How to build rustc fully static with the llvm stack

[vernal adder]

Hi, how can I build rust fully static from source with full llvm stack, ie libc++, uniwnd and compiler rt

currently I'm trying this bootstrap.toml

with no success

change-id = 147888
[llvm]
use-libcxx = true
download-ci-llvm = false
targets = "AArch64;ARM;RISCV;WebAssembly;X86"
experimental-targets = "Xtensa"
cflags = "-fuse-ld=lld -std=c23 -fPIC -nostdinc++ -isystem /home/mccakit/dev/libcxx/native/include/c++/v1"
cxxflags = "-fuse-ld=lld -std=c++26 -fPIC -nostdinc++ -isystem /home/mccakit/dev/libcxx/native/include/c++/v1"
ldflags = "-fuse-ld=lld -rtlib=compiler-rt -nostdlib++ /home/mccakit/dev/libcxx/native/lib/libc++.a /home/mccakit/dev/libcxx/native/lib/libc++abi.a /home/mccakit/dev/libcxx/native/lib/libunwind.a"
[rust]
codegen-tests = false
[target.x86_64-unknown-linux-gnu]
cc = "/home/mccakit/dev/llvm/bin/clang"
cxx = "/home/mccakit/dev/llvm/bin/clang++"
ar = "/home/mccakit/dev/llvm/bin/llvm-ar"
linker = "/home/mccakit/dev/llvm/bin/clang"
ranlib = "/home/mccakit/dev/llvm/bin/llvm-ranlib"
llvm-libunwind = 'in-tree'
[build]
cargo-native-static = true

I also export these flags before running./x build

export RUSTFLAGS="-C link-arg=-fuse-ld=lld -C link-arg=-rtlib=compiler-rt -C link-arg=-nostdlib++ -C link-arg=/home/mccakit/dev/libcxx/native/lib/libc++.a -C link-arg=/home/mccakit/dev/libcxx/native/lib/libc++abi.a -C link-arg=/home/mccakit/dev/libcxx/native/lib/libunwind.a"

[surreal sundial]

Not an answer, but #957720175619215380 may be able to help with that

[restive niche]

we dynamically link librustc_driver.so, I don't know if you are going to have success here.

or at least, you can't just make all the C code statically linked in order to get a statically linked compiler

@surreal sundial @vernal adder Sadly I believe this requires patching of various parts of the source, especially bootstrap, based on https://github.com/rust-lang/rust/pull/148657

@misty apex may know better

[vernal adder]

I statically link llvm with -fPIC problem solved

[vernal adder]

you are right glibc be damned

[misty apex]

Be aware that a fully statically linked (as in also statically linking libc) rustc can't load proc macros.

For statically linking LLVM and libstdc++ (not libc++) you can use llvm.link-shared = false + llvm.static-libstdcpp = true.

[misty apex]

This because proc macros are dynamic libraries themself and you can't load dynamic libraries when statically linking libc. Musl will refuse immediately, while glibc will pull in the host libc.so and may crash due to conflicts.

[vernal adder]

thanks a lot, though I already succeeded in building with static libc++, unwind and compiler rt

I'm having trouble with stdlib right now