Allow using all pipeline nodes from a single executable #1208
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Many of the samples implement parts of the pipeline, so it makes sense to use the same aliceVision_main() API as for the rest of pipeline nodes.
Many of the samples implement parts of the pipeline, so it makes sense to use the same aliceVision_main() API as for the rest of pipeline nodes.
Currently main() of the executables defined in the project resides in aliceVision/system/main.hpp file which is #included into each of the executables. This makes it impossible to compile the executable code as a static library. Injecting main() exclusively via CMake avoids this problem.
This will make it possible to compile the reusable parts of the executables once and then link into whatever destination needed, be it a part of user application, a standalone executable or a shared library.
This will make it possible to link multiple pipeline nodes into a single executable.
This ensures that we accidentally don't create two static libraries with duplicate symbols. In any duplicate symbols should be hidden by using unnamed namespaces or `static`.
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This was referenced Oct 2, 2022
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This will make it possible to compile the reusable parts of the executables once and then link into whatever destination needed, be it a part of user application, a standalone executable or a shared library.
Ability to not require usage of multiple executables is especially important on certain mobile platforms where this is not supported.
The idea behind the implementation is relatively simple: all aliceVision executables are compiled through a single CMake function (
alicevision_add_software) and all entry points of these executables are already named asaliceVision_main. Ifalicevision_add_softwareis modified to compile the reusable code as a static library and redefinealiceVision_mainto a unique symbol, then all of such static libraries can be easily combined into a single executable.The current solution is the minimal one and the most simple one (whole PR is only around a hundred of lines). Going into the future we can expose the pipeline nodes better and provide more user-friendly API.