Cross compiling from Linux to Windows with disabled default features for std is giving error

[Selyatin]

I'm getting this error when trying to build with xargo with default std features off, I can compile just fine using normal cargo.

user@localhost:~/Documents/project> xargo build --release --target x86_64-pc-windows-gnu
error: couldn't copy /home/user/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/crt2.o to /home/user/.xargo/lib/rustlib/x86_64-pc-windows-gnu/lib/crt2.o
caused by: No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` for a backtrace

[RalfJung]

The error is caused here:

xargo/src/sysroot.rs

Line 67 in 23c6fd2

for file in ["rsbegin.o", "rsend.o", "crt2.o", "dllcrt2.o"].iter() {

You need to install the x86_64-pc-windows-gnu target, I think, to get those files? I am not an expert in Windows matters but I assume that xargo code was added for a reason.^^

I can compile just fine using normal cargo.

How are you building the standard library using normal cargo?

[Selyatin]

I'm not building the standard library using normal cargo and I've x86_64-pc-windows-gnu installed, otherwise I wouldn't be able to compile it using standard cargo.

[RalfJung]

I'm not building the standard library using normal cargo

Then what do you mean by "I can compile just fine using normal cargo"? I thought you meant building the standard library, now I am not sure.

I've x86_64-pc-windows-gnu installed

Hm, can you check if the file "crt2.o" exists anywhere in /home/user/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu? It used to be at /home/user/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/crt2.o but maybe it moved...

[RalfJung]

Looks like these days the files reside at

~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/self-contained/crt2.o
~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/self-contained/dllcrt2.o
~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/rsbegin.o
~/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/rsend.o

[RalfJung]

FWIW, the PR that broke this is probably rust-lang/rust#72999.

[Selyatin]

The pull request works. Thanks for your help.