Failure to build on Windows with scalar variants only

[C8620]

I am trying to get around with some type conversion issues with my custom code and to do that I am attempting to use scalar variants only, in which Float are float or double instead of arrays, which is hard to operate on on some occasions.

However, while I was attempting to build mitsuba on Windows using MSVC (Visual Studio 2022), I get following error:

(compiling source file '../../../src/shapes/sdfgrid.cpp')
  B:\mitsuba3\ext\drjit\include\drjit\array_generic.h(147,79):
  the template instantiation context (the oldest one first) is
        B:\mitsuba3\src\shapes\sdfgrid.cpp(755,34):
        see reference to function template instantiation 'mitsuba::Point<drjit::Packet<float,16>,2>::Point<int,int,0>(i
  nt &&,int &&)' being compiled
        B:\mitsuba3\src\shapes\sdfgrid.cpp(1091,1):
        see reference to function template instantiation 'drjit::StaticArrayImpl<Value_,2,false,mitsuba::Point<Value_,2
  >,int>::StaticArrayImpl<int,int,0>(int &&,int &&)' being compiled
          with
          [
              Value_=drjit::Packet<float,16>
          ]

     Creating library B:/mitsuba3/build/src/shapes/Debug/sdfgrid.lib and object B:/mitsuba3/build/src/shapes/Debug/sdfg
  rid.exp
sdfgrid.obj : error LNK2019: unresolved external symbol __imp_jit_malloc referenced in function "private: class std::tu
ple<void *,unsigned __int64 *,void *,unsigned __int64 *,unsigned __int64> __cdecl mitsuba::SDFGrid<float,struct mitsuba
::Color<float,3> >::build_bboxes(void)" (?build_bboxes@?$SDFGrid@MU?$Color@M$02@mitsuba@@@mitsuba@@AEAA?AV?