panic at buing for arch linux x86_84:

[kipade]

I wanna to use libxml in a projects using xml, but got a building issue after add libxml, so, I download the source code and build by hands, got the same issue:
RUST_BACKTRACE=1 cargo build Compiling libxml v0.3.6 (/mnt/Data/GPLSRCS/Rust/rust-libxml) error: failed to run custom build command for libxml v0.3.6 (/mnt/Data/GPLSRCS/Rust/rust-libxml)`
note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.

Caused by:
process didn't exit successfully: /mnt/Data/GPLSRCS/Rust/rust-libxml/target/debug/build/libxml-b1c7df5fc9cd044e/build-script-build (exit status: 101)
--- stdout
cargo::rustc-check-cfg=cfg(libxml_older_than_2_12)
cargo:rerun-if-env-changed=LIBXML_2.0_NO_PKG_CONFIG
cargo:rerun-if-env-changed=PKG_CONFIG_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG
cargo:rerun-if-env-changed=PKG_CONFIG
cargo:rerun-if-env-changed=LIBXML_2.0_STATIC
cargo:rerun-if-env-changed=LIBXML_2.0_DYNAMIC
cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
cargo:rerun-if-env-changed=PKG_CONFIG_PATH
cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
cargo:rerun-if-env-changed=SYSROOT
cargo:rerun-if-env-changed=LIBXML_2.0_STATIC
cargo:rerun-if-env-changed=LIBXML_2.0_DYNAMIC
cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
cargo:rustc-link-search=native=/usr/lib
cargo:rustc-link-lib=xml2
cargo:rerun-if-env-changed=PKG_CONFIG_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG
cargo:rerun-if-env-changed=PKG_CONFIG
cargo:rerun-if-env-changed=LIBXML_2.0_STATIC
cargo:rerun-if-env-changed=LIBXML_2.0_DYNAMIC
cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
cargo:rerun-if-env-changed=PKG_CONFIG_PATH
cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
cargo:rerun-if-env-changed=TARGET
cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS_x86_64-unknown-linux-gnu
cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS_x86_64_unknown_linux_gnu
cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS
cargo:rerun-if-changed=src/wrapper.h

--- stderr
warning: ISO C99 requires whitespace after the macro name [-Wc99-extensions]
/usr/include/bits/floatn.h:97:9: error: __float128 is not supported on this target
/usr/include/libxml2/libxml/nanoftp.h:13:4: warning: "libxml/nanoftp.h is deprecated" [-W#warnings]
/usr/include/libxml2/libxml/SAX.h:15:4: warning: "libxml/SAX.h is deprecated" [-W#warnings]
/usr/include/libxml2/libxml/xmlunicode.h:12:4: warning: "libxml/xmlunicode.h is deprecated" [-W#warnings]

thread 'main' panicked at /home/kezhh/.cargo/registry/src/mirrors.ustc.edu.cn-04b7754156161b43/bindgen-0.72.0/lib.rs:917:13:
assertion left == right failed: "x86_64-unknown-linux-gnu" "x86_64-unknown-linux-gnu"
left: 4
right: 8
stack backtrace:
0: __rustc::rust_begin_unwind
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/panicking.rs:697:5
1: core::panicking::panic_fmt
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:75:14
2: core::panicking::assert_failed_inner
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:428:23
3: core::panicking::assert_failed
at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:388:5
4: bindgen::Bindings::generate
5: bindgen::Builder::generate
6: build_script_build::generate_bindings
7: build_script_build::main
8: core::ops::function::FnOnce::call_once
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.
Im a newbie for rust, so, how to fix it? my os version: x86_64 GNU/Linux archlinux with kernel 6.15 rustc --version --verbose:rustc 1.88.0 (6b00bc388 2025-06-23)
binary: rustc
commit-hash: 6b00bc3880198600130e1cf62b8f8a93494488cc
commit-date: 2025-06-23
host: x86_64-unknown-linux-gnu
release: 1.88.0
LLVM version: 20.1.5`

thanks

[jcamiel]

Hi,

Have you installed clang dependency on your Arch Linux ($ pacman -S clang)? https://github.com/KWARC/rust-libxml/blob/master/README.md#linuxdebian

[kipade]

yes, I do have clang installed:

clang version 20.1.8
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin