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Kbuild fixes for v6.1
- Fix CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y compile error for
the combination of Clang >= 14 and GAS <= 2.35.
- Drop vmlinux.bz2 from the rpm package as it just annoyingly increased
the package size.
- Fix modpost error under build environments using musl.
- Make *.ll files keep value names for easier debugging
- Fix single directory build
- Prevent RISC-V from selecting the broken DWARF5 support when Clang
and GAS are used together.
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Merge tag 'kbuild-fixes-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- Fix CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y compile error for the
combination of Clang >= 14 and GAS <= 2.35.
- Drop vmlinux.bz2 from the rpm package as it just annoyingly increased
the package size.
- Fix modpost error under build environments using musl.
- Make *.ll files keep value names for easier debugging
- Fix single directory build
- Prevent RISC-V from selecting the broken DWARF5 support when Clang
and GAS are used together.
* tag 'kbuild-fixes-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5
kbuild: fix single directory build
kbuild: add -fno-discard-value-names to cmd_cc_ll_c
scripts/clang-tools: Convert clang-tidy args to list
modpost: put modpost options before argument
kbuild: Stop including vmlinux.bz2 in the rpm's
Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
Kconfig.debug: simplify the dependency of DEBUG_INFO_DWARF4/5
This commit is contained in:
Linus Torvalds
commit
2df76606db
2
Makefile
2
Makefile
@ -1979,6 +1979,8 @@ endif
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single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
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KBUILD_MODULES := 1
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endif
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# Preset locale variables to speed up the build process. Limit locale
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@ -231,6 +231,11 @@ config DEBUG_INFO
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in the "Debug information" choice below, indicating that debug
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information will be generated for build targets.
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# Clang is known to generate .{s,u}leb128 with symbol deltas with DWARF5, which
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# some targets may not support: https://sourceware.org/bugzilla/show_bug.cgi?id=27215
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config AS_HAS_NON_CONST_LEB128
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def_bool $(as-instr,.uleb128 .Lexpr_end4 - .Lexpr_start3\n.Lexpr_start3:\n.Lexpr_end4:)
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choice
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prompt "Debug information"
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depends on DEBUG_KERNEL
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@ -253,6 +258,7 @@ config DEBUG_INFO_NONE
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config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
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bool "Rely on the toolchain's implicit default DWARF version"
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select DEBUG_INFO
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depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
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help
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The implicit default version of DWARF debug info produced by a
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toolchain changes over time.
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@ -264,7 +270,7 @@ config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
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config DEBUG_INFO_DWARF4
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bool "Generate DWARF Version 4 debuginfo"
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select DEBUG_INFO
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depends on !CC_IS_CLANG || (CC_IS_CLANG && (AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)))
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depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)
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help
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Generate DWARF v4 debug info. This requires gcc 4.5+, binutils 2.35.2
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if using clang without clang's integrated assembler, and gdb 7.0+.
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@ -276,7 +282,7 @@ config DEBUG_INFO_DWARF4
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config DEBUG_INFO_DWARF5
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bool "Generate DWARF Version 5 debuginfo"
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select DEBUG_INFO
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depends on !CC_IS_CLANG || (CC_IS_CLANG && (AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)))
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depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
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help
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Generate DWARF v5 debug info. Requires binutils 2.35.2, gcc 5.0+ (gcc
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5.0+ accepts the -gdwarf-5 flag but only had partial support for some
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@ -140,7 +140,7 @@ $(obj)/%.symtypes : $(src)/%.c FORCE
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# LLVM assembly
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# Generate .ll files from .c
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quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $<
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$(obj)/%.ll: $(src)/%.c FORCE
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$(call if_changed_dep,cc_ll_c)
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@ -119,7 +119,7 @@ quiet_cmd_modpost = MODPOST $@
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echo >&2 "WARNING: $(missing-input) is missing."; \
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echo >&2 " Modules may not have dependencies or modversions."; \
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echo >&2 " You may get many unresolved symbol warnings.";) \
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sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) $(vmlinux.o-if-present) -T -
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sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) -T - $(vmlinux.o-if-present)
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targets += $(output-symdump)
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$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(moudle.symvers-if-present) $(MODPOST) FORCE
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@ -45,13 +45,14 @@ def init(l, a):
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def run_analysis(entry):
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# Disable all checks, then re-enable the ones we want
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checks = "-checks=-*,"
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checks = []
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checks.append("-checks=-*")
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if args.type == "clang-tidy":
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checks += "linuxkernel-*"
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checks.append("linuxkernel-*")
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else:
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checks += "clang-analyzer-*"
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checks += ",-clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling"
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p = subprocess.run(["clang-tidy", "-p", args.path, checks, entry["file"]],
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checks.append("clang-analyzer-*")
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checks.append("-clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling")
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p = subprocess.run(["clang-tidy", "-p", args.path, ",".join(checks), entry["file"]],
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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cwd=entry["directory"])
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@ -97,8 +97,6 @@ $M $MAKE %{?_smp_mflags} INSTALL_MOD_PATH=%{buildroot} modules_install
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$MAKE %{?_smp_mflags} INSTALL_HDR_PATH=%{buildroot}/usr headers_install
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cp System.map %{buildroot}/boot/System.map-$KERNELRELEASE
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cp .config %{buildroot}/boot/config-$KERNELRELEASE
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bzip2 -9 --keep vmlinux
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mv vmlinux.bz2 %{buildroot}/boot/vmlinux-$KERNELRELEASE.bz2
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$S$M rm -f %{buildroot}/lib/modules/$KERNELRELEASE/build
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$S$M rm -f %{buildroot}/lib/modules/$KERNELRELEASE/source
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$S$M mkdir -p %{buildroot}/usr/src/kernels/$KERNELRELEASE
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