> I can now confirm this is a change in GCC 10 ( from
> https://gcc.gnu.org/gcc-10/changes.html ):
> "GCC now defaults to -fno-common. As a result, global
> variable accesses are more efficient on various targets. In C,
> global variables with multiple tentative definitions now
> result in linker errors. With -fcommon such definitions are
> silently merged during linking."
> More details in:
> https://gcc.gnu.org/gcc-10/porting_to.html#common
> I am now realizing it can be tedious to rearrage the code to initialize stuff
> only once.
> -fcommon could allows us to do the bad thing for some time
+1
changing the default to n_common will probably break a lot of
programs, so IMHO this change is stupid, even if easily undone (once
you know the reason and fix)
Tom
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