[Bug c++/92951] New: extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

Bug ID: 92951
   Summary: extern variable declaration doesn't behave properly
for me
   Product: gcc
   Version: unknown
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: fportera2 at gmail dot com
  Target Milestone: ---

I have a global variable 'traindata' declared in cnn.cpp:

arma::mat traindata;

, I'm importing this varible in mean_squared_error.hpp:

#include 

extern arma::mat traindata;

and I'm trying to exploit this variable in mean_squared_error_impl.hpp (that
includes 'mean_squared_error.hpp'), for example:

printf("n_rows = %d, n_cols = %d\n", traindata.n_rows, traindata.n_cols);

but it gives me that the dimensions are 0's (while in the cnn.cpp' main() they
are positive).

thanks

[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

--- Comment #2 from Filippo Portera  ---
I printf the variable dimensions both in the main() that in:

void MeanSquaredError::Backward(
  int begin, int batch_size,
  const InputType&& input,
  const TargetType&& target,
  OutputType&& output)
{
  double gamma = 1;
  printf("n_rows = %d, n_cols = %d\n", traindata.n_rows, traindata.n_cols);


that I'm sure it is called inside the main function and before the first
main's printf.





Il giorno lun 16 dic 2019 alle ore 09:39 pinskia at gcc dot gnu.org <
gcc-bugzi...@gcc.gnu.org> ha scritto:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951
>
> --- Comment #1 from Andrew Pinski  ---
> Is the printf before or after main?
>
> If before, then the problem is the order of variables initialized from
> different translational units is unspecified and therefore undefined.
>
> If after, then maybe something is changing them.
>
> --
> You are receiving this mail because:
> You reported the bug.

[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

--- Comment #4 from Filippo Portera  ---
Created attachment 47503
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47503&action=edit
main file

where training is defined

[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

--- Comment #5 from Filippo Portera  ---
Created attachment 47504
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47504&action=edit
include file

where training is declared as extern

[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

--- Comment #6 from Filippo Portera  ---
Created attachment 47505
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47505&action=edit
implementation file

where I would like to use the training variable

[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

Filippo Portera  changed:

   What|Removed |Added

 Resolution|INVALID |FIXED

[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

--- Comment #9 from Filippo Portera  ---
Fixed!
Thanks a lot!

Il giorno lun 16 dic 2019 alle ore 12:28 pinskia at gcc dot gnu.org <
gcc-bugzi...@gcc.gnu.org> ha scritto:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951
>
> --- Comment #8 from Andrew Pinski  ---
> NOTE yes there is a missing -Wshadow warning, I will file it in a second.
>
> --
> You are receiving this mail because:
> You reported the bug.

[Bug c++/92951] extern variable declaration doesn't behave properly for me

[fportera2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92951

Filippo Portera  changed:

   What|Removed |Added

 Resolution|INVALID |WORKSFORME