CODEWITHSUNDEEP
crustcross-compilingrust-cargo
Netzdoktor
Netzdoktor

Reputation: 526

Bindgen does not cross-compile to ARM due to stdint.h

I have a C library that I wrap into a Rust crate using bindgen. My build.rs is straightforward and very similar to this. The C library is using pthreads internally.

In principle, my cross-compilation works for pure Rust targets, but in combination with the bindgen C-library it stops working. Compiling for my host platform (x86_64) works fine, but when I try to cross-compile for arm-unknown-linux-gnueabihf (Raspberry Pi Zero)*, I get the following errors:

/home/andreas/rpi/rootfs/usr/include/stdint.h:43:9: error: unknown type name '__int_least8_t'
/home/andreas/rpi/rootfs/usr/include/stdint.h:44:9: error: unknown type name '__int_least16_t'
/home/andreas/rpi/rootfs/usr/include/stdint.h:45:9: error: unknown type name '__int_least32_t'
/home/andreas/rpi/rootfs/usr/include/stdint.h:46:9: error: unknown type name '__int_least64_t'
/home/andreas/rpi/rootfs/usr/include/stdint.h:49:9: error: unknown type name '__uint_least8_t'
/home/andreas/rpi/rootfs/usr/include/stdint.h:50:9: error: unknown type name '__uint_least16_t'
/home/andreas/rpi/rootfs/usr/include/stdint.h:51:9: error: unknown type name '__uint_least32_t'
/home/andreas/rpi/rootfs/usr/include/stdint.h:52:9: error: unknown type name '__uint_least64_t'
/home/andreas/rpi/rootfs/usr/include/stdio.h:39:10: fatal error: 'bits/types/__fpos_t.h' file not found
/home/andreas/rpi/rootfs/usr/include/stdint.h:43:9: error: unknown type name '__int_least8_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdint.h:44:9: error: unknown type name '__int_least16_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdint.h:45:9: error: unknown type name '__int_least32_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdint.h:46:9: error: unknown type name '__int_least64_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdint.h:49:9: error: unknown type name '__uint_least8_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdint.h:50:9: error: unknown type name '__uint_least16_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdint.h:51:9: error: unknown type name '__uint_least32_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdint.h:52:9: error: unknown type name '__uint_least64_t', err: true
/home/andreas/rpi/rootfs/usr/include/stdio.h:39:10: fatal error: 'bits/types/__fpos_t.h' file not found, err: true
thread 'main' panicked at 'Unable to generate bindings: ()', src/libcore/result.rs:1188:5

I used it with the built-in tools of Rust and with the normal clang + gcc toolchain on my system and compiles fine natively. Now I switched to raspi-toolchain and set the CPATH to the header files I have downloaded from my Raspberry Pi Zero, but the problem persists (it only changes from errors based on pthread.h to stdint.h).

In build.rs, I first run cmake and then I do the following:

let dst = cmake::Config::new("../")
        //...
        .build();
println!("cargo:rustc-link-search=native={}", dst.display());

How can I proceed from here?

The same happens for the armv7 target.

Upvotes: 2

Views: 1719

Answers (2)

jrpear
jrpear

Reputation: 262

I encountered this too. I got bindgen to look in the right spot by adding:

.clang_arg("--target=arm-unknown-linux-gnueabihf")

to the bindgen builder.

Upvotes: 1

Netzdoktor
Netzdoktor

Reputation: 526

I had to add more headers from the Raspi part:

/usr/include
/usr/include/arm-linux-gnueabihf
/usr/include/arm-linux-gnueabihf/sys

Upvotes: 0

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