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Re: Build failures on GCC 10 due to -fno-common default

From: Till Hofmann
Subject: Re: Build failures on GCC 10 due to -fno-common default
Date: Fri, 7 Feb 2020 09:32:19 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/7/20 9:31 AM, Till Hofmann wrote:
> Hi all,
> gprolog currently fails to build on Fedora Rawhide due to a change in
> GCC 10. With GCC 10, it is no longer allowed to have multiple
> definitions of the same variable, which may happen if the variable is
> declared in a header without extern. This causes errors such as this:
> /usr/bin/ld:
> /builddir/build/BUILD/gprolog-1.4.5/src/Linedit/liblinedit.a(terminal.o):/builddir/build/BUILD/gprolog-1.4.5/src/Linedit/linedit.h:92:
> multiple definition of `pl_le_hook_set_line_buffering';
> /builddir/build/BUILD/gprolog-1.4.5/src/BipsPl/libbips_pl.a(stream_c.o):/builddir/build/BUILD/gprolog-1.4.5/src/Linedit/linedit.h:92:
> first defined here
> GCC has an explanation and porting instructions:
> https://gcc.gnu.org/gcc-10/porting_to.html#common
> I can re-enable -fcommon for Fedora builds. However, the recommended way
> to fix this is to actually fix the code.
> Kind regards,
> Till

Here's the Fedora BZ ticket with more logs:

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