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kbuild: remove unnecessary export of RUST_LIB_SRC

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If RUST_LIB_SRC is defined in the top-level Makefile (via an environment
variable or command line), it is already exported.

The only situation where it is defined but not exported is when the
top-level Makefile is wrapped by another Makefile (e.g., GNUmakefile).
I cannot think of any other use cases.

I know some people use this tip to define custom variables. However,
even in that case, you can export it directly in the wrapper Makefile.

Example GNUmakefile:

    export RUST_LIB_SRC = /path/to/your/sysroot/lib/rustlib/src/rust/library
    include Makefile

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
This commit is contained in:
Masahiro Yamada 2024-09-14 03:06:20 +09:00
parent cc6d281fcc
commit fc1c79be45
1 changed files with 0 additions and 4 deletions
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4
Makefile
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@ -578,10 +578,6 @@ else
RUSTC_OR_CLIPPY = $(RUSTC)
endif
ifdef RUST_LIB_SRC
export RUST_LIB_SRC
endif
# Allows the usage of unstable features in stable compilers.
export RUSTC_BOOTSTRAP := 1