[Bug]: implicit declaration of function ‘drm_fb_helper_alloc_info’

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Tech-Stack
c, linux
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backend

Rechercherichtung

The failure is reported in guest additions at /tmp/vbox.0/vbox_fb.c:337 while building against Ubuntu’s Linux 6.8 kernel; the issue also says the build succeeds with 5.15. Start by reading the corresponding vbox_fb.c code and the uploaded build logs, then compare the kernel interfaces used by both versions. Done means guest additions compile successfully against 6.8 without breaking the reported 5.15 build.

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Beschreibung

bug
Version

7.2.22

Host OS Type

Windows

Host OS name + version

Version 10.0.19045.7846

Host Architecture

x86

Guest OS Type

Linux

Guest Architecture

x86

Guest OS name + version

Ubuntu 22.04.5 LTS

Component

Guest Additions/Other

What happened?

Compiling guest additions in the process of routine upgrade of the kernel to 6.8.0-149 in Ubuntu 22.04.5 LTS I am getting (via apt upgrade):

warning: the compiler differs from the one used to build the kernel
  The kernel was built by: x86_64-linux-gnu-gcc-12 (Ubuntu 
12.3.0-1ubuntu1~22.04.3) 12.3.0
  You are using:           gcc-12 (Ubuntu 12.3.0-1ubuntu1~22.04.3) 12.3.0

Why is that? They look quite identical to me!

This is fatal, though:

/tmp/vbox.0/vbox_fb.c:337:16: error: implicit declaration of function 
‘drm_fb_helper_alloc_info’; did you mean ‘drm_fb_helper_fill_info’? 
[-Werror=implicit-function-declaration]
  337 |         info = drm_fb_helper_alloc_info(helper);
      |                ^~~~~~~~~~~~~~~~~~~~~~~~
      |                drm_fb_helper_fill_info
/tmp/vbox.0/vbox_fb.c:337:14: warning: assignment to ‘struct fb_info *’ 
from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
  337 |         info = drm_fb_helper_alloc_info(helper);
      |              ^
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:243: /tmp/vbox.0/vbox_fb.o] Error 1
make[2]: *** Waiting for unfinished jobs....
# cmd_gen_objtooldep /tmp/vbox.0/vbox_drv.o

Meanwhile, kernel 5.15.0-203 (which comes in the same upgrade) compiled guest additions without any issues.

I'm using the most up to date VirtualBx 7.2.22-175245 with its current extension package of the same version (7.2.22)

How can we reproduce this?

I don't know how can "you" reproduce this, but it's obviously a compilation bug suggesting that some feature macros (such as for the kernel version number) were not placed around the pieces of code, which are version-dependent (because an earlier kernel 5.15.0-203 does not show the same problem).

Did you upload all of your necessary log files, screenshots, etc.?
  • Yes, I've uploaded all pertinent files to this issue.
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