kbuild: rust: use `-Zdwarf-version` to support DWARFv5

Rust 1.64.0 introduced (unstable) support for the `-Zdwarf-version`
flag, which allows to select DWARFv5, thus use it.

Link: https://github.com/rust-lang/rust/issues/103057
Link: https://github.com/rust-lang/rust/pull/98350
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20240217002602.57270-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

diff --git a/scripts/Makefile.debug b/scripts/Makefile.debug
index 059ff38fe0cb31e8646d5b9228fe89219d881bf8..693452bc826aa697a2392370450083d12bcdc3f9 100644 (file)
--- a/scripts/Makefile.debug
+++ b/scripts/Makefile.debug
@@ -17,6 +17,12 @@ endif
 DEBUG_CFLAGS   += $(debug-flags-y)
 KBUILD_AFLAGS  += $(debug-flags-y)
 
+ifdef CONFIG_DEBUG_INFO_DWARF4
+DEBUG_RUSTFLAGS        += -Zdwarf-version=4
+else ifdef CONFIG_DEBUG_INFO_DWARF5
+DEBUG_RUSTFLAGS        += -Zdwarf-version=5
+endif
+
 ifdef CONFIG_DEBUG_INFO_REDUCED
 DEBUG_CFLAGS   += -fno-var-tracking
 DEBUG_RUSTFLAGS        += -Cdebuginfo=1