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wangjiezhe/gentoo-crossdev.md

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Created March 13, 2025 12:58
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Gentoo cross compilation instructions (crossdev -> stage3)
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Cross instructions

Set up the toolchain

$ crossdev riscv64-unknown-linux-gnu

Avoid dependency hell and populate the ROOT

Emerge sys-libs/glibc (no, @system / @world won't make it realise it can/should do this, don't ask why, I don't know):

$ riscv64-unknown-linux-gnu-emerge -v1 sys-libs/glibc
$ riscv64-unknown-linux-gnu-emerge -v1 @system

Profile setup

Choosing profile

Run: PORTAGE_CONFIGROOT=/usr/riscv64-unknown-linux-gnu eselect profile list

Pick a nice looking one, like default/linux/riscv/20.0/rv64gc/lp64.

$ PORTAGE_CONFIGROOT=/usr/riscv64-unknown-linux-gnu eselect profile set default/linux/riscv/20.0/rv64gc/lp64

Remove -pam nonsense

Edit /usr/riscv64-unknown-linux-gnu/etc/portage/make.conf to remove USE=-pam because it'll conflict with sys-apps/util-linux being the default su provider:

$ sed -i -e "s:-pam::" /usr/riscv64-unknown-linux-gnu/etc/portage/make.conf

Avoid circular deps

$ USE="-filecaps" riscv64-unknown-linux-gnu-emerge -v1 @system
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wangjiezhe commented Mar 14, 2025

对于 binfmt，还要参考 https://wiki.gentoo.org/wiki/Crossdev/Testing_packages_via_qemu 设置 LD_PREFIX 和 LD_LIBRARY_PATH。

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wangjiezhe commented Mar 14, 2025

crossdev 建立的文件夹默认使用 split-usr 结构，要转换成 merge-usr 结构：

mkdir /usr/mips64el-unknown-linux-gnuabi64/bin
merge-usr --root /usr/mips64el-unknown-linux-gnuabi64

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wangjiezhe commented Mar 14, 2025

要交叉编译 mesa，需要补充软链接：

ln -s /usr/mips64el-unknown-linux-gnuabi64/usr/lib/llvm/19/bin/mips64el-unknown-linux-gnuabi64-llvm-config \
  /usr/lib/llvm/19/bin/mips64el-unknown-linux-gnuabi64-llvm-config

并使用 binfmt。

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