參考
命令行中使用
安裝Qt的時候，安裝了mingw，所以就不單獨安裝了，
將這個路徑添加到Path，
msys
使用mingw-get-setup.exe安裝msys，修改C:\MinGW\msys\1.0\etc\fstab，注意路徑的斜槓，msys不需要配置環境變量
# Win32_Path Mount_Point
#------------------------------------- -----------
#C:/MinGW /mingw
C:/Qt/Qt5.9.8/Tools/mingw530_32 /mingw
測試，ls命令並沒有把mount目錄顯示出來，但是gcc已經可以使用了，
zc@DESKTOP-KVKC06A ~$ ls /
bin etc home m.ico msys.bat msys.ico postinstall sbin share
zc@DESKTOP-KVKC06A ~$ mount
C:\Qt\Qt5.9.8\Tools\mingw530_32 on /mingw type user (binmode)
C:\Users\zc\AppData\Local\Temp on /tmp type user (binmode,noumount)
C:\MinGW\msys\1.0 on /usr type user (binmode,noumount)
C:\MinGW\msys\1.0 on / type user (binmode,noumount)
c: on /c type user (binmode,noumount)
d: on /d type user (binmode,noumount)
e: on /e type user (binmode,noumount)
z: on /z type user (binmode,noumount)
zc@DESKTOP-KVKC06A ~$ cd /mingw/
bin/ etc/ include/ libexec/ opt/
build-info.txt i686-w64-mingw32/ lib/ licenses/ share/
zc@DESKTOP-KVKC06A ~$ gcc -v
Using built-in specs.
COLLECT_GCC=C:\Qt\Qt5.9.8\Tools\mingw530_32\bin\gcc.exe
COLLECT_LTO_WRAPPER=C:/Qt/Qt5.9.8/Tools/mingw530_32/bin/../libexec/gcc/i686-w64-mingw32/5.3.0/lto-wrapper.exe
Target: i686-w64-mingw32
Configured with: ../../../src/gcc-5.3.0/configure --host=i686-w64-mingw32 --build=i686-w64-mingw32 --target=i686-w64-mingw32 --prefix=/mingw32 --with-sysroot=/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32 --with-gxx-include-dir=/mingw32/i686-w64-mingw32/include/c++ --enable-shared --enable-static --disable-multilib --enable-languages=c,c++,fortran,lto --enable-libstdcxx-time=yes --enable-threads=posix --enable-libgomp --enable-libatomic --enable-lto --enable-graphite --enable-checking=release --enable-fully-dynamic-string --enable-version-specific-runtime-libs --disable-sjlj-exceptions --with-dwarf2 --disable-isl-version-check --disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --with-gnu-as --with-gnu-ld --with-arch=i686 --with-tune=generic --with-libiconv --with-system-zlib --with-gmp=/c/mingw530/prerequisites/i686-w64-mingw32-static --with-mpfr=/c/mingw530/prerequisites/i686-w64-mingw32-static --with-mpc=/c/mingw530/prerequisites/i686-w64-mingw32-static --with-isl=/c/mingw530/prerequisites/i686-w64-mingw32-static --with-pkgversion='i686-posix-dwarf-rev0, Built by MinGW-W64 project' --with-bugurl=http://sourceforge.net/projects/mingw-w64 CFLAGS='-O2 -pipe -I/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32/opt/include -I/c/mingw530/prerequisites/i686-zlib-static/include -I/c/mingw530/prerequisites/i686-w64-mingw32-static/include' CXXFLAGS='-O2 -pipe -I/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32/opt/include -I/c/mingw530/prerequisites/i686-zlib-static/include -I/c/mingw530/prerequisites/i686-w64-mingw32-static/include' CPPFLAGS= LDFLAGS='-pipe -L/c/mingw530/i686-530-posix-dwarf-rt_v4-rev0/mingw32/opt/lib -L/c/mingw530/prerequisites/i686-zlib-static/lib -L/c/mingw530/prerequisites/i686-w64-mingw32-static/lib -Wl,--large-address-aware'
Thread model: posix
gcc version 5.3.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project)