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kbuild: rust: use -Zdebuginfo-compression

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Rust 1.74.0 introduced (unstable) support for the
`-Zdebuginfo-compression` flag, thus use it.

Note that the releases built by the Rust project (i.e. the ones provided
by rustup) do not enable support for zstd in their bundled LLVM (yet,
at least), thus the Rust compiler will warn, but the build will proceed:

    warning: unknown debuginfo compression algorithm zstd - will fall
    back to uncompressed debuginfo

Link: https://github.com/rust-lang/rust/issues/120953
Link: https://github.com/rust-lang/rust/pull/115358
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20240217002622.57322-1-ojeda@kernel.org
[ Added note about zstd support in Rust-provided binaries. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Miguel Ojeda 2024-02-17 01:26:22 +01:00
parent b8b2096ab8
commit dbef1811c8
1 changed files with 2 additions and 0 deletions
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2
scripts/Makefile.debug
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@ -35,10 +35,12 @@ endif
ifdef CONFIG_DEBUG_INFO_COMPRESSED_ZLIB
DEBUG_CFLAGS += -gz=zlib
DEBUG_RUSTFLAGS += -Zdebuginfo-compression=zlib
KBUILD_AFLAGS += -gz=zlib
KBUILD_LDFLAGS += --compress-debug-sections=zlib
else ifdef CONFIG_DEBUG_INFO_COMPRESSED_ZSTD
DEBUG_CFLAGS += -gz=zstd
DEBUG_RUSTFLAGS += -Zdebuginfo-compression=zstd
KBUILD_AFLAGS += -gz=zstd
KBUILD_LDFLAGS += --compress-debug-sections=zstd
endif