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Message-Id: <20221002181107.51286-3-masahiroy@kernel.org> Date: Mon, 3 Oct 2022 03:11:06 +0900 From: Masahiro Yamada <masahiroy@...nel.org> To: linux-kbuild@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Nick Desaulniers <ndesaulniers@...gle.com>, Nathan Chancellor <nathan@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>, Tom Rix <trix@...hat.com>, llvm@...ts.linux.dev Subject: [PATCH 2/3] Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT passes the -g option to the command line. The actual DWARF version is up to the toolchain. The combination of GCC and GAS works fine, and Clang with the integrated assembler is good too. The combination of Clang and GAS is a bit tricky, but at least, the default -g flag worked until LLVM 14 was released because Clang <=13 defaults to DWARF v4. Clang 14 switched to DWARF v5 by default. Now, CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT has the same issue as addressed by commit 98cd6f521f10 ("Kconfig: allow explicit opt in to DWARF v5"). CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y for Clang >= 14 and GAS < 2.35 produces a ton of errors like follows: /tmp/main-c2741c.s: Assembler messages: /tmp/main-c2741c.s:109: Error: junk at end of line, first unrecognized character is `"' /tmp/main-c2741c.s:109: Error: file number less than one Add 'depends on' to check toolchains. Signed-off-by: Masahiro Yamada <masahiroy@...nel.org> --- lib/Kconfig.debug | 1 + 1 file changed, 1 insertion(+) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index f4b2165f24db..cc90414d492e 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -253,6 +253,7 @@ config DEBUG_INFO_NONE config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT bool "Rely on the toolchain's implicit default DWARF version" select DEBUG_INFO + depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502) help The implicit default version of DWARF debug info produced by a toolchain changes over time. -- 2.34.1
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