When building something with Cargo, I have to set LIBCLANG_PATH=/usr/lib64/llvm/4/lib64, otherwise I get following error: # env RUST_BACKTRACE=1 cargo build Compiling libdrm-sys v0.1.0 (file:///.../libdrm-sys) error: failed to run custom build command for `libdrm-sys v0.1.0 (file:///.../libdrm-sys)` process didn't exit successfully: `/.../libdrm-sys/target/debug/build/libdrm-sys-4f67ae197979240b/build-script-build` (exit code: 101) --- stdout cargo:rustc-link-search=native=/usr/lib64 cargo:rustc-link-lib=drm --- stderr thread 'main' panicked at 'Unable to find libclang: "couldn\'t find any of \'libclang.so\', set the LIBCLANG_PATH environment variable to a path where one of these files can be found"', src/libcore/result.rs:868 stack backtrace: 1: 0x55bf46c9bddc - std::sys::imp::backtrace::tracing::imp::write::h59f11508bbbb14ed at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:42 2: 0x55bf46ca14fe - std::panicking::default_hook::{{closure}}::h6803a4f823630483 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panicking.rs:351 3: 0x55bf46ca1104 - std::panicking::default_hook::h34bd173121b68cc3 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panicking.rs:367 4: 0x55bf46ca193b - std::panicking::rust_panic_with_hook::h9dbf610601b6a7e6 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panicking.rs:555 5: 0x55bf46ca17d4 - std::panicking::begin_panic::hb6716f52468b0723 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panicking.rs:517 6: 0x55bf46ca16f9 - std::panicking::begin_panic_fmt::h26c3fb5a170461f1 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panicking.rs:501 7: 0x55bf46ca1687 - rust_begin_unwind at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panicking.rs:477 8: 0x55bf46cd80fd - core::panicking::panic_fmt::hf96d4d16395a9d71 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libcore/panicking.rs:69 9: 0x55bf4654308b - core::result::unwrap_failed::h2bcbc560df5472b0 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libcore/macros.rs:29 10: 0x55bf46502309 - <core::result::Result<T, E>>::expect::h1d8c08035c783d8c at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libcore/result.rs:769 11: 0x55bf464ef01f - <lazy_static::lazy::Lazy<T>>::get::{{closure}}::h9bce05532fdd5b94 at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.22.1/src/lib.rs:687 at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/lazy_static-0.2.6/src/lazy.rs:16 12: 0x55bf464dcd81 - std::sync::once::Once::call_once::{{closure}}::h7dce399882989d72 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/sync/once.rs:212 13: 0x55bf46c99842 - std::sync::once::Once::call_inner::h6ba4ba3d4919cf4a at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/sync/once.rs:288 14: 0x55bf464dccdf - std::sync::once::Once::call_once::h3a174e8e205cc1ab at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/sync/once.rs:212 15: 0x55bf4667f2a5 - <bindgen::ensure_libclang_is_loaded::LIBCLANG as core::ops::Deref>::deref::heac8c02d07ce7597 at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/lazy_static-0.2.6/src/lazy.rs:15 at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.22.1/src/lib.rs:687 at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.22.1/src/lib.rs:687 16: 0x55bf46628909 - bindgen::ensure_libclang_is_loaded::he8076042174ede6b at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.22.1/src/lib.rs:696 17: 0x55bf46628a71 - bindgen::Bindings::generate::ha6f17b254b3b00cb at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.22.1/src/lib.rs:715 18: 0x55bf4662807f - bindgen::Builder::generate::hbfc3f97238c377d6 at /.../.