meson: correct bindgen_clang_argments

Follow the changes in Clang search paths and specify sysroot via the
TOOLCHAIN_OPTIONS, otherwise clang will fail to find system headers when
executed by bindgen.

For SDK packages TOOLCHAIN_OPTIONS don't contain full sysroot path, so
specify the correct directory explicitly.

(From OE-Core rev: a647a0ff4c4eb7a7c1f6ec84a574f7d7796b6178)

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-recipe/meson.bbclass

@@ -62,6 +62,14 @@ def rust_tool(d, target_var):
     cmd = [rustc, "--target", d.getVar(target_var)] + d.getVar("RUSTFLAGS").split()
     return "rust = %s" % repr(cmd)
 
+def bindgen_args(d):
+    args = '${HOST_CC_ARCH}${TOOLCHAIN_OPTIONS} --target=${TARGET_SYS}'
+    # For SDK packages TOOLCHAIN_OPTIONS don't contain full sysroot path
+    if bb.data.inherits_class("nativesdk", d):
+        args += ' --sysroot=${STAGING_DIR_HOST}${SDKPATHNATIVE}${prefix_nativesdk}'
+    items = d.expand(args).split()
+    return repr(items[0] if len(items) == 1 else items)
+
 addtask write_config before do_configure
 do_write_config[vardeps] += "CC CXX AR NM STRIP READELF OBJCOPY CFLAGS CXXFLAGS LDFLAGS RUSTC RUSTFLAGS EXEWRAPPER_ENABLED"
 do_write_config() {
@@ -93,7 +101,7 @@ cpp_link_args = ${@meson_array('LDFLAGS', d)}
 [properties]
 needs_exe_wrapper = true
 sys_root = '${STAGING_DIR_HOST}'
-bindgen_clang_arguments = ['-target', '${@d.getVar('RUST_HOST_SYS')}', '-I${STAGING_INCDIR}']
+bindgen_clang_arguments = ${@bindgen_args(d)}
 
 [host_machine]
 system = '${@meson_operating_system('HOST_OS', d)}'