[PATCH 04/18] rust: kbuild: define `procmacro-name` function

[Miguel Ojeda <ojeda@kernel.org>]

Since we are adding one more proc macro crate (`zerocopy-derive`),
we are refactoring their handling.

Thus define a `procmacro-name` function and use it to fill the existing
variables' values.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/Makefile | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/rust/Makefile b/rust/Makefile
index 2b4a3983bb1e..8dfccf7399d9 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -47,10 +47,12 @@ endif
 # Avoids running `$(RUSTC)` when it may not be available.
 ifdef CONFIG_RUST
 
-libmacros_name := $(shell MAKEFLAGS= $(RUSTC) --print file-names --crate-name macros --crate-type proc-macro - </dev/null)
+procmacro-name = $(shell MAKEFLAGS= $(RUSTC) --print file-names --crate-name $(1) --crate-type proc-macro - </dev/null)
+
+libmacros_name := $(call procmacro-name,macros)
 libmacros_extension := $(patsubst libmacros.%,%,$(libmacros_name))
 
-libpin_init_internal_name := $(shell MAKEFLAGS= $(RUSTC) --print file-names --crate-name pin_init_internal --crate-type proc-macro - </dev/null)
+libpin_init_internal_name := $(call procmacro-name,pin_init_internal)
 
 always-$(CONFIG_RUST) += $(libmacros_name) $(libpin_init_internal_name)
 
-- 
2.54.0