Let's assume you cloned the repo into cpp_ub_template_multiple_inst folder and created build folder for building.

Configure the project with cmake altering values of the following two options CMAKE_BUILD_TYPE and FORWARD_LINK_ORDER. Use 4 possible sets of values

• CMAKE_BUILD_TYPE=Debug FORWARD_LINK_ORDER=On
• CMAKE_BUILD_TYPE=Debug FORWARD_LINK_ORDER=Off
• CMAKE_BUILD_TYPE=Release FORWARD_LINK_ORDER=On
• CMAKE_BUILD_TYPE=Release FORWARD_LINK_ORDER=Off

and test the output.

rm -rf build
mkdir build
cmake -S cpp_ub_template_multiple_inst -B build -DCMAKE_BUILD_TYPE=Debug -DFORWARD_LINK_ORDER=On
cmake --build build -j`nproc`
build/test

rm -rf build
mkdir build
cmake -S cpp_ub_template_multiple_inst -B build -DCMAKE_BUILD_TYPE=Debug -DFORWARD_LINK_ORDER=Off
cmake --build build -j`nproc`
build/test

rm -rf build
mkdir build
cmake -S cpp_ub_template_multiple_inst -B build -DCMAKE_BUILD_TYPE=Release -DFORWARD_LINK_ORDER=On
cmake --build build -j`nproc`
build/test

rm -rf build
mkdir build
cmake -S cpp_ub_template_multiple_inst -B build -DCMAKE_BUILD_TYPE=Release -DFORWARD_LINK_ORDER=Off
cmake --build build -j`nproc`
build/test

We observed the below outputs

intSum1 = 15 intSum2 = 15
intSum1 = 115 intSum2 = 115
intSum1 = 15 intSum2 = 115
intSum1 = 15 intSum2 = 115