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.22.1/src/lib.rs:469 19: 0x55bf4646ff16 - build_script_build::main::h0a6b75938e89867a at /.../libdrm-sys/build.rs:24 20: 0x55bf46cab93a - __rust_maybe_catch_panic at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libpanic_unwind/lib.rs:98 21: 0x55bf46ca20a6 - std::rt::lang_start::h57d3f8e2f32e3c87 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panicking.rs:436 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/panic.rs:361 at /var/tmp/portage/dev-lang/rust-1.16.0/work/rustc-1.16.0-src/src/libstd/rt.rs:57 22: 0x55bf46470392 - main 23: 0x7f5b868bf26f - __libc_start_main 24: 0x55bf46450ea9 - _start 25: 0x0 - <unknown> This does not appear to be "normal" - i.e. I have not seen Rust users complain about this in general - thus I assume it is a Gentoo problem. I would assume that rustc should have the llvm and clang library paths in its regular search path, so that clang-sys (which is the one doing the actual loading, I think) can immediately find libclang.so. # emerge --info dev-util/cargo dev-lang/rust sys-devel/clang sys-devel/llvm Portage 2.3.5 (python 2.7.12-final-42, default/linux/amd64/13.0/desktop/plasma/systemd, gcc-5.4.0, glibc-2.24-r1, 4.10.8-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-4.10.8-gentoo-x86_64-AMD_A10-7800_Radeon_R7,_12_Compute_Cores_4C+8G-with-gentoo-2.3 KiB Mem: 14345612 total, 3348988 free KiB Swap: 0 total, 0 free Timestamp of repository gentoo: Sun, 09 Apr 2017 06:15:01 +0000 sh bash 4.4_p12 ld GNU ld (Gentoo 2.27 p1.0) 2.27 ccache version 3.3.4 [disabled] app-shells/bash: 4.4_p12::gentoo dev-java/java-config: 2.2.0-r3::gentoo dev-lang/perl: 5.24.1-r1::gentoo dev-lang/python: 2.7.13-r100::sage-on-gentoo, 3.4.6::gentoo, 3.5.3::gentoo dev-util/ccache: 3.3.4::gentoo dev-util/cmake: 3.7.2-r1::gentoo dev-util/pkgconfig: 0.29.2::gentoo sys-apps/baselayout: 2.3::gentoo sys-apps/sandbox: 2.10-r4::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69-r2::gentoo sys-devel/automake: 1.11.6-r2::gentoo, 1.12.6-r1::gentoo, 1.13.4-r1::gentoo, 1.15-r2::gentoo sys-devel/binutils: 2.27::gentoo sys-devel/gcc: 5.4.0-r3::gentoo sys-devel/gcc-config: 1.8-r1::gentoo sys-devel/libtool: 2.4.6-r4::gentoo sys-devel/make: 4.2.1::gentoo sys-kernel/linux-headers: 4.10::gentoo (virtual/os-headers) sys-libs/glibc: 2.24-r1::gentoo Repositories: gentoo location: /var/cache/portage/gentoo sync-type: rsync sync-uri: rsync://rsync.de.gentoo.org/gentoo-portage priority: -1000 flatpak-overlay location: /var/lib/layman/flatpak-overlay sync-type: laymansync sync-uri: git://github.com/fosero/flatpak-overlay.git masters: gentoo priority: 50 kde location: /var/lib/layman/kde sync-type: laymansync sync-uri: git://anongit.gentoo.org/proj/kde.git masters: gentoo priority: 50 sage-on-gentoo location: /var/lib/layman/sage-on-gentoo sync-type: laymansync sync-uri: git://github.com/cschwan/sage-on-gentoo.git masters: gentoo science priority: 50 science location: /var/lib/layman/science sync-type: laymansync sync-uri: git://anongit.gentoo.org/proj/sci.git masters: gentoo priority: 50 local location: /var/cache/portage/local masters: gentoo priority: 100 ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-pipe -O2 -march=bdver3" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/config /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php7.1/ext-active/ /etc/php/cgi-php7.1/ext-active/ /etc/php/cli-php7.1/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-pipe -O2 -march=bdver3" DISTDIR="/var/cache/portage/distfiles" EMERGE_DEFAULT_OPTS="--keep-going --nospinner --verbose-conflicts" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs buildsyspkg cgroup compressdebug config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync network-sandbox news parallel-fetch parallel-install preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://ftp.spline.inf.fu-berlin.de/mirrors/gentoo/ http://ftp-stud.hs-esslingen.de/pub/Mirrors/gentoo/ http://distfiles.gentoo.org" LANG="de_DE.