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kbuild: remove libelf checks from top Makefile
I do not see a good reason why only the libelf development package must
be so carefully checked.
Kbuild generally does not check host tools or libraries.
For example, x86_64 defconfig fails to build with no libssl development
package installed.
scripts/extract-cert.c:21:10: fatal error: openssl/bio.h: No such file or directory
21 | #include <openssl/bio.h>
| ^~~~~~~~~~~~~~~
To solve the build error, you need to install libssl-dev or openssl-devel
package, depending on your distribution.
'apt-file search', 'dnf provides', etc. is your frined to find a proper
package to install.
This commit removes all the libelf checks from the top Makefile.
If libelf is missing, objtool will fail to build in a similar pattern:
.../linux/tools/objtool/include/objtool/elf.h:10:10: fatal error: gelf.h: No such file or directory
10 | #include <gelf.h>
You need to install libelf-dev, libelf-devel, or elfutils-libelf-devel
to proceed.
Another remarkable change is, CONFIG_STACK_VALIDATION (without
CONFIG_UNWINDER_ORC) previously continued to build with a warning,
but now it will treat missing libelf as an error.
This is just a one-time installation, so it should not hurt to break
a build and make a user install the package.
BTW, the traditional way to handle such checks is autotool, but according
to [1], I do not expect the kernel build would have similar scripting
like './configure' does.
[1]: https://lore.kernel.org/lkml/CA+55aFzr2HTZVOuzpHYDwmtRJLsVzE-yqg2DHpHi_9ePsYp5ug@mail.gmail.com/
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
This commit is contained in:
Masahiro Yamada
parent
1bb0b18a06
commit
0d989ac2c9
78
Makefile
78
Makefile
@ -1081,41 +1081,6 @@ export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
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MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
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export MODLIB
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HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
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has_libelf = $(call try-run,\
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echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
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ifdef CONFIG_STACK_VALIDATION
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ifeq ($(has_libelf),1)
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objtool_target := tools/objtool FORCE
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else
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SKIP_STACK_VALIDATION := 1
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export SKIP_STACK_VALIDATION
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endif
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endif
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PHONY += resolve_btfids_clean
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resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
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# tools/bpf/resolve_btfids directory might not exist
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# in output directory, skip its clean in that case
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resolve_btfids_clean:
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ifneq ($(wildcard $(resolve_btfids_O)),)
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$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
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endif
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ifdef CONFIG_BPF
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ifdef CONFIG_DEBUG_INFO_BTF
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ifeq ($(has_libelf),1)
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resolve_btfids_target := tools/bpf/resolve_btfids FORCE
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else
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ERROR_RESOLVE_BTFIDS := 1
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endif
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endif # CONFIG_DEBUG_INFO_BTF
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endif # CONFIG_BPF
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PHONY += prepare0
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export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
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@ -1227,7 +1192,7 @@ prepare0: archprepare
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$(Q)$(MAKE) $(build)=.
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# All the preparing..
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prepare: prepare0 prepare-objtool prepare-resolve_btfids
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prepare: prepare0
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PHONY += remove-stale-files
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remove-stale-files:
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@ -1244,26 +1209,6 @@ uapi-asm-generic:
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$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
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generic=include/uapi/asm-generic
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PHONY += prepare-objtool prepare-resolve_btfids
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prepare-objtool: $(objtool_target)
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ifeq ($(SKIP_STACK_VALIDATION),1)
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ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
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@echo "error: Cannot generate __mcount_loc for CONFIG_DYNAMIC_FTRACE=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
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@false
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endif
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ifdef CONFIG_UNWINDER_ORC
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@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
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@false
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else
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@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
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endif
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endif
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prepare-resolve_btfids: $(resolve_btfids_target)
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ifeq ($(ERROR_RESOLVE_BTFIDS),1)
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@echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
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@false
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endif
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# Generate some files
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# ---------------------------------------------------------------------------
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@ -1354,6 +1299,27 @@ scripts_unifdef: scripts_basic
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# ---------------------------------------------------------------------------
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# Tools
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ifdef CONFIG_STACK_VALIDATION
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prepare: tools/objtool
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endif
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ifdef CONFIG_BPF
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ifdef CONFIG_DEBUG_INFO_BTF
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prepare: tools/bpf/resolve_btfids
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endif
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endif
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PHONY += resolve_btfids_clean
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resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
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# tools/bpf/resolve_btfids directory might not exist
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# in output directory, skip its clean in that case
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resolve_btfids_clean:
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ifneq ($(wildcard $(resolve_btfids_O)),)
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$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
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endif
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# Clear a bunch of variables before executing the submake
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ifeq ($(quiet),silent_)
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tools_silent=s
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@ -219,7 +219,6 @@ endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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ifdef CONFIG_STACK_VALIDATION
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ifndef CONFIG_LTO_CLANG
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ifneq ($(SKIP_STACK_VALIDATION),1)
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__objtool_obj := $(objtree)/tools/objtool/objtool
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@ -233,7 +232,6 @@ objtool_obj = $(if $(patsubst y%,, \
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$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
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$(__objtool_obj))
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endif # SKIP_STACK_VALIDATION
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endif # CONFIG_LTO_CLANG
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endif # CONFIG_STACK_VALIDATION
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@ -39,12 +39,10 @@ prelink-ext := .lto
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# so let's now process the prelinked binary before we link the module.
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ifdef CONFIG_STACK_VALIDATION
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ifneq ($(SKIP_STACK_VALIDATION),1)
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cmd_ld_ko_o += \
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$(objtree)/tools/objtool/objtool $(objtool_args) \
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$(@:.ko=$(prelink-ext).o);
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endif # SKIP_STACK_VALIDATION
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endif # CONFIG_STACK_VALIDATION
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endif # CONFIG_LTO_CLANG
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