[cfe-dev] LibTooling in the absence of a compilation database

Manuel Klimek via cfe-dev cfe-dev at lists.llvm.org
Wed Dec 2 01:39:17 PST 2015

On Wed, Dec 2, 2015 at 10:35 AM Russell Wallace via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Tools built with LibTooling default to using a compilation database if one
> is available, which is good.
> In the case where a compilation database is not available, there is a
> problem: the default behavior is to exit with an error message, whereas in
> some cases the tool would be required to do the best it can anyway. This
> can be achieved by adding -- to the end of the command line, but this
> wouldn't be obvious to someone unfamiliar with Clang tools.
> One solution would be for the program to append -- to argv if it's not
> already present, but would this disable the default useful behavior of
> reading the compilation database if it is available?
> If so, is there a way for the program to say 'okay, check for a
> compilation database as normal, but if it's not present, let me know and
> I'll fill in some best-guess default options'?

The problem is that for C++ there really are no best guess default options.
If you have ideas for what they should be, please make a proposal.

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