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu" MAKEOPTS="-j3" PKGDIR="/var/cache/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/var/tmp" USE="X a52 aac aacplus aacs acl acpi alsa amd64 appindicator appstream archive audit avahi bash-completion bdplus berkdb bluetooth bluray branding bs2b bzip2 cairo caps cdda cddb cdio cdr celt chromaprint cjk clang cli colord colorio conntrack cracklib crypt cups cxx d3d9 dbus declarative dirac dri dts dvb dvd dvdr egl emboss encode exif fam fax ffmpeg fftw firefox fits flac fontconfig fortran fribidi gdbm geoclue geolocation gif git glamor gles gmp googledrive gpm gstreamer gtk gtk3 harfbuzz ibus iconv icu idn inotify introspection ipv6 jemalloc jpeg jpeg2k kde kipi kwallet ladspa latex lcms ldap libinput libnotify libproxy libsecret libsoxr lua_target_lua5-2 lv2 lz4 lzma lzo mad mercurial metis mjpeg mng modemmanager modplug modules mp3 mp4 mpeg mplayer mtp multilib mysql ncurses netlink networkmanager nls nptl ogg openal opencl opencv openexr opengl openmax openmp opus pam pango pcap pch pcre pcre2 pdf phonon plasma png policykit postscript ppds prison pulseaudio python qml qt3support qt4 qt5 raw readline rtmp samba scanner schroedinger sctp sdl seccomp semantic-desktop session sparse speech speex spell ssl startup-notification svg systemd tbb tcpd telepathy theora threads tiff timezone truetype tslib udev udisks unicode unwind upnp upnp-av upower usb v4l v4l2 vaapi vdpau vorbis vpx vulkan wavpack wayland webp widgets x264 x265 xattr xcb xcomposite xinerama xml xmp xrandr xscreensaver xv xvid xz zeroconf zlib" ABI_X86="64" ALSA_CARDS="hda-intel" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_EXPERIMENTAL_FEATURES="stage" CALLIGRA_FEATURES="words sheets karbon plan" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx fma3 fma4 mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 xop" ELIBC="glibc" ENLIGHTENMENT_MODULES="*" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="coreboot efi-64 pc" INPUT_DEVICES="joystick libinput" KERNEL="linux" L10N="de en en-GB ar fa tr ja ko zh zh-CN zh-TW" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="de en en_GB ar fa tr" LIRC_DEVICES="devinput" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-6" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_4 python3_5 pypy pypy3" RUBY_TARGETS="ruby21" USERLAND="GNU" VIDEO_CARDS="amdgpu" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CC, CPPFLAGS, CTARGET, CXX, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON ================================================================= Package Settings ================================================================= dev-util/cargo-0.17.0::gentoo was built with the following: USE="-debug -doc -libressl" ABI_X86="64" dev-lang/rust-1.16.0::gentoo was built with the following: USE="clang libcxx -debug -doc" ABI_X86="64" sys-devel/clang-4.0.0-r1::gentoo was built with the following: USE="default-compiler-rt default-libcxx doc static-analyzer xml -debug -multitarget -test" ABI_X86="32 64 -x32" LLVM_TARGETS="AMDGPU BPF NVPTX X86 -AArch64 -ARM -Hexagon -Lanai -MSP430 -Mips -PowerPC -RISCV -Sparc -SystemZ -XCore" PYTHON_TARGETS="python2_7" sys-devel/llvm-4.0.0-r1::gentoo was built with the following: USE="doc gold libffi ncurses -debug -libedit -test" ABI_X86="32 64 -x32" LLVM_TARGETS="AMDGPU BPF NVPTX X86 -AArch64 -ARM -Hexagon -Lanai -MSP430 -Mips -PowerPC -RISCV -Sparc -SystemZ -XCore"
P.S. The code can be found at: https://github.com/devurandom/libdrm-sys-rs
I suppose you've built rust after upgrading to slotted LLVM? i.e. you're not using rust that built against one of the early RCs?
(In reply to Michał Górny from comment #2) > I suppose you've built rust after upgrading to slotted LLVM? i.e. you're not > using rust that built against one of the early RCs? dev-lang/rust-1.16.0 was built after sys-devel/llvm-4.0.0, says genlop.
Since building Rust against system LLVM/clang is unsupported, I'll close this for now.
