On Fri, Sep 13, 2024 at 8:06 PM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote: > > 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@xxxxxxxxxx> Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
