[Octave-bug-tracker] [bug #46065] conflicting declarations of max_align_t since gnulib update

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?46065>

                 Summary: conflicting declarations of max_align_t since gnulib
update
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Mon Sep 28 12:12:01 2015
                Category: Configuration and Build System
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: GNU/Linux

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Details:

Back in Octave 3.8 it was possible to build Octave with C++11.  Now, it fails
to build due to conflicting declarations of max_align_t by both gnulib and
gcc:


make[3]: Entering directory '/home/carandraug/builds/octave/liboctave'
  CXX      array/array_libarray_la-Array-b.lo
In file included from /usr/include/c++/4.9/cstddef:45:0,
                 from /home/carandraug/dev/octave/liboctave/array/Array.h:30,
                 from
/home/carandraug/dev/octave/liboctave/array/Array-b.cc:29:
../libgnu/stddef.h:93:3: error: conflicting declaration 'typedef union
max_align_t max_align_t'
 } max_align_t;
   ^
In file included from ../libgnu/stddef.h:55:0,
                 from /usr/include/c++/4.9/cstddef:45,
                 from /home/carandraug/dev/octave/liboctave/array/Array.h:30,
                 from
/home/carandraug/dev/octave/liboctave/array/Array-b.cc:29:
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/stddef.h:425:3: note: previous
declaration as 'typedef struct max_align_t max_align_t'
 } max_align_t;
   ^
Makefile:6887: recipe for target 'array/array_libarray_la-Array-b.lo' failed


The cause of the issue is our update of gnulib with cset 85d9cb769e8b.

I'm unsure if this bug is ours or gnulib but indeed, my config.log file has:


HAVE_MAX_ALIGN_T='0'


To reproduce, simply:


$ CXXFLAGS='-std=gnu++11 -g -O2' ~/dev/octave/configure && make






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