Miro Hrončok wrote:
> https://gcc.gnu.org/gcc-10/porting_to.html#common
>
> "Default to -fno-common
>
> A common mistake in C is omitting extern when declaring a global variable
> in a header file. If the header is included by several files it results in
> multiple definitions of the same variable. In previous GCC versions this
> error is ignored. GCC 10 defaults to -fno-common, which means a linker
> error will now be reported. To fix this, use extern in header files when
> declaring global variables, and ensure each global is defined in exactly
> one C file. As a workaround, legacy C code can be compiled with -fcommon.
>
>
> int x; // tentative definition - avoid in header files
>
> extern int y; // correct declaration in a header file"
I fail to see how this kind of incompatible change that breaks hundreds of
packages (and certainly a lot more software out there) is an improvement.
Kevin Kofler
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