diff options
| author | Nathan Chancellor <[email protected]> | 2023-08-16 10:35:43 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <[email protected]> | 2023-08-31 00:18:37 -0700 |
| commit | 89775a27ff6d0396b44de0d6f44dcbc25221fdda (patch) | |
| tree | 13525be468708d3925503cb135221c3a7e21372f | |
| parent | 94f00388c2a4623700f030e90161744f4bdb8225 (diff) | |
lib/Kconfig.debug: Restrict DEBUG_INFO_SPLIT for RISC-V
When building for ARCH=riscv using LLVM < 14, there is an error with
CONFIG_DEBUG_INFO_SPLIT=y:
error: A dwo section may not contain relocations
This was worked around in LLVM 15 by disallowing '-gsplit-dwarf' with
'-mrelax' (the default), so CONFIG_DEBUG_INFO_SPLIT is not selectable
with newer versions of LLVM:
$ clang --target=riscv64-linux-gnu -gsplit-dwarf -c -o /dev/null -x c /dev/null
clang: error: -gsplit-dwarf is unsupported with RISC-V linker relaxation (-mrelax)
GCC silently had a similar issue that was resolved with GCC 12.x.
Restrict CONFIG_DEBUG_INFO_SPLIT for RISC-V when using LLVM or GCC <
12.x to avoid these known issues.
Link: https://github.com/ClangBuiltLinux/linux/issues/1914
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99090
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Nathan Chancellor <[email protected]>
Reviewed-by: Fangrui Song <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>
| -rw-r--r-- | lib/Kconfig.debug | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 39ffd218e960..7bad297b48fb 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -355,6 +355,11 @@ endchoice # "Compressed Debug information" config DEBUG_INFO_SPLIT bool "Produce split debuginfo in .dwo files" depends on $(cc-option,-gsplit-dwarf) + # RISC-V linker relaxation + -gsplit-dwarf has issues with LLVM and GCC + # prior to 12.x: + # https://github.com/llvm/llvm-project/issues/56642 + # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99090 + depends on !RISCV || GCC_VERSION >= 120000 help Generate debug info into separate .dwo files. This significantly reduces the build directory size for builds with DEBUG_INFO, |