0730422bce
Because the `macros` crate exposes procedural macros, it must be
compiled as a dynamic library (so it can be loaded by the compiler at
compile-time).
Before this change the resulting artifact was always named
`libmacros.so`, which works on hosts where this matches the naming
convention for dynamic libraries. However the proper name on macOS would
be `libmacros.dylib`.
This turns out to matter even when the dependency is passed with a path
(`--extern macros=path/to/libmacros.so` rather than `--extern macros`)
because rustc uses the file name to infer the type of the library (see
link). This is because there's no way to specify both the path to and
the type of the external library via CLI flags. The compiler could
speculatively parse the file to determine its type, but it does not do
so today.
This means that libraries that match neither rustc's naming convention
for static libraries nor the platform's naming convention for dynamic
libraries are *rejected*.
The only solution I've found is to follow the host platform's naming
convention. This patch does that by querying the compiler to determine
the appropriate name for the artifact. This allows the kernel to build
with CONFIG_RUST=y on macOS.
Link: d829780/compiler/rustc_metadata/src/locator.rs (L728-L752)
Tested-by: Daniel Gomez <da.gomez@samsung.com>
Co-developed-by: Fiona Behrens <me@kloenk.dev>
Signed-off-by: Fiona Behrens <me@kloenk.dev>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
Link: https://lore.kernel.org/r/20241216-b4-dylib-host-macos-v7-1-cfc507681447@gmail.com
[ Added `MAKEFLAGS=`s to avoid jobserver warnings. Removed space.
Reworded title. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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# SPDX-License-Identifier: GPL-2.0-only
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#
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# NOTE! Don't add files that are generated in specific
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# subdirectories here. Add them in the ".gitignore" file
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# in that subdirectory instead.
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#
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# NOTE! Please use 'git ls-files -i -c --exclude-per-directory=.gitignore'
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# command after changing this file, to see if there are
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# any tracked files which get ignored after the change.
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#
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# Normal rules (sorted alphabetically)
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#
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.*
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*.a
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*.asn1.[ch]
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*.bin
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*.bz2
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*.c.[012]*.*
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*.dt.yaml
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*.dtb
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*.dtbo
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*.dtb.S
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*.dtbo.S
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*.dwo
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*.dylib
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*.elf
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*.gcno
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*.gcda
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*.gz
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*.i
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*.ko
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*.lex.c
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*.ll
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*.lst
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*.lz4
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*.lzma
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*.lzo
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*.mod
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*.mod.c
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*.o
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*.o.*
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*.patch
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*.rmeta
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*.rpm
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*.rsi
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*.s
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*.so
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*.so.dbg
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*.su
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*.symtypes
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*.tab.[ch]
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*.tar
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*.xz
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*.zst
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Module.symvers
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dtbs-list
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modules.order
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#
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# Top-level generic files
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#
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/linux
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/modules-only.symvers
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/vmlinux
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/vmlinux.32
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/vmlinux.map
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/vmlinux.symvers
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/vmlinux-gdb.py
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/vmlinuz
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/System.map
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/Module.markers
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/modules.builtin
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/modules.builtin.modinfo
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/modules.builtin.ranges
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/modules.nsdeps
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#
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# RPM spec file (make rpm-pkg)
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#
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/rpmbuild/
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#
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# Debian directory (make deb-pkg)
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#
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/debian/
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#
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# Snap directory (make snap-pkg)
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#
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/snap/
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#
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# tar directory (make tar*-pkg)
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#
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/tar-install/
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#
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# pacman files (make pacman-pkg)
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#
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/PKGBUILD
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/pacman/
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#
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# We don't want to ignore the following even if they are dot-files
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#
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!.clang-format
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!.clippy.toml
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!.cocciconfig
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!.editorconfig
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!.get_maintainer.ignore
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!.gitattributes
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!.gitignore
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!.kunitconfig
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!.mailmap
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!.rustfmt.toml
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#
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# Generated include files
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#
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/include/config/
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/include/generated/
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/arch/*/include/generated/
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# stgit generated dirs
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patches-*
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# quilt's files
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patches
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series
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# ctags files
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tags
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!tags/
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TAGS
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# cscope files
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cscope.*
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ncscope.*
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# gnu global files
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GPATH
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GRTAGS
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GSYMS
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GTAGS
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# id-utils files
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ID
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*~
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\#*#
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#
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# Leavings from module signing
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#
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extra_certificates
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signing_key.pem
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signing_key.priv
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signing_key.x509
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x509.genkey
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# Kconfig presets
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/all.config
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/alldef.config
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/allmod.config
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/allno.config
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/allrandom.config
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/allyes.config
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# Kconfig savedefconfig output
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/defconfig
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# Kdevelop4
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*.kdev4
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# Clang's compilation database file
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/compile_commands.json
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# Documentation toolchain
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sphinx_*/
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# Rust analyzer configuration
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/rust-project.json
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