Building MinGW Cross-Compilation Toolchain using CrossDev

This is mainly a note to myself. Maybe it’s useful for you too.

Actually building cross-compiler toolchains using crossdev is easy, but there are some pitfalls.

Remove any compiler environment variables before building, or the build will fail
For building MinGW toolchains the openmp useflag must not be set
If you have built already a toolchain partially with wrong settings, remove it completely before trying it again

Simple Build Instructions for building mingw32 and gdb:

# become root
su
# clear env (clearing CXX should not be necessary, but it doesn't hurt)
export CC=
export CXX=
export CFLAGS=
export CXXFLAGS=
export LDFLAGS=
# build using crossdev
crossdev --ex-gdb -t i686-pc-mingw32`

For 64bit toolchain use x86_64-w64-mingw32 instead of i686-pc-mingw32.

Uninstall: crossdev -C i686-pc-mingw32

See https://wiki.gentoo.org/wiki/Mingw for more information.

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