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| author | Masahiro Yamada <masahiroy@kernel.org> | 2021-05-12 15:52:01 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2021-05-24 12:06:51 +0900 |
| commit | 0d989ac2c90b5f51fe12102d3cddf54b959f2014 (patch) | |
| tree | 2288248dd0b997c298aa8bf7659b14e423cb9241 /scripts/Makefile.modfinal | |
| parent | 1bb0b18a06dceee1fdc32161a72e28eab6f011c4 (diff) | |
| download | lwn-0d989ac2c90b5f51fe12102d3cddf54b959f2014.tar.gz lwn-0d989ac2c90b5f51fe12102d3cddf54b959f2014.zip | |
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>
Diffstat (limited to 'scripts/Makefile.modfinal')
| -rw-r--r-- | scripts/Makefile.modfinal | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal index dd87cea9fba7..bdee3babc5cf 100644 --- a/scripts/Makefile.modfinal +++ b/scripts/Makefile.modfinal @@ -39,12 +39,10 @@ prelink-ext := .lto # so let's now process the prelinked binary before we link the module. ifdef CONFIG_STACK_VALIDATION -ifneq ($(SKIP_STACK_VALIDATION),1) cmd_ld_ko_o += \ $(objtree)/tools/objtool/objtool $(objtool_args) \ $(@:.ko=$(prelink-ext).o); -endif # SKIP_STACK_VALIDATION endif # CONFIG_STACK_VALIDATION endif # CONFIG_LTO_CLANG |