Re: [Mingw-users] Mingw64 & include directory?

[Greg J. <gv...@gm...>]

On Fri, Jun 17, 2016 at 3:11 AM, Eli Zaretskii <el...@gn...> wrote:

> > From: Domonic Tom <AbD...@ho...>
> > Date: Fri, 17 Jun 2016 09:51:00 +0000
> >
> > I have installed Mingw64 on my PC. Recently I found a problem.
>
> This list is not for MinGW64 distribution.
>
> You have downloaded a minw-w64 tool distribution.  It comes with its own
version of mingw, and if it is installed
on top of the mingw/msys then mingw/include and mingw/lib will still refer
to the mingw-org system (relevant to this list)
which you installed over.

> > I built a gui toolkit called Fast Light Tool Kit (FLTK) and my build
> environment directories (using MSYS) was
> > structured as:
> >
> > c:/minw/include & c:/mingw/lib
> >
> > The problem started when I included the math.h file in my project
> #include <math.h>
> >
> > FLTK contains a math.h file which refers to usr/include/math.h which
> then directs my compiler to find the
> > math.h file in the designated include directory c:/mingw/include... But
> this is not what happens.
> >
> > My math.h c++ header is actually located in the lib directory??
> >
> > C:\mingw\lib\gcc\x86_64-w64-mingw32\5.1.0\include\c++\tr1
> >
>
You have downloaded a minw-w64 tool distribution.  It comes with its own
version of mingw, and if it is installed
on top of the mingw/msys then mingw/include and mingw/lib will still refer
to the mingw-org system (relevant to this list)
which you installed over.

 You can simplify your task immensely by installing MSYS2, which is a
rolling-release distro that uses mingw-w64 compiler builds. (Look it up on
Sourceforge.net) - MSYS2 will reside under C:\msys64 - and then you will
find that FLTK is already available to download:

$ pacman -Ss fltk
mingw32/mingw-w64-i686-fltk 1.3.3-2
    C++ user interface toolkit (mingw-w64)
mingw64/mingw-w64-x86_64-fltk 1.3.3-2
    C++ user interface toolkit (mingw-w64)


>