问题
My I use Eclipse Mars and MSYS2. Eclipse does not recognize my MSYS2 installation. It contains Mingw-w64 for 32 bit compilation. Things I have found on the Internet did not work. What should I do?
回答1:
Well, a bit late to the party, but it looks like there is nothing special about MSYS2: the usual procedure of setting up Eclipse to work with MinGW-w64 installation worked for me just fine.
The main issue is that as described in Eclipse CDT FAQ to detect MinGW toolchain CDT tries to find mingw32-gcc.exe in PATH, while MinGW-w64 have only gcc and i686-w64-mingw32-gcc.exe in its bin directory, so just adding MinGW-w64 bin directory to PATH won't work:
Despite having g++.exe or gcc.exe on your PATH and having defined MINGW_HOME, you may still get a “Toolchain "MinGW GCC" is not detected” message (CDT 8.4 on Luna 4.4.0). Make sure that a file called "mingw32-gcc.exe" exists in MINGW_HOME\bin.
As it mentioned further in Eclipse CDT FAQ, the easy fix would be to copy i686-w64-mingw32-gcc.exe to mingw32-gcc.exe:
If it doesn't exist (which happens with MinGW-W64), copy a -gcc.exe file (e.g. i686-w64-mingw32-gcc.exe) to mingw32-gcc.exe. If the dreaded message still lingers around, reboot your system (don't just logout and login).
After you did the copying described above, you can add MinGW-w64 bin directory to PATH and Eclipse will recognize the MinGW-w64 installation as MinGW toolchain. Since I don't like idea of polluting neither system nor user environment variables in Windows settings, I usually write a short batch file which adds MinGW-w64 bin directory to PATH and then starts Eclipse for me:
SET PATH=c:\msys32\mingw32\bin;%PATH%
START c:\eclipse\eclipse.exe
回答2:
Even more later to the party - for me worked this solution: Right click project -> Properties -> C/C++ Build -> Environment: set environment variable MINGW_HOME to C:/.../msys64/mingw64 click OK, and rest is automatically done by eclipse
来源：https://stackoverflow.com/questions/32145168/configuring-eclipse-for-using-with-msys2