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UPSTREAM: Makefile: use -gdwarf-{4|5} for assembler for DEBUG_INFO_DWARF{4|5}

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This is _not_ an upstream commit and just for 5.15.y only. It is based
on upstream
commit 32ef9e5054ec ("Makefile.debug: re-enable debug info for .S files").

When the user has chosen not to use their compiler's implicit default
DWARF version (which changes over time) via selecting
- CONFIG_DEBUG_INFO_DWARF4 or
- CONFIG_DEBUG_INFO_DWARF5
we need to tell the compiler this for Asm sources as well as C sources.
(We use the compiler to drive assembler jobs in kbuild, since most asm
needs to be preprocessed first).  Otherwise, we will get object files
built from Asm sources with the compiler's implicit default DWARF
version.

For example, selecting CONFIG_DEBUG_INFO_DWARF4 would produce a DWARFv5
vmlinux, since it was a mix of DWARFv4 object files from C sources and
DWARFv5 object files from Asm sources when using Clang as the assembler
(ex. `make LLVM=1`).

Fixes: 0ee2f0567a ("Makefile.debug: re-enable debug info for .S files")
Reported-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Change-Id: Ieafdf50b5d18596cd23de3e5f5f112b57de55c27
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[nd: cherry-picking from stable linux-5.15.y]
(cherry picked from commit 10a72c677b)
Bug: 271216981
This commit is contained in:
Nick Desaulniers
2023-03-15 14:40:59 -07:00
committed by Treehugger Robot
parent 1fd3cdb1c2
commit ee002ea6ad
1 changed files with 1 additions and 0 deletions
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Makefile
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@@ -903,6 +903,7 @@ ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
KBUILD_AFLAGS += -gdwarf-$(dwarf-version-y)
endif
ifdef CONFIG_DEBUG_INFO_REDUCED