[PATCH] debug/93751 Generate DIEs for external variables with -g1

[Alexey Neyman]

On 2/14/20 4:36 PM, Alexey Neyman wrote:
> Hi all,
>
> As reported here, 
> https://gcc.gnu.org/ml/gcc-help/2020-02/msg00062.html, GCC does not 
> behave according to manual when `-gdwarf -g1` options are used; it 
> does not generate the debugging information for external variables 
> even though it is supposed to (and it does so for other debugging 
> formats):
>
> aneyman@supox:/tmp$ cat foo.c
> int foo __attribute__((externally_visible));

Just as a clarification, the __attribute__((externally_visible)) is not 
needed; this is copied from the original bug report to gcc-help mailing 
list where it indicated that neither external linkage nor this attribute 
made GCC behave as described in the manual.


Regards,
Alexey.

>
> aneyman@supox:/tmp$ gcc -c -O2 -gdwarf -g1 foo.c
> aneyman@supox:/tmp$ readelf -wi foo.o
> aneyman@supox:/tmp$ gcc -c -O2 -gdwarf -g2 foo.c
> aneyman@supox:/tmp$ readelf -wi foo.o
> ...
> <1><1d>: Abbrev Number: 2 (DW_TAG_variable)
>     <1e>   DW_AT_name        : foo
>
>
> The attached patch fixes this issue.
>
> Regards,
> Alexey.
>