[cfe-dev] #line directive ignored

[Richard Smith via cfe-dev]

On 13 February 2018 at 08:53, Frank Redeker via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hello list,
>
> I'm using ClangTool.buildASTs() to create the ASTs for a given set of
> source files.
>
> I wonder why #line directives are ignored. (Or have I missed some option
> when setting up my ClangTool instance. Or must I fix the line numbers in
> my own DiagnosticsConsumer)
>

How are you setting your DiagnosticOptions? Generally we'd expect these to
be set by a call to CompilerInvocation::CreateFromArgs, which sets
DiagnosticOptions::ShowPresumedLoc to 'true' by default (giving the output
you see from Clang). Since you're using libTooling, ToolInvocation::run()
is the place I'd expect this to happen.


> When compiling the following source
>
> #line 123 "foo"
> void foo () {
>   if (condition) {
>   }
> }
>
> clang -c test.c gives the following output:
>
> foo:123:6: error: use of undeclared identifier 'condition'
>         if (condition) {
>             ^
> 1 error generated.
>
>
> But my program gives the following output:
>
> t:\test.c:3:6: error: use of undeclared identifier 'condition'
>         if (condition) {
>             ^
> IDB32++: Fatal - Analyze terminated with errors
>
>
> Frank
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>
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