installing for Openmodelica about externalmedia

[jowr]

Hi

Have you read this section https://github.com/modelica-3rdparty/ExternalMedia/blob/master/README_compilation.md#quick-start-guide?

In there it says that you can use cmake --build build --config Release --target install-as-default to override the compiler specifications and install the libraries to linux64 or linux.

To build a shared library, you can change line 143 in https://github.com/modelica-3rdparty/ExternalMedia/blob/master/Projects/CMakeLists.txt#L143 to 'SHARED' instead of 'STATIC', but that is untested - thank you being the lab mouse here...

[sjoelund]

It seems to be looking for a shared library .so extension and the CMAKE makes a static. Is this the reason for not finding these external functions?

Because OpenModelica can only run functions at compile-time if they are in a shared library (you cannot use dlopen on a static library), and it thinks the function must be evaluated because some structural information is returned by the function call.

[jowr]

Yes - this is also the reason why the roadmap says that we want to move to shared libraries as the new default. However, we are no there yet.

[sjoelund]

Yes - this is also the reason why the roadmap says that we want to move to shared libraries as the new default. However, we are no there yet.

I would compile both static (with -fPIC) and shared, so the library can be linked into an FMU without problem as well (so many issues with FMUs not finding its dependencies).

[branch171]

Hi

The change to SHARED on line 143 did not work. There is an issue with CoolProp.

/usr/bin/ld: CoolProp/CMakeFiles/CoolProp.dir/src/CoolPropTools.cpp.o: relocation R_X86_64_TPOFF32 against `_ZL10ftw_summer' can not be used when making a shared object; recompile with -fPIC

[branch171]

This can now be closed. You need to do the following

69 SET(COOLPROP_STATIC_LIBRARY OFF CACHE BOOL "Force the static library")
70 SET(COOLPROP_SHARED_LIBRARY ON CACHE BOOL "Force the shared library")
71 SET(COOLPROP_OBJECT_LIBRARY OFF CACHE BOOL "Force the object library")

143 add_library(${LIBRARY_NAME} SHARED ${LIB_SOURCES})
147 target_compile_definitions(${LIBRARY_NAME} PRIVATE EXTERNALMEDIA_MODELICA_ERRORS=0) # Use 0 for a shared library and 1 for a static library

With these changes the shared library compiles and runs the examples in OpenModelica