Error with bindgen 0.52

[gwenn]

Bindgen 0.51 is fine.
But with bindgen 0.52:

• On Travis CI / Linux:
  https://travis-ci.org/jgallagher/rusqlite/jobs/624712017?utm_medium=notification&utm_source=github_status

error: linking with `cc` failed: exit code: 1
...
 = note: /home/travis/build/jgallagher/rusqlite/target/debug/deps/libbindgen-8d08512025d35d16.rlib(bindgen-8d08512025d35d16.bindgen.863a57vr-cgu.7.rcgu.o): In function `bindgen::clang::EvalResult::as_int::h7466386cd7d4bef8':
/home/travis/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bindgen-0.52.0/src/clang.rs:2013: undefined reference to `clang_EvalResult_isUnsignedInt'
/home/travis/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bindgen-0.52.0/src/clang.rs:2022: undefined reference to `clang_EvalResult_getAsLongLong'
/home/travis/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bindgen-0.52.0/src/clang.rs:2014: undefined reference to `clang_EvalResult_getAsUnsigned'
/home/travis/build/jgallagher/rusqlite/target/debug/deps/libbindgen-8d08512025d35d16.rlib(bindgen-8d08512025d35d16.bindgen.863a57vr-cgu.7.rcgu.o): In function `bindgen::clang::TargetInfo::new::hcf80461fab469455':
/home/travis/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bindgen-0.52.0/src/clang.rs:2071: undefined reference to `clang_getTranslationUnitTargetInfo'
/home/travis/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bindgen-0.52.0/src/clang.rs:2072: undefined reference to `clang_TargetInfo_getTriple'
/home/travis/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bindgen-0.52.0/src/clang.rs:2073: undefined reference to `clang_TargetInfo_getPointerWidth'
/home/travis/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/bindgen-0.52.0/src/clang.rs:2074: undefined reference to `clang_TargetInfo_dispose'
collect2: error: ld returned 1 exit status

• On AppVeyor / Windows:
  https://ci.appveyor.com/project/jgallagher/rusqlite/builds/29526117

error: linking with `gcc` failed: exit code: 1
...
  = note: ld: cannot find -lclang.dll

Locally, on a Linux VM (Archlinux), build succeeds.

[emilio]

Are you using default-features = false? I think you need to change to features = ["dynamic"] if so so that clang is runtime-detected. Otherwise it needs a relatively-new libclang version.

This is fallout from #1649.

[gwenn]

Indeed, features = ["runtime"] fixes all problems.
Thanks.