[llvm-dev] Debug Info is not generated for extern variables .

[David Blaikie via llvm-dev]

Any idea why this is important compared to function declarations that I
don't think any compiler emits (declarations of called but not defined
non-member functions)?

I imagine in the function case, it's assumed that the function is defined
elsewhere and the debug info for that definition will be available.

Why not the same with variables?

(admittedly, when we employ the "debug info is in another file" assumption,
that should be done under -fno-standalone-debug - but I'm not sure how far
we should take that assumption. Should we have debug info for declarations
of functions?)

There's currently at least some code that supports emitting function
declarations (for member functions) but not for variables (static member
variables are 'members' rather than 'variables')

On Fri, May 17, 2019 at 9:21 AM Umesh Kalappa via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi All,
>
> for the below case :
> $cat test.c
> extern void sharedLibTestLibRtn (int arg);
> extern int testExt;
> int main (void)
>     {
>     testExt++;
>     sharedLibTestLibRtn (5);
>
>     return 0;
>     }
> we don't see the debug-info for "testExt" i.e no DW_AT_type  entry for
> extern symbol ,where gcc has the same .
>
> we are  fixing  the same in clang as compatibility with gcc .
>
> before we start our analysis on DIBuilder in clang ,any inputs here
> will be appreciated .
>
> Thank you
> ~Umesh
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