortunately.
e.g. in CompilerInvocation::GetResourcesPath
(lib/Frontend/CompilerInvocation.cpp) and Driver::Driver
(lib/Driver/Driver.cpp); there's also some nastiness in
CIndexer::getClangResourcesPath. Needs some refactoring.

-- Sean Silva

On Thu, Nov 20, 2014 at 6:32 PM, Christian Convey <
christian.convey at gmail.com> wrote:

> Hi guys,
>
> I'm developed a standalone tool for analyzing source code.  It uses
> CommonOptionParser and ClangTool in what I think are the standard
> ways.
>
> My tool analyzes some other code ("foo.c") we have.  We build foo.c
> with clang the system-wide installed version of clang.  Thanks to
> cmake, we also produce a compilation database for that build of foo.c.
>
> I'd really like to ensure that when my analysis tool runs, I'd like it
> to simulate, as closely as possible, the way we normally build foo.c.
> In particular, I'd like to be sure it's using the same builtin headers
> and gcc-provided headers.
>
> Unfortunately, I can't easily copy my analysis tools executable into
> the same directory as the clang which we use to build foo.c.
>
> So here's my question: Is there a good way for me to force my tool to
> search the same include directories, in the same order, as our normal
> copy of clang does when it's building foo.c?
>
> I've tried running "clang -### ..." in the build system for foo.c, so
> that (I think) I get explicit information about the flags being passed
> to the front-end.  However, I haven't found a way to pass those flags
> to my analysis tool in a way that CommonOptionsParser and/or ClangTool
> find acceptable.  For example, they reject "-cc1".
>
> Thanks,
> Christian
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