[Buildroot] [Bug 16006] New: package/opencv4: Debian12 + ccache: fatal error: stdlib.h: No such file or directory

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=16006

            Bug ID: 16006
           Summary: package/opencv4: Debian12 + ccache: fatal error:
                    stdlib.h: No such file or directory
           Product: buildroot
           Version: 2024.02
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: niziak at spox.org
                CC: buildroot at uclibc.org
  Target Milestone: ---

Hi.
I cannot build opencv4 package under Debian 12 (on older Debian it works). I've
prepared minimum scenario to reproduce:

Download and unpack: `buildroot-2024.02.tar.gz`

Go to BR dir.

make freescale_imx8mmevk_defconfig
./utils/config --enable CCACHE
./utils/config --enable TOOLCHAIN_EXTERNAL
./utils/config --enable PACKAGE_OPENCV4
./utils/config --enable PACKAGE_OPENCV4_WITH_TBB
make olddefconfig
make opencv4

...

[ 29%] Building CXX object
modules/core/CMakeFiles/opencv_core.dir/src/directx.cpp.o
In file included from
/home/runner/buildroot-2024.02/output/host/opt/ext-toolchain/aarch64-none-linux-gnu/include/c++/13.2.1/bits/stl_algo.h:71,
                 from
/home/runner/buildroot-2024.02/output/host/opt/ext-toolchain/aarch64-none-linux-gnu/include/c++/13.2.1/algorithm:61,
                 from
/home/runner/buildroot-2024.02/output/build/opencv4-4.9.0/modules/core/include/opencv2/core/base.hpp:55,
                 from
/home/runner/buildroot-2024.02/output/build/opencv4-4.9.0/modules/core/include/opencv2/core/utils/buffer_area.private.hpp:7,
                 from
/home/runner/buildroot-2024.02/output/build/opencv4-4.9.0/modules/core/src/buffer_area.cpp:5:
/home/grunner/buildroot-2024.02/output/host/opt/ext-toolchain/aarch64-none-linux-gnu/include/c++/13.2.1/cstdlib:79:15:
fatal error: stdlib.h: No such file or directory
   79 | #include_next <stdlib.h>
      |               ^~~~~~~~~~
compilation terminated.
...

It looks like sth is messed in opencv4 cmake files.

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