add cross/README.md

yamt · Jun 25, 2023 · 154e7f9 · 154e7f9
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+This directory contains a few scripts to cross build toywasm
+on ubuntu-focal/amd64.
+
+I usually use this with a docker image built from
+https://github.com/yamt/garbage/tree/master/myubuntu.
+
+Also used by toywasm github CI jobs.
+
+Expected usage:
+```
+./cross/setup-focal-proposed.sh
+export ARCH=arm64
+./cross/cross-setup.sh
+./cross/setup-alternatives.sh
+
+rm -rf build.cross.${ARCH}
+./cross/cross-cmake-configure.sh
+
+cd build.cross.${ARCH}
+make
+```