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kbuild: dwarf: use AS_VERSION instead of test_dwarf5_support.sh

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The test code in scripts/test_dwarf5_support.sh is somewhat difficult
to understand, but after all, we want to check binutils >= 2.35.2

From the former discussion, the requirement for generating DWARF v5 from
C code is as follows:

 - gcc + gnu as          -> requires gcc 5.0+ (but 7.0+ for full support)
 - clang + gnu as        -> requires binutils 2.35.2+
 - clang + integrated as -> OK

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
This commit is contained in:
Masahiro Yamada 2021-03-16 01:12:57 +09:00
parent ba64beb174
commit 2e98815794
2 changed files with 1 additions and 10 deletions
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3
lib/Kconfig.debug
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@ -284,8 +284,7 @@ config DEBUG_INFO_DWARF4
config DEBUG_INFO_DWARF5
bool "Generate DWARF Version 5 debuginfo"
depends on GCC_VERSION >= 50000 || CC_IS_CLANG
depends on CC_IS_GCC || $(success,$(srctree)/scripts/test_dwarf5_support.sh $(CC) $(CLANG_FLAGS))
depends on GCC_VERSION >= 50000 || (CC_IS_CLANG && (AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)))
depends on !DEBUG_INFO_BTF
help
Generate DWARF v5 debug info. Requires binutils 2.35.2, gcc 5.0+ (gcc

8
scripts/test_dwarf5_support.sh
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@ -1,8 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# Test that the assembler doesn't need -Wa,-gdwarf-5 when presented with DWARF
# v5 input, such as `.file 0` and `md5 0x00`. Should be fixed in GNU binutils
# 2.35.2. https://sourceware.org/bugzilla/show_bug.cgi?id=25611
echo '.file 0 "filename" md5 0x7a0b65214090b6693bd1dc24dd248245' | \
$* -gdwarf-5 -Wno-unused-command-line-argument -c -x assembler -o /dev/null -