Re: [Gcl-devel] The perils of gcc 5.x

[Jerry James]

On Thu, Jun 18, 2015 at 10:08 PM, Jerry James <address@hidden> wrote:
> Greetings,
>
> Fedora is now building packages with gcc 5.x.  The gcl package build
> for Fedora Rawhide (the upcoming Fedora 23 release) is failing with
> gcc 5.1.1.  Part of the reason is that gcc now defaults to the C11
> standard when building C code.  This breaks the gcl build, because the
> "inline" keyword now defaults to meaning "static inline", where it
> used to default to meaning "extern inline".  This leads to lots of
> duplicate symbols AND lots of missing symbols at link time.

I didn't say this quite right.  This page describes the issue much better:

https://gcc.gnu.org/onlinedocs/gcc/Inline.html

Essentially what happened is that gcc 5.x switched to building C code
with C11 semantics by default, which means the semantics of the inline
keyword changed.  GCL code is written to assume the C89 semantics, so
everything broke.  Those building with gcc 5.x will need to add
-std=c89 or -std=gnu89 to CFLAGS.

> So somewhere the preprocessor is getting invoked and needs the -P flag
> to suppress those line numbers, I guess.  I'm not sure where to look.
> Any suggestions would be greatly appreciated.

This fixes the problem:

sed -i 's,$(CC) -E,& -P,' makefile

Regards,
-- 
Jerry James
http://www.jamezone.org/