Looks like this might be the root:
https://gcc.gnu.org/gcc-4.9/porting_to.html
Unformatted quoting:
"""
Header <cstddef> changes
The <cstddef> header was updated for C++11 support and this breaks some
libraries which misuse macros meant for internal use by GCC only. For
instance with GMP versions up to 5.1.3, you may see:
/usr/include/c++/4.9.0/cstddef:51:11: error: ‘::max_align_t’ has not been
declared
using ::max_align_t;
^
Another possible error is:
someheader.h:99:13: error: ‘ptrdiff_t’ does not name a type
A workaround until libraries get updated is to include <cstddef> or
<stddef.h> before any headers from that library.
"""
On 18 November 2014 15:39, Dima Pasechnik <[email protected]> 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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