[CppAD] Compilation issue on OSX

[Norman Goldstein]

Hi, Dominique.  I have a hunch, but cannot take it too far, as I do not
have gcc 4.8, nor a sufficiently recent version of CPPAD to have
"case_six" (mine stops at 5).  The fact that

std::vector<bool>::reference {aka std::_Bit_reference}

suggests that gcc 4.8 is space-optimizing vectors of bool to be bit arrays,
and the operator |= has not been defined for bit arrays.
I checked my gcc 4.7, and the allocator<> template does not seem to
be overridden to be optimized for bool, so it looks like gcc 4.7 is not
packing things in like it seems in gcc 4.8.

Perhaps, there is some header file that contains this operator,
and it can be included manually, as a work-around.  Or, there may be
a compiler flag to not pack vector<bool>.

Sorry.  Maybe some one else can confirm or go further with this.



On 10/11/2013 11:33 AM, Dominique Orban wrote:
> I'm configuring CppAD 20130927 on OSX 10.8.4 (Xcode 4.6.3) with the following setup
>
> CC=gcc-4.8 CXX=g++-4.8 cmake .. -Dcmake_install_prefix=/tmp/cppad_install -Dcppad_testvector=std
>
> gcc-4.8 and g++-4.8 were installed via Homebrew.
>
> The configure step goes smoothly but `make check` fails with the following message:
>
> --
> [ 93%] Building CXX object test_more/CMakeFiles/test_more.dir/rev_sparse_hes.cpp.o
> /tmp/cppad-20130927/test_more/rev_sparse_hes.cpp: In function 'bool {anonymous}::case_six()':
> /tmp/cppad-20130927/test_more/rev_sparse_hes.cpp:496:22: error: no match for 'operator|=' (operand types are 'std::vector<bool>::reference {aka std::_Bit_reference}' and 'bool')
>      Check[i * n + j] |= F2[i * n + k] & r[ k * n + j];
>                       ^
> /tmp/cppad-20130927/test_more/rev_sparse_hes.cpp:496:22: note: candidates are:
> In file included from /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/ios:42:0,
>                  from /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/ostream:38,
>                  from /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/iostream:39,
>                  from /tmp/cppad-20130927/cppad/error_handler.hpp:131,
>                  from /tmp/cppad-20130927/cppad/base_require.hpp:146,
>                  from /tmp/cppad-20130927/cppad/cppad.hpp:24,
>                  from /tmp/cppad-20130927/test_more/rev_sparse_hes.cpp:14:
> /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/bits/ios_base.h:169:3: note: const std::_Ios_Iostate& std::operator|=(std::_Ios_Iostate&, std::_Ios_Iostate)
>    operator|=(_Ios_Iostate& __a, _Ios_Iostate __b)
>    ^
> /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/bits/ios_base.h:169:3: note:   no known conversion for argument 1 from 'std::vector<bool>::reference {aka std::_Bit_reference}' to 'std::_Ios_Iostate&'
> /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/bits/ios_base.h:131:3: note: const std::_Ios_Openmode& std::operator|=(std::_Ios_Openmode&, std::_Ios_Openmode)
>    operator|=(_Ios_Openmode& __a, _Ios_Openmode __b)
>    ^
> /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/bits/ios_base.h:131:3: note:   no known conversion for argument 1 from 'std::vector<bool>::reference {aka std::_Bit_reference}' to 'std::_Ios_Openmode&'
> /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/bits/ios_base.h:91:3: note: const std::_Ios_Fmtflags& std::operator|=(std::_Ios_Fmtflags&, std::_Ios_Fmtflags)
>    operator|=(_Ios_Fmtflags& __a, _Ios_Fmtflags __b)
>    ^
> /usr/local/Cellar/gcc48/4.8.1/gcc/include/c++/4.8.1/bits/ios_base.h:91:3: note:   no known conversion for argument 1 from 'std::vector<bool>::reference {aka std::_Bit_reference}' to 'std::_Ios_Fmtflags&'
> make[3]: *** [test_more/CMakeFiles/test_more.dir/rev_sparse_hes.cpp.o] Error 1
> make[2]: *** [test_more/CMakeFiles/test_more.dir/all] Error 2
> make[1]: *** [CMakeFiles/check.dir/rule] Error 2
> make: *** [check] Error 2
> --
>
> This error does not occur if I use either the boost, eigen of cppad test vector options. According to Brad Bell, the error does not occur on Linux with gcc-4.8. It might be OSX specific. My C++ is nonexistent, so I don't understand the error message.
>
> Other things I've tried:
>
> - change the version of gcc: all lead to the same error
> - use clang / clang++ instead of gcc / g++: same error
> - add CXXFLAGS='-std=c++11' or CXXFLAGS='-std=c++11 -stdlib=libc++': same error.
>
> My goal is to submit a Homebrew [1] formula for CppAD to the Homebrew/Science tap [2]. My current formula is available from [3]. Any feedback would be greatly appreciated.
>
> Thanks!
>
> Dominique
>
>
> [1] http://brew.sh
> [2] https://github.com/Homebrew/homebrew-science
> [3] https://gist.github.com/6938726
> _______________________________________________
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> CppAD at list.coin-or.org
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>


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