Unable to find libclang when is installed and exists

[latot]

Hi all, I'm new in pgrx thing, I was following the instructions for the hello world main project, but when was time to compile I failed, can't found libclang, but is installed and available:

   Compiling pgrx-pg-sys v0.14.3
error: failed to run custom build command for `pgrx-pg-sys v0.14.3`

Caused by:
  process didn't exit successfully: `/home/pipe/Documentos/test_pgrx/my_extension/target/debug/build/pgrx-pg-sys-d4edf94760dacee3/build-script-bindgen` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=PGRX_BUILD_VERBOSE
  cargo:rerun-if-env-changed=PGRX_PG_SYS_GENERATE_BINDINGS_FOR_RELEASE
  cargo:rerun-if-env-changed=PGRX_PG_CONFIG_PATH
  cargo:rerun-if-env-changed=PGRX_PG_CONFIG_AS_ENV
  cargo:rerun-if-env-changed=LLVM_CONFIG_PATH
  cargo:rerun-if-env-changed=LIBCLANG_PATH
  cargo:rerun-if-env-changed=LIBCLANG_STATIC_PATH
  cargo:rerun-if-env-changed=BINDGEN_EXTRA_CLANG_ARGS
  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=PGRX_PG_SYS_GENERATE_BINDINGS_FOR_RELEASE
  cargo:rerun-if-changed=include
  cargo:rerun-if-changed=pgrx-cshim.c
  cargo:rerun-if-changed=/home/pipe/.pgrx/config.toml
  cargo:rerun-if-env-changed=PGRX_TARGET_INFO_PATH_PG13_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PGRX_TARGET_INFO_PATH_PG13
  cargo:rerun-if-env-changed=PGRX_INCLUDEDIR_SERVER_PG13_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PGRX_INCLUDEDIR_SERVER_PG13
  cargo:rerun-if-env-changed=PGRX_INCLUDEDIR_SERVER_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PGRX_INCLUDEDIR_SERVER
  cargo:rerun-if-env-changed=PGRX_BINDGEN_NO_DETECT_INCLUDES_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PGRX_BINDGEN_NO_DETECT_INCLUDES

  --- stderr
  build_paths=BuildPaths { manifest_dir: "/home/pipe/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/pgrx-pg-sys-0.14.3", out_dir: "/home/pipe/Documentos/test_pgrx/my_extension/target/debug/build/pgrx-pg-sys-174df2eea8a085d1/out", src_dir: "/home/pipe/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/pgrx-pg-sys-0.14.3/src/include", shim_src: "/home/pipe/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/pgrx-pg-sys-0.14.3/pgrx-cshim.c", shim_dst: "/home/pipe/Documentos/test_pgrx/my_extension/target/debug/build/pgrx-pg-sys-174df2eea8a085d1/out/pgrx-cshim.c" }
  Generating bindings for pg13
  pg_config --configure CLANG = None
  pg_target_includes = ["/home/pipe/.pgrx/13.21/pgrx-install/include/postgresql/server/"]

  thread '<unnamed>' panicked at /home/pipe/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/bindgen-0.71.1/lib.rs:604:27:
  Unable to find libclang: "couldn't find any valid shared libraries matching: ['libclang.so', 'libclang-*.so', 'libclang.so.*', 'libclang-*.so.*'], set the `LIBCLANG_PATH` environment variable to a path where one of these files can be found (invalid: [])"
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

  thread 'main' panicked at /home/pipe/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/pgrx-bindgen-0.14.3/src/build.rs:271:41:
  thread panicked while generating bindings: Any { .. }

I have installed PG 16.9 and 17.5.

I use Gentoo x64, a very unusual system, here is where are the libs:

ldconfig -p | grep libclang
	libclang.so.19.1 (libc6,x86-64) => /usr/lib/llvm/19/lib64/libclang.so.19.1
	libclang.so.19.1 (libc6) => /usr/lib/llvm/19/lib/libclang.so.19.1
	libclang.so.18.1 (libc6,x86-64) => /usr/lib/llvm/18/lib64/libclang.so.18.1
	libclang.so.18.1 (libc6) => /usr/lib/llvm/18/lib/libclang.so.18.1
	libclang.so (libc6,x86-64) => /usr/lib/llvm/19/lib64/libclang.so
	libclang.so (libc6,x86-64) => /usr/lib/llvm/18/lib64/libclang.so
	libclang.so (libc6) => /usr/lib/llvm/19/lib/libclang.so
	libclang.so (libc6) => /usr/lib/llvm/18/lib/libclang.so
	libclang-cpp.so.19.1 (libc6,x86-64) => /usr/lib/llvm/19/lib64/libclang-cpp.so.19.1
	libclang-cpp.so.19.1 (libc6) => /usr/lib/llvm/19/lib/libclang-cpp.so.19.1
	libclang-cpp.so.18.1 (libc6,x86-64) => /usr/lib/llvm/18/lib64/libclang-cpp.so.18.1
	libclang-cpp.so.18.1 (libc6) => /usr/lib/llvm/18/lib/libclang-cpp.so.18.1
	libclang-cpp.so (libc6,x86-64) => /usr/lib/llvm/19/lib64/libclang-cpp.so
	libclang-cpp.so (libc6,x86-64) => /usr/lib/llvm/18/lib64/libclang-cpp.so
	libclang-cpp.so (libc6) => /usr/lib/llvm/19/lib/libclang-cpp.so
	libclang-cpp.so (libc6) => /usr/lib/llvm/18/lib/libclang-cpp.so

Thx!

[usamoi]

  Unable to find libclang: "couldn't find any valid shared libraries matching: ['libclang.so', 'libclang-*.so', 'libclang.so.*', 'libclang-*.so.*'], set the `LIBCLANG_PATH` environment variable to a path where one of these files can be found (invalid: [])"

Have you tried set export LIBCLANG_PATH=/usr/lib/llvm/19/lib64/ in your profile?

[latot]

Hi, tweaking clang's path to do it works.

Still weird to this do not found the lib when exists.

[usamoi]

https://github.com/KyleMayes/clang-sys/blob/master/build/common.rs#L160

It's not in search path. In cases where multiple versions of Clang are installed on the machine, manually setting the LIBCLANG_PATH is strongly recommended regardless.

[latot]

Hi, right, what I would expect as a message is "more than one clang found, choose one using LIBCLANG_PATH" or something like that.