rustPlatform.bindgenHook: init

doc/languages-frameworks/rust.section.md

@@ -464,6 +464,8 @@ you of the correct hash.
  be disabled by setting `dontUseCargoParallelTests`.
 * `cargoInstallHook`: install binaries and static/shared libraries
  that were built using `cargoBuildHook`.
+* `bindgenHook`: for crates which use `bindgen` as a build dependency, lets
+ `bindgen` find `libclang` and `libclang` find the libraries in `buildInputs`.
 
 ### Examples {#examples}
 

pkgs/build-support/rust/hooks/default.nix

@@ -1,6 +1,7 @@
 { buildPackages
 , callPackage
 , cargo
+, clang
 , diffutils
 , lib
 , makeSetupHook
@@ -92,4 +93,13 @@ in {
  rustBuildPlatform rustTargetPlatform rustTargetPlatformSpec;
  };
  } ./maturin-build-hook.sh) {};
+
+ bindgenHook = callPackage ({}: makeSetupHook {
+ name = "rust-bindgen-hook";
+ substitutions = {
+ libclang = clang.cc.lib;
+ inherit clang;
+ };
+ }
+ ./rust-bindgen-hook.sh) {};
 }

pkgs/build-support/rust/hooks/rust-bindgen-hook.sh

@@ -0,0 +1,13 @@
+# populates LIBCLANG_PATH and BINDGEN_EXTRA_CLANG_ARGS for rust projects that
+# depend on the bindgen crate
+
+# if you modify this, you probably also need to modify the wrapper for the cli
+# of bindgen in pkgs/development/tools/rust/bindgen/wrapper.sh
+
+populateBindgenEnv () {
+ export LIBCLANG_PATH=@libclang@/lib
+ BINDGEN_EXTRA_CLANG_ARGS="$(< @clang@/nix-support/cc-cflags) $(< @clang@/nix-support/libc-cflags) $(< @clang@/nix-support/libcxx-cxxflags) $NIX_CFLAGS_COMPILE"
+ export BINDGEN_EXTRA_CLANG_ARGS
+}
+
+postHook="${postHook:-}"$'\n'"populateBindgenEnv"$'\n'

pkgs/development/compilers/rust/make-rust-platform.nix

@@ -31,5 +31,5 @@ rec {
  # Hooks
  inherit (callPackage ../../../build-support/rust/hooks {
  inherit stdenv cargo rustc;
- }) cargoBuildHook cargoCheckHook cargoInstallHook cargoSetupHook maturinBuildHook;
+ }) cargoBuildHook cargoCheckHook cargoInstallHook cargoSetupHook maturinBuildHook bindgenHook;
 }

pkgs/development/tools/rust/bindgen/default.nix

@@ -34,7 +34,9 @@ let
  touch $out
  '';
  };
- } ''
+ }
+ # if you modify the logic to find the right clang flags, also modify rustPlatform.bindgenHook
+ ''
  mkdir -p $out/bin
  export cincludes="$(< ${clang}/nix-support/cc-cflags) $(< ${clang}/nix-support/libc-cflags)"
  export cxxincludes="$(< ${clang}/nix-support/libcxx-cxxflags)"