Hi all, I have a CMake library project which contains multiple child CMake projects, each of which produces a single static library.
I want the output of the parent project to be a single static library, containing all of the child libraries. I have spent a while researching, and found a number of suggestions and implementations of cmake functions/macros to do the merging online such as the ones from https://www.mail-archive.com/cmake@cmake.org/msg28670/libutils.cmake, https://github.com/EddieRingle/erbium/blob/master/scripts/cmake/modules/MergeStaticLibs.cmake, https://github.com/FreeRDP/FreeRDP/blob/master/cmake/MergeStaticLibs.cmake. After setting CMP0026 to OLD, I was able to successfully generate a Visual Studio Project using CMake and the last Modelon implementation. This project however, does not contain the references to the other projects in the solution to maintain the build order. If I try and build the project for the main combined library, it immediately complains that the libraries it's trying to combine don't exist. If I manually modify the project to add the reference to the others and then build, Visual Studio correctly builds the dependencies and then combines them. I tried a number of approaches in the CMake files to try and force a dependency for the combined library on the others, but I don't seem to be able to get the dependency correctly carrying through to visual studio. I tried add_dependencies(${combined} ${libs}), I tried add_custom_command(${combined} DEPENDS ${libs}), I tried changing the declaration of the library from add_library(${combined} STATIC ${dummy_file}) to be add_custom_target() instead but no joy. I see a lot of mentions online of Object Libraries, but the child CMake projects are also used in other projects so I can't easily go in and modify them without also impacting others. I understand that, normally, linking static libraries is an unusual thing to do and so that's likely why CMake is ignoring my attempts, but can anyone suggest a way to achieve what it is I'm attempting? Thanks, Rich
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