[GNC] Windows installer build failure, cmath error: 'copysign' has not been declared in '::' on MINGW32

[Hai Liang Wang]

So far, I know more about the problem, but haven't find a solution yet.

`cmath:2106:11: error: 'copysign' has not been declared in '::'`, this link
explain the error cause -
https://stackoverflow.com/questions/1216878/cmath-functions-generating-compiler-error

And in, `gnucash\stable\src\gnucash-git\gnucash\gnucash-core-app.hpp`, it
has

*#ifdef __MINGW32__*
*#undef _GLIBCXX_USE_C99_MATH_TR1 // Avoid cmath missing function decl.*
*#endif*

What happens in my machine, is that cmath's functions are missing, like
*copysign.*

So, how to get rid of it?
Need help, thanks.

Cheers.
Hai Liang W.


On Thu, Aug 15, 2024 at 11:32 AM Hai Liang Wang <hailiang.hl.wang at gmail.com>
wrote:

> hi, folks
>
> Run script `TARGET=gnucash-stable jhbuild -f jhbuildrc build` to build
> windows installer, come to an error -
>
> *gnucash.dir/gnucash-core-app.cpp.obj -c
> C:/gcdev64/gnucash/stable/src/gnucash-git/gnucash/gnucash-core-app.cpp*
> *In file included from
> C:/gcdev64/msys2/mingw32/include/boost/core/cmath.hpp:19,*
> *                 from
> C:/gcdev64/msys2/mingw32/include/boost/lexical_cast/detail/converter_numeric.hpp:26,*
> *                 from
> C:/gcdev64/msys2/mingw32/include/boost/lexical_cast/try_lexical_convert.hpp:31,*
> *                 from
> C:/gcdev64/msys2/mingw32/include/boost/lexical_cast.hpp:33,*
> *                 from
> C:/gcdev64/msys2/mingw32/include/boost/program_options/value_semantic.hpp:14,*
> *                 from
> C:/gcdev64/msys2/mingw32/include/boost/program_options/options_description.hpp:13,*
> *                 from
> C:/gcdev64/msys2/mingw32/include/boost/program_options.hpp:15,*
> *                 from
> C:/gcdev64/gnucash/stable/src/gnucash-git/gnucash/gnucash-core-app.hpp:31,*
> *                 from
> C:/gcdev64/gnucash/stable/src/gnucash-git/gnucash/gnucash-core-app.cpp:32:*
> *C:/gcdev64/msys2/mingw32/include/c++/14.2.0/cmath:2106:11: error:
> 'copysign' has not been declared in '::'*
> * 2106 |   using ::copysign;*
> *      |           ^~~~~~~~*
> *[124/131] Building CXX object
> gnucash/CMakeFiles/gnucash.dir/gnucash.cpp.obj*
> *FAILED: gnucash/CMakeFiles/gnucash.dir/gnucash.cpp.obj *
>
> How to fix it?
> Any suggestion is apprecaited.
>
> Other version info:
>
> *# g++ --version*
> g++.exe (Rev1, Built by MSYS2 project) 14.2.0
> Copyright (C) 2024 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> *# pacman -Q|grep c++*
> mingw-w64-i686-libc++ 18.1.8-1
>
> *# pacman -Q|grep boost*
> mingw-w64-i686-boost 1.85.0-4
>
>
> Attached the full log.
>
> Cheers.
> Hai Liang W.
>