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authorNathan Chancellor <nathan@kernel.org>2023-08-16 20:35:43 +0300
committerPalmer Dabbelt <palmer@rivosinc.com>2023-08-31 10:18:37 +0300
commit89775a27ff6d0396b44de0d6f44dcbc25221fdda (patch)
tree13525be468708d3925503cb135221c3a7e21372f /lib
parent94f00388c2a4623700f030e90161744f4bdb8225 (diff)
downloadlinux-89775a27ff6d0396b44de0d6f44dcbc25221fdda.tar.xz
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 <lkp@intel.com> Closes: https://lore.kernel.org/all/202308090204.9yZffBWo-lkp@intel.com/ Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Fangrui Song <maskray@google.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lore.kernel.org/r/20230816-riscv-debug_info_split-v1-1-d1019d6ccc11@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug5
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,