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bindgen-cli: set CLANG_PATH in native wrapper to native clang

Message ID 20260630190004.1083997-1-yogesh.tyagi@intel.com
State New
Headers show
Series bindgen-cli: set CLANG_PATH in native wrapper to native clang | expand

Commit Message

Yogesh Tyagi June 30, 2026, 7 p.m. UTC 
From: Yogesh Tyagi <yogesh.tyagi@intel.com>

bindgen uses the clang-sys crate to locate a 'clang' executable for
querying default include paths. clang-sys's search order is CLANG_PATH,
then libclang's directory, then 'llvm-config --bindir', then PATH.

When clang is used as the toolchain, the crossscripts llvm-config wrapper
honours YOCTO_ALTERNATE_EXE_PATH and reports the target sysroot bindir.
clang-sys's 'llvm-config --bindir' step then resolves to a target clang
that cannot execute on the build host, so native bindgen fails with:

  could not run executable .../recipe-sysroot/usr/bin/clang-NN:
  No such file or directory (os error 2)

This is hit, for example, when building mesa with the rusticl/opencl
PACKAGECONFIG, whose do_compile runs the native bindgen against
rusticl_mesa_bindings.h.

Set CLANG_PATH to the native clang in the bindgen wrapper so clang-sys
uses the runnable host binary first, short-circuiting the llvm-config
lookup. The native wrapper already exports LIBCLANG_PATH the same way.

Signed-off-by: Yogesh Tyagi <yogesh.tyagi@intel.com>
---
 .../bindgen-cli/bindgen-cli_0.72.1.bb               | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/meta/recipes-devtools/bindgen-cli/bindgen-cli_0.72.1.bb b/meta/recipes-devtools/bindgen-cli/bindgen-cli_0.72.1.bb
index 72dadfe52f..1e2b901aab 100644
--- a/meta/recipes-devtools/bindgen-cli/bindgen-cli_0.72.1.bb
+++ b/meta/recipes-devtools/bindgen-cli/bindgen-cli_0.72.1.bb
@@ -11,8 +11,19 @@  SRCREV = "d874de8d646d9b8a3e7ba2db2bcd52f2fba8f1f5"
 
 require ${BPN}-crates.inc
 
+# bindgen uses the clang-sys crate to locate a 'clang' executable for querying
+# default include paths. clang-sys's search order is: CLANG_PATH, libclang's dir,
+# 'llvm-config --bindir', then PATH. When clang is the toolchain, the crossscripts
+# llvm-config wrapper honours YOCTO_ALTERNATE_EXE_PATH and reports the target
+# sysroot bindir, so clang-sys's 'llvm-config --bindir' step resolves to a target
+# clang that cannot run on the build host (native bindgen then fails with
+# "could not run executable .../clang-NN: No such file or directory", e.g. when
+# building mesa with the rusticl/opencl PACKAGECONFIG). Set CLANG_PATH to the
+# native clang so the runnable host binary is used first.
 do_install:append:class-native() {
-	create_wrapper ${D}/${bindir}/bindgen LIBCLANG_PATH="${STAGING_LIBDIR_NATIVE}"
+	create_wrapper ${D}/${bindir}/bindgen \
+		LIBCLANG_PATH="${STAGING_LIBDIR_NATIVE}" \
+		CLANG_PATH="${STAGING_BINDIR_NATIVE}/clang"
 }
 
 BBCLASSEXTEND = "native nativesdk"