#5081 causes linking errors if SYCL is not used since GLIBCXX_USE_CXX11_ABI defaults to OFF

[meekersX]

Checklist

• I have searched for similar issues.
• For Python issues, I have tested with the latest development wheel.
• I have checked the release documentation and the latest documentation (for master branch).

Steps to reproduce the issue

I first cloned Open3D by:

git clone https://github.com/isl-org/Open3D.git
cd Open3D

Then, I build Open3D (on Ubuntu 20.04) with:

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make -j$(nproc)

This causes linking errors for a dependent project of mine:

undefined reference to `cv::imwrite(std::string const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'

If built instead with:

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release cmake -DCMAKE_BUILD_TYPE=Release -DGLIBCXX_USE_CXX11_ABI=ON ..
make -j$(nproc)

Then there are no linking errors.

Error message

undefined reference to `cv::imwrite(std::string const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'

Open3D, Python and System information

- Operating system: Ubuntu 20.04
- System architecture: x86
- Is this a remote workstation?: no
- How did you install Open3D?: build from source
- Compiler version (if built from source): gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0

Additional information

I think the specific commit that causes the issue is here: 0702325

option(GLIBCXX_USE_CXX11_ABI "Set -D_GLIBCXX_USE_CXX11_ABI=1" ON )

option(BUILD_SYCL_MODULE          "Build SYCL module with Intel oneAPI"      OFF)
if(BUILD_SYCL_MODULE)
    option(GLIBCXX_USE_CXX11_ABI  "Set -D_GLIBCXX_USE_CXX11_ABI=1"           ON )
else()
    option(GLIBCXX_USE_CXX11_ABI  "Set -D_GLIBCXX_USE_CXX11_ABI=1"           OFF)
endif()

I haven't investigated enough to determine the proper solution, but I thought I should make the issue visible here.

[meekersX]

Fixed by #6206