c++2rst in triqs/tprf application (parse errors in triqs?)

[HugoStrand]

Hi, I am trying to use c++2rst to generate the doc for tprf
https://github.com/HugoStrand/tprf

But the c++2rst function CL.parse encounters problems inside of triqs

[ 67%] Generating c++2rst.log
cd /Users/hugstr/dev/tprf/cbuild/doc && /Users/hugstr/apps/cpp2py/bin/c++2rst --namespace tprf /Users/hugstr/dev/tprf/doc/reference/doc_root.hpp --output_directory=/Users/hugstr/dev/tprf/cbuild/doc/cpp2doc_generated --includes=/Users/hugstr/dev/tprf/ -I /opt/local/include/openmpi-clang40 -I /opt/local/include -I /opt/local/include -I /opt/local/include -I /opt/local/include 2>&1 > c++2rst.log
Traceback (most recent call last):
  File "/Users/hugstr/apps/cpp2py/bin/c++2rst", line 36, in <module>
    libclang_location = args.libclang_location
  File "/Users/hugstr/apps/cpp2py/lib/python2.7/site-packages/cpp2rst/cpp2rst.py", line 60, in __init__
    self.root = CL.parse(filename, compiler_options, includes, libclang_location, parse_all_comments)
  File "/Users/hugstr/apps/cpp2py/lib/python2.7/site-packages/cpp2py/clang_parser.py", line 356, in parse
    raise RuntimeError, s + "\n... Your code must compile before using clang-parser !"
RuntimeError: Clang reports the following errors in parsing
 file /Users/hugstr/apps/triqs_devel/include/triqs/./gfs/../utility/complex_ops.hpp line 5 col 38
expected a type file /Users/hugstr/apps/triqs_devel/include/triqs/./gfs/../utility/complex_ops.hpp line 6 col 38
expected a type file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 75 col 5
'auto' not allowed in function return type file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 75 col 41
expected ';' at end of declaration list file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 82 col 5
'auto' not allowed in function return type file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 82 col 41
expected ';' at end of declaration list file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 88 col 5
'auto' not allowed in function return type file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 88 col 41
expected ';' at end of declaration list file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 123 col 14
unknown type name 'constexpr' file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 123 col 30
expected ';' at end of declaration list file /Users/hugstr/apps/triqs_devel/include/triqs/utility/c14.hpp line 131 col 66
a space is required between consecutive right angle brackets (use '> >') file /Users/hugstr/apps/triqs_devel/include/triqs/utility/is_complex.hpp line 27 col 55
a space is required between consecutive right angle brackets (use '> >') file /Users/hugstr/apps/triqs_devel/include/triqs/utility/../mpi/./base.hpp line 32 col 31
expected function body after function declarator file /Users/hugstr/apps/triqs_devel/include/triqs/utility/../mpi/./base.hpp line 118 col 67
expected expression file /Users/hugstr/apps/triqs_devel/include/triqs/utility/../mpi/./base.hpp line 118 col 24
'auto' not allowed in function return type file /Users/hugstr/apps/triqs_devel/include/triqs/utility/../mpi/./base.hpp line 118 col 105
expected ';' at end of declaration file /Users/hugstr/apps/triqs_devel/include/triqs/utility/../mpi/./base.hpp line 118 col 106
cannot use arrow operator on a type file /Users/hugstr/apps/triqs_devel/include/triqs/utility/../mpi/./base.hpp line 119 col 67
expected expression file /Users/hugstr/apps/triqs_devel/include/triqs/utility/../mpi/./base.hpp line 119 col 24
'auto' not allowed in function return type file None line 0 col 0
too many errors emitted, stopping now
... Your code must compile before using clang-parser !
make[2]: *** [doc/c++2rst.log] Error 1
make[2]: *** Deleting file `doc/c++2rst.log'
make[1]: *** [doc/CMakeFiles/doc_cpp2doc.dir/all] Error 2
make: *** [all] Error 2

am I doing something wrong when calling c++2rst in the above?

/Users/hugstr/apps/cpp2py/bin/c++2rst 
--namespace tprf /Users/hugstr/dev/tprf/doc/reference/doc_root.hpp 
--output_directory=/Users/hugstr/dev/tprf/cbuild/doc/cpp2doc_generated 
--includes=/Users/hugstr/dev/tprf/ 
-I /opt/local/include/openmpi-clang40 -I /opt/local/include 
-I /opt/local/include -I /opt/local/include -I /opt/local/include 
2>&1 > c++2rst.log

[parcollet]

you need to pass -std=c++14 or 17 in the --cxxflags argument.
Cf cthyb/python/..desc file
c++2py does not assume a given standard, it probably should but @Wentzell voted against it ...
@Wentzell: opinion ?

[HugoStrand]

Ok! I can get it working with -std=c++14 but it breaks in the same way if I pass -std=c++17.

[krivenko]

c++2py does not assume a given standard, it probably should but @Wentzell voted against it ...

I guess forcing the standard used by the library (C++14) would render cpp2py unusable for C++17 applications. A middle ground solution I can see is to assume -std=c++14 and optionally override it with whatever passed in --cxxflags.

[parcollet]

The pb is that if you have both -std (e.g. if we put it in the TRIQS target)
the order of the options determines the result, so it is quite confusing.
So with @Wentzell, we thought not to put -std in lib, c++2py ...