Can't navigate Linux kernel source code

Hello!

Here is the instruction for working with Linux kernel in CLion. And also take a look at these notes: https://twitter.com/andrewshcheglov/status/1364940835448578051.

I've tried all the steps described in that doc, but errors still remain. Maybe this google doc has some updates which haven't yet gone online? Haven't tried compilation database generator yet though.

I think there is a typo. Instead of bear make V=1 bzImage modules, it should be bear -- make V=1 bzImage modules.

When this command finished, I got the following error:

/home/vadim/projects/linux_2/tools/objtool/include/objtool/elf.h:10:10: fatal error: gelf.h: No such file or directory
   10 | #include <gelf.h>
      |          ^~~~~~~~
compilation terminated.
make[4]: *** [/home/vadim/projects/linux_2/tools/build/Makefile.build:98: /home/vadim/projects/linux_2/tools/objtool/arch/x86/special.o] Error 1
make[3]: *** [/home/vadim/projects/linux_2/tools/build/Makefile.build:140: arch/x86] Error 2
make[2]: *** [Makefile:66: /home/vadim/projects/linux_2/tools/objtool/objtool-in.o] Error 2
make[1]: *** [Makefile:73: objtool] Error 2
make: *** [Makefile:1440: tools/objtool] Error 2

Have you tried the suggestion about the generated headers (https://twitter.com/andrewshcheglov/status/1364940835448578051)?

Are you able to build the project in Terminal outside CLion?

I think OP's errors are irrelevant for me. Anyways, i've run what Andrey wrote, namely 'make include/generated/ arch/x86/include/generated/', but this command itself resulted in the same error:

  CALL    scripts/checksyscalls.sh
  DESCEND objtool
<stdin>:1:10: fatal error: libelf.h: No such file or directory
compilation terminated.
  INSTALL libsubcmd_headers
  CC      /home/vadim/projects/linux_2/tools/objtool/arch/x86/special.o
In file included from /home/vadim/projects/linux_2/tools/objtool/include/objtool/objtool.h:13,
                 from /home/vadim/projects/linux_2/tools/objtool/include/objtool/arch.h:11,
                 from /home/vadim/projects/linux_2/tools/objtool/include/objtool/check.h:11,
                 from /home/vadim/projects/linux_2/tools/objtool/include/objtool/special.h:10,
                 from arch/x86/special.c:4:
/home/vadim/projects/linux_2/tools/objtool/include/objtool/elf.h:10:10: fatal error: gelf.h: No such file or directory
   10 | #include <gelf.h>
      |          ^~~~~~~~
compilation terminated.
make[4]: *** [/home/vadim/projects/linux_2/tools/build/Makefile.build:98: /home/vadim/projects/linux_2/tools/objtool/arch/x86/special.o] Error 1
make[3]: *** [/home/vadim/projects/linux_2/tools/build/Makefile.build:140: arch/x86] Error 2
make[2]: *** [Makefile:66: /home/vadim/projects/linux_2/tools/objtool/objtool-in.o] Error 2
make[1]: *** [Makefile:73: objtool] Error 2
make: *** [Makefile:1440: tools/objtool] Error 2

Regarding your second question, I don't know how to build a project in a terminal. Talking about 'make distclean defconfig clean' -- I've run it in a terminal outside CLion. If you're talking about building a json with a bear tool, I've run 'bear -- make V=1 bzImage modules' in an ordinary terminal as well.

ok, so first I've installed dependencies which were missing:

sudo dnf install gcc make ncurses-devel bison flex elfutils-libelf-devel openssl-devel

then built the Linux kernel with an ordinary make command.

make

and its modules:

sudo make modules_install

Then I've opened CLion, repeated all the steps from a google doc, and there is still one error:

<command-line>: fatal error: init/utsversion-tmp.h: No such file or directory

Quick googling didn't help, but I didn't need it that much anyway: browsing Linux code now works, previous errors disappeared.