rust: Use awk instead of recent xargs

`awk` is already required by the kernel build, and the `xargs` feature
used in current Rust detection is not present in all `xargs` (notably,
toybox based xargs, used in the Android kernel build).

Signed-off-by: Matthew Maurer <mmaurer@google.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Link: https://lore.kernel.org/r/20230928205045.2375899-1-mmaurer@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

diff --git a/rust/Makefile b/rust/Makefile
index 87958e864be02508a01085a3929901eb49b1c565..c4e583e9e4438c4607bc5031ca3fbbacb63f1c7a 100644 (file)
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -364,9 +364,7 @@ $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE
 quiet_cmd_exports = EXPORTS $@
       cmd_exports = \
        $(NM) -p --defined-only $< \
-               | grep -E ' (T|R|D) ' | cut -d ' ' -f 3 \
-               | xargs -Isymbol \
-               echo 'EXPORT_SYMBOL_RUST_GPL(symbol);' > $@
+               | awk '/ (T|R|D) / {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@
 
 $(obj)/exports_core_generated.h: $(obj)/core.o FORCE
        $(call if_changed,exports)