id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
3950	Cross compilation of FMUs under Windows	Rüdiger Franke	Martin Sjölund	"Recently a 64bit Windows version of OpenModelica was introduced. A separate 32bit version is still needed for the export of 32bit FMUs. This should be covered with cross compilation instead.

Cross compilation already works under Linux, including an extended
   `CevalScriptBackend.buildModelFMU(className = ""MyModel"", platforms = {""i686-w64-mingw32""})`
where `platforms` is a list of ""static"", ""dynamic"" and target triplets, like 32 bit windows in the example. Moreover the OMEdit configuration of FMI export was extended for cross compilation (Tools -> Options -> FMI). The C runtime implements cross compilation of minimal FMUs including source code; the Cpp runtime implements export of full FMUs using pre-compiled runtime libs for the respective target platform.

If cross compilation shall work like under Linux then we need:
  - compilers with the name i686-w64-mingw32-gcc and i686-w64-mingw32-g++ (OMEdit and the FMU makefiles would expect it)
  - static versions of libgcc and libstdc++ (and possibly libwinpthread) along with these compilers
  - call the Cpp FMU makefile with a triplet argument TARGET_TRIPLET=i686-w64-mingw32 (this happens automatically if checked in OMEdit, calling CevalScriptBackend.buildModelFMU with platforms argument)
  - an additional version of the Cpp runtime *_static libs generated with this compiler and placed in the directory ""$(OMHOME)/lib/$(TARGET_TRIPLET)/omc/cpp""

The concept of the target triplet might be extended to msvc. Then msvc libs would not be placed in subdirectories of the gcc libs anymore, like
    $(OMHOME)/lib/omc/cpp/msvc
but besides the gcc libs using another TARGET_TRIPLET, like
    $(OMHOME)/lib/$(TARGET_TRIPLET_FOR_MSVC)/omc/cpp
"	enhancement	new	high	1.10.0	Build Environment				Adrian Pop