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How to cross build initial toolchain
Example with sparc64
1/ install a cross toolchain
pkg install sparc64-gcc6
2/ cross build world
make CROSS_TOOLCHAIN=sparc64-gcc6 TARGET=sparc64 TARGET_ARCH=sparc64 buildworld
3/ install the world in a sysroot
make CROSS_TOOLCHAIN=sparc64-gcc6 TARGET=sparc64 TARGET_ARCH=sparc64 installworld DESTDIR=/sysroots/sparc64
4/ build the required port
$ cd base/binutils
make CROSS_TOOLCHAIN=sparc64-gcc6 CROSS_SYSROOT=/sysroots/sparc64 package
$ cd base/gcc6
make CROSS_TOOLCHAIN=sparc64-gcc6 CROSS_SYSROOT=/sysroots/sparc64 package
The packages are in base/gcc6/work/pkg/*.txz and base/binutils/work/pkg/*.txz
To add a plist for a new binutils target
$ cd base/binutils
make CROSS_TOOLCHAIN=sparc64-gcc6 CROSS_SYSROOT=/sysroots/sparc64 makeplist > pkg-plist
edit the pkg-plist and remove everything which base does not provide via the
elftoolchain
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