[Bug]: cmake-4 compatibility warnings

Author: ajakkCreated Aug 16, 2026Updated Aug 16, 2026

Labelsbugneeds confirmation

Checklist

I have read the appropriate section in the contributing guidelines
I believe this issue is a problem with polybar itself and not a misconfiguration on my part
I have searched for other open and closed issues that may have already reported this problem
I have checked the known issues page for this problem.
I have followed the debugging guide to narrow down the problem to a minimal config.

Steps to reproduce

 ~/git/polybar $ git log -1
commit f99e0b1c7a5b094f5a04b14101899d0cb4ece69d (HEAD -> master, origin/master, origin/HEAD)
Author: p_q <[email protected]>
Date:   Wed Sep 10 10:24:55 2025 +0200

    Fix missing cstdint header for compiling with gcc15.

    See https://gcc.gnu.org/gcc-15/porting_to.html for the details.
 ~/git/polybar $ cd build
 ~/git/polybar/build $ cmake ..
[...]
CMake Deprecation Warning at CMakeLists.txt:4 (cmake_minimum_required):
  Compatibility with CMake < 3.10 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.


-- No build type specified; using Release
CMake Warning (dev) at cmake/04-targets.cmake:40 (add_custom_command):
  Exactly one of PRE_BUILD, PRE_LINK, or POST_BUILD must be given.  Assuming
  POST_BUILD to preserve backward compatibility.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  CMakeLists.txt:63 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at cmake/04-targets.cmake:48 (add_custom_command):
  Exactly one of PRE_BUILD, PRE_LINK, or POST_BUILD must be given.  Assuming
  POST_BUILD to preserve backward compatibility.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  CMakeLists.txt:63 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at cmake/04-targets.cmake:57 (add_custom_command):
  Exactly one of PRE_BUILD, PRE_LINK, or POST_BUILD must be given.  Assuming
  POST_BUILD to preserve backward compatibility.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  CMakeLists.txt:63 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at cmake/04-targets.cmake:65 (add_custom_command):
  Exactly one of PRE_BUILD, PRE_LINK, or POST_BUILD must be given.  Assuming
  POST_BUILD to preserve backward compatibility.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  CMakeLists.txt:63 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

Minimal config

dosini

N/A

Polybar log

Expected behavior

N/A

Actual behavior

N/A

Window Manager and Version

N/A

Linux Distribution

Gentoo

Polybar version

polybar @ f99e0b1c7a5b094f5a04b14101899d0cb4ece69d

Additional Context / Screenshots

No response

Source: polybar/polybar

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