Is it possible to build rustc and cargo for target?

[tekjar]

I tried using rustup to be able to directly compile on target board and it didn't work. Is it possible to build rustc and cargo using meta-rust?

[cardoe]

In theory yes, in practice I'm not sure if anyone has actually tested that.

[tekjar]

I'll test that. All I've to do is include rustc and cargo to image bb file right?

[cardoe]

Should be

[cardoe]

@kteza1 I'm assuming this has not worked for you? I just did bitbake rust-llvm and it failed to build for me.

[tekjar]

@cardoe Oops sorry for not getting back. I tried this some time back and it failed I think. I'll report back if I try this again.

[codyps]

I've tried to do this too with the experiment in merging the rust-llvm build into rust. IIRC, it failed there too due to llvm not recognizing the target it was being built for. llvm's build likely needs to be passed an llvm-flavor target instead of a OE target.

[cardoe]

So in my branch to build rust-llvm with cmake I've managed to get it compiled for the target. I haven't tried to build rust with it yet. But figured I'd provide an update.

[cardoe]

While #105 fixes rust-llvm it does not fix rust which still fails with the following:

-isystem/var/build/build/tmp/sysroots/x86_64-linux/usr/include -O2 -pipe -D_GLIBCXX_USE_CXX11_ABI=0  --sysroot=/var/build/build/tmp/sysroots/qemux86-64  -I /var/build/build/tmp/sysroots/x86_64-linux/usr/include -I /var/build/build/tmp/work/core2-64-poky-linux/rust/1.10.0-r0/rustc-1.10.0/src/rustllvm/include /var/build/build/tmp/work/core2-64-poky-linux/rust/1.10.0-r0/rustc-1.10.0/src/rustllvm/RustWrapper.cpp
In file included from /var/build/build/tmp/sysroots/x86_64-linux/usr/include/llvm/ADT/Hashing.h:48:0,
                 from /var/build/build/tmp/sysroots/x86_64-linux/usr/include/llvm/ADT/ArrayRef.h:13,
                 from /var/build/build/tmp/sysroots/x86_64-linux/usr/include/llvm/IR/IRBuilder.h:18,
                 from /var/build/build/tmp/work/core2-64-poky-linux/rust/1.10.0-r0/rustc-1.10.0/src/rustllvm/rustllvm.h:11,
                 from /var/build/build/tmp/work/core2-64-poky-linux/rust/1.10.0-r0/rustc-1.10.0/src/rustllvm/ExecutionEngineWrapper.cpp:11:
/var/build/build/tmp/sysroots/x86_64-linux/usr/include/llvm/Support/DataTypes.h:35:17: fatal error: cmath: No such file or directory
 #include <cmath>

[cardoe]

Guessing we're missing libstdc++-dev in DEPEND but adding that doesn't work. Unfortunately I don't have the error message anymore but it says something about gcc-runtime RPROVIDES libstdc++ and it can't be directly depended on. I'm guessing I just have something wrong. If someone that's a bit more knowledgable about Yocto has some ideas I bet we can fix it.

[srwalter]

If this is a build failure, then you'd need to DEPEND on gcc-runtime, rather RDEPEND, right?