[Bug default/25455] New: Build fails with GCC 10 due to a common variable in pvm-vm.h

[jose.marchesi at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25455

            Bug ID: 25455
           Summary: Build fails with GCC 10 due to a common variable in
                    pvm-vm.h
           Product: poke
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: unassigned at sourceware dot org
          Reporter: jose.marchesi at oracle dot com
                CC: poke-devel at gnu dot org
  Target Milestone: ---

Jitter generates a common variable in pvm-vm.h:

struct jitter_list_header * const pvm_states;

This makes the linker fails complaining because of multiple
definitions of `pvm_states', since gcc 10 uses -fno-common by default.

It shall be possible to include pvm-vm.h several times.
This is something that will surely impact every jitter user with GCC
10.

Reported alredy to Luca Saiu.
This bug is here to make sure this gets fixed in Jitter and the fix
made available to poke.

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