Re: [boost] [clang] How to use CLang for Windows?

Subject: Re: [boost] [clang] How to use CLang for Windows?
From: Edward Diener (eldiener_at_[hidden])
Date: 2013-09-28 22:31:01

On 9/28/2013 1:26 PM, Beman Dawes wrote:
> On Tue, Sep 24, 2013 at 10:36 AM, Sergey Cheban <s.cheban_at_[hidden]> wrote:
>
>> On 24.09.2013 16:41, Jonathan Wakely wrote:
>>
>>   Beman said they want bug reports, so http://llvm.org/bugs/ seem the
>>> obvious choice.
>>>
>> I think that it is too early to fill any external bug reports for the
>> compiler that is unable to compile the first "hello world" example from the
>> Stroustrup's book.
>>
>
> I've confirmed in face-to-face discussion with several key Clang folks that
> they do indeed to want bug reports against the Windows port. In other
> words, just what Jonathan said.

Unfortunately there is still no workable Boost Build implementation of 
clang for Windows, so it is impossible to test clang with Boost Build. I 
built the latest clang from llvm/clang and then ran the tests of the 
central Boost library for all template metaprogramming, Boost.MPL, with 
clang on Windows. The results were many errors almost certainly because 
of some setup problem with clang and Boost Build:

------------------------------------------------------------

clang-linux.compile.c++.without-pth 
..\..\..\bin.v2\libs\mpl\test\largest_int.test\clang-linux-3.4\debug\largest_int.obj

   "C:/Programming/VersionControl/bclang/bin/Release/clang.exe" -c -x 
c++ -O0 -g -fno-inline -Wall -g  -DBOOST_ALL_NO_LIB=1 -I"..\..\.." -o 
"..\..\..\bin.v2\libs\mpl\test\largest_int.test\clang-linux-3.4\debug\largest_int.obj" 
"aux_\largest_int.cpp"

In file included from aux_\largest_int.cpp:14:
In file included from ..\..\..\boost/mpl/aux_/largest_int.hpp:17:
..\..\..\boost/mpl/if.hpp:131:1: error: pasting formed 
'BOOST_PP_TUPLE_ELEM_E_2(', an invalid preprocessing token 
[-Winvalid-token-paste]
BOOST_MPL_AUX_NA_SPEC(3, if_)
^
..\..\..\boost/mpl/aux_/na_spec.hpp:149:40: note: expanded from macro 
'BOOST_MPL_AUX_NA_SPEC'
#define BOOST_MPL_AUX_NA_SPEC(i, name) \
                                        ^
..\..\..\boost/mpl/aux_/na_spec.hpp:142:47: note: expanded from macro '\
BOOST_MPL_AUX_NA_SPEC_NO_ETI'
#define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \
                                               ^
..\..\..\boost/mpl/aux_/na_spec.hpp:63:9: note: expanded from macro '\
BOOST_MPL_AUX_NA_SPEC_MAIN'
         BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \
         ^
note: (skipping 5 expansions in backtrace; use -fmacro-backtrace-limit=0 
to see all)
..\..\..\boost/preprocessor/tuple/elem.hpp:36:114: note: expanded from 
macro 'BOOST_PP_TUPLE_ELEM'
#        define BOOST_PP_TUPLE_ELEM(size, n, tuple) 
BOOST_PP_TUPLE_ELEM_I(BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM_, n), 
BOOST_PP_CAT(BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM_E_, size), tuple))
 
                                           ^
..\..\..\boost/preprocessor/cat.hpp:22:32: note: expanded from macro 
'BOOST_PP_CAT'
#    define BOOST_PP_CAT(a, b) BOOST_PP_CAT_I(a, b)
                                ^
..\..\..\boost/preprocessor/cat.hpp:31:55: note: expanded from macro 
'BOOST_PP_CAT_I'
#    define BOOST_PP_CAT_I(a, b) BOOST_PP_CAT_II(~, a ## b)

------------------------------------------------------------

I doubt this is a clang problem per se since clang on Linux handles 
Boost.MPL quite easily. No doubt the default setup for clang in Windows 
under Boost Build does not work and I don't really know how to make it work.

If we ever have a build of clang for Windows that works with Boost Build 
in Windows it will be a boon for testing Boost under Windows. But it is 
not yet a reality.