Re: [libgpiod][bug] building rust bindings requires clang headers

[Viresh Kumar <viresh.kumar@xxxxxxxxxx>]

On 09-06-23, 10:37, Kent Gibson wrote:
> 
> When trying to build the libgpiod rust bindings on my Debian bullseye VM I get:
> 
>    Compiling gpiosim-sys v0.1.0 (/home/dev/libgpiod/bindings/rust/gpiosim-sys)
> error: failed to run custom build command for `gpiosim-sys v0.1.0 (/home/dev/libgpiod/bindings/rust/gpiosim-sys)`
> 
> Caused by:
>   process didn't exit successfully: `/home/dev/libgpiod/bindings/rust/target/release/build/gpiosim-sys-dfa257ecee3f0e2e/build-script-build` (exit status: 101)
>   --- stdout
>   cargo:rerun-if-changed=../../../tests/gpiosim/gpiosim.h
> 
>   --- stderr
>   ../../../tests/gpiosim/gpiosim.h:7:10: fatal error: 'stdbool.h' file not found
>   thread 'main' panicked at 'Unable to generate bindings: ClangDiagnostic("../../../tests/gpiosim/gpiosim.h:7:10: fatal error: 'stdbool.h' file not found\n")', gpiosim-sys/build.rs:27:10
>   note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
> 
> The source of the error appears to be bindgen using libclang to parse
> the gpiosim header, and that failing if the requisite headers are not
> installed.
> 
> If I install them:
> 
> apt install libclang-common-11-dev
> 
> the build passes.
> 
> Can a dependency be added to the autotools configuration to check for
> the availability of those headers if building the rust bindings?

I am not very experienced with autotools, but won't something like this help ?

AC_CHECK_HEADERS([stdbool.h], [], [HEADER_NOT_FOUND_LIB([stdbool.h])])

> I would add it myself, but I'm not sure how - or if there is some better
> solution.
> The configure.ac already has a AC_HEADER_STDBOOL, but that checks for
> the gcc headers, not clang.

-- 
viresh