Firefox on Linux/riscv64

This step is out of date since I have merged all patches to trunk. Please read How to build Firefox for Linux/riscv64 on Ubuntu 22.10 + Unmatched instead.

Although I don't land all patches to mozilla-central yet, source code is https://github.com/makotokato/gecko-dev/tree/riscv64.

To build this, you have to build nodejs v16.0 since Firefox build sytem requires it. So I recommend that you setup cross compile environemnt instead of building on Unmatched board host.

Also, this is .mozconfig sample.

mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/objdir
mk_add_options AUTOCLOBBER=1
ac_add_options NODEJS=/home/makoto/node-v16/bin/node

ac_add_options --enable-application=browser
ac_add_options --disable-debug
ac_add_options --enable-optimize

export CC=gcc
export CXX=g++

If using corss compile,

mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/objdir
mk_add_options AUTOCLOBBER=1

ac_add_options --enable-application=browser
ac_add_options --disable-debug
ac_add_options --enable-optimize

ac_add_options --target=riscv64
export CC=riscv64-linux-gnu-gcc
export CXX=riscv64-linux-gnu-g++
export HOST_CC=gcc
export HOST_CXX=g++