Yes, this is a MPIR bug. In mpir.h, the following takes place:
#define __need_size_t /* tell gcc stddef.h we only want size_t */
#include <cstddef> /* for size_t */
As expected from changing implementation macros, his breaks sooner or later:
$ gcc -std=c++11 align.cc
In file included from align.cc:2:0:
/usr/include/c++/4.9.2/cstddef:51:11: error: â::max_align_tâ has not been
declared
using ::max_align_t;
^
On Tuesday, November 18, 2014 2:39:32 PM UTC, Dima Pasechnik wrote:
>
> basically, current (upstream) normaliz does not compile with gcc 4.9.2;
> (with Sage 4.5.beta0).
> I tracked it down to the following test, showing that mpir(xx) does
> something strange...
>
> $ cat b.cpp
> #include <mpirxx.h>
> int main()
> {
> return alignof(std::max_align_t);
> }
>
> $ g++ -std=c++11 -c b.cpp
> In file included from
> /home/scratch/dimpase/sage/sage6.3/local/include/mpir.h:53:0,
> from
> /home/scratch/dimpase/sage/sage6.3/local/include/mpirxx.h:44,
> from b.cpp:1:
> /home/scratch/dimpase/sage/sage6.3/local/include/c++/4.9.2/cstddef:51:11:
> error: '::max_align_t' has not been declared
> using ::max_align_t;
> ^
> b.cpp: In function 'int main()':
> b.cpp:6:20: error: 'max_align_t' is not a member of 'std'
> return alignof(std::max_align_t);
>
> e$ g++ -v
> Using built-in specs.
> COLLECT_GCC=/home/scratch/dimpase/sage/sage6.3/local/bin/g++
> COLLECT_LTO_WRAPPER=/home/scratch/dimpase/sage/sage6.3/local/libexec/gcc/x86_64-unknown-linux-gnu/4.9.2/lto-wrapper
>
>
> Target: x86_64-unknown-linux-gnu
> Configured with: ../src/configure
> --prefix=/home/scratch/dimpase/sage/sage6.3/local
> --with-local-prefix=/home/scratch/dimpase/sage/sage6.3/local
> --with-gmp=/home/scratch/dimpase/sage/sage6.3/local
> --with-mpfr=/home/scratch/dimpase/sage/sage6.3/local
> --with-mpc=/home/scratch/dimpase/sage/sage6.3/local --with-system-zlib
> --disable-multilib --disable-nls --enable-languages=c,c++,fortran
> --disable-libitm
> Thread model: posix
> gcc version 4.9.2 (GCC)
>
>
>
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