[PATCH] Fix libstdc++-v3/include/math.h:66:1 2: error: 'constexpr bool std::isnan(double)' conflicts with a previous declaration

Jonathan Wakely jwakely@redhat.com
Fri Feb 5 01:01:00 GMT 2016


On 04/02/16 22:41 +0000, Jonathan Wakely wrote:
>On 04/02/16 17:31 -0500, John David Anglin wrote:
>>On 2016-02-04 5:11 PM, Gerald Pfeifer wrote:
>>>In file included from .././../gcc-6-20160131/gcc/genautomata.c:116:0:
>>>/wrkdirs/usr/ports/lang/gcc6-devel/work/gcc-6-20160131/libstdc++-v3/include/c_compatibility/math.h:65:12:
>>>error: 'constexpr bool std::isinf(double)' conflicts with a previous declaration
>>> using std::isinf;
>>>            ^~~~~
>>>
>>>See
>>>http://beefy2.nyi.freebsd.org/data/93amd64-default/408008/logs/gcc6-devel-6.0.0.s20160131.log  
>>>for a full log.
>>The checks for obsolete isinf(double) and isnan(double) are not run 
>>on freebsd.  Apparently,
>>the checks in acinclude.m4 need to be run on freebsd as well.  Maybe 
>>the checks should run almost
>>everywhere?
>
>Yes, maybe. I didn't realise those functions were so widespread, but
>if they are I'm amazed more people weren't yelling about
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48891
>
>>The problem wasn't introduced by my change but earlier by Jonathan. 
>>I added hpux to the list
>>of systems with obsolete defines.  The default is to assume there 
>>are no obsolete defines.
>
>I think it should be harmless to run the checks on all systems. If
>they don't have obsolete defines we'll detect that. If they do things
>will start working.

This works on powerpc64-linux (with glibc 2.18 which does define those
functions) and x86_64-freebsd10.2 (which doesn't define them).

Can anyone else test this on an older FreeBSD or other target that
isn't gnu/aix/hpux?

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