Re: Error compiling bison 3.4.2 on Solaris

[Akim Demaille]

Hi Paul,

> Le 22 oct. 2019 à 20:10, Paul Eggert <address@hidden> a écrit :
> 
> On 10/21/19 2:07 AM, Akim Demaille wrote:
> 
>>> I'd rather not. Newer compilers are doing their jobs better in this area,
>> I don't see that, given that I have the problem with GCC 7, 8 and 9 on macOS.
> 
> That's odd. What problems are these?

Everything I already reported :)  See

https://lists.gnu.org/archive/html/bug-bison/2019-10/msg00061.html

and

https://lists.gnu.org/archive/html/bug-bison/2019-10/msg00063.html

both being about GCC9

> GCC 9 should have the necessary primitives to bypass the code eliciting the 
> warnings you mentioned; besides, recent GCCs are better at avoiding false 
> alarms with options like -Wtype-limits. I don't see why macOS GCC 9 would 
> differ from GNU/Linux GCC 9 in this area.

I know.  That's why I wrote

>> Except that on this mac GCC 7 to 9 shows the warning.  I don't understand 
>> [why] there's a difference with GNU/Linux.


Maybe we should compare our outputs with -E of the small example I
used in the second URL?

> I just built Bison master with the attached patch (./configure 
> --enable-gcc-warnings --disable-nls), and "make" and "make check" both 
> succeeded on Fedora 30 with GCC 9.2.1 20190827 (Red Hat 9.2.1-1). How does 
> such a build fail for you with macOS 9 and GCC 9.2?
> <type-limits.diff>

Yes, this is 9.2.0 and I have back all the warnings reported in the
first URL.