Cgo: sorry, unimplemented: 64-bit mode not compiled in

Question

I'm currently trying to add some C code to my Go project. nothing fancy

/*
#include <stdio.h>
void test() {
    printf("hooola")
}
*/

import (
    "C"
)

func MessageBox() {
    C.test()
}

However this will return

cc1.exe: sorry, unimplemented: 64-bit mode not compiled in

I checked my g++ and gcc compilers and everything seems fine, g++ -v returns this

C:\Users\ragga>g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=C:/Program\ Files/mingw-w64/x86_64-6.2.0-posix-seh-rt_v5-rev1/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/6.2.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-6.2.0/configure --host=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --prefix=/mingw64 --with-sysroot=/c/mingw620/x86_64-620-posix-seh-rt_v5-rev1/mingw64 --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 --enable-libstdcxx-filesystem-ts=yes --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=nocona --with-tune=core2 --with-libiconv --with-system-zlib --with-gmp=/c/mingw620/prerequisites/x86_64-w64-mingw32-static --with-mpfr=/c/mingw620/prerequisites/x86_64-w64-mingw32-static --with-mpc=/c/mingw620/prerequisites/x86_64-w64-mingw32-static --with-isl=/c/mingw620/prerequisites/x86_64-w64-mingw32-static --with-pkgversion='x86_64-posix-seh-rev1, Built by MinGW-W64 project' --with-bugurl=http://sourceforge.net/projects/mingw-w64 CFLAGS='-O2 -pipe -I/c/mingw620/x86_64-620-posix-seh-rt_v5-rev1/mingw64/opt/include -I/c/mingw620/prerequisites/x86_64-zlib-static/include -I/c/mingw620/prerequisites/x86_64-w64-mingw32-static/include' CXXFLAGS='-O2 -pipe -I/c/mingw620/x86_64-620-posix-seh-rt_v5-rev1/mingw64/opt/include -I/c/mingw620/prerequisites/x86_64-zlib-static/include -I/c/mingw620/prerequisites/x86_64-w64-mingw32-static/include' CPPFLAGS= LDFLAGS='-pipe -L/c/mingw620/x86_64-620-posix-seh-rt_v5-rev1/mingw64/opt/lib -L/c/mingw620/prerequisites/x86_64-zlib-static/lib -L/c/mingw620/prerequisites/x86_64-w64-mingw32-static/lib '
Thread model: posix
gcc version 6.2.0 (x86_64-posix-seh-rev1, Built by MinGW-W64 project)

While gcc --version returns this

g:\Workspace\Go\src\github.com\raggaer\snak>gcc --version
gcc (GCC) 4.8.1
Copyright (C) 2013 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.

Both installed using mingw64bits so I am not sure where my problem is coming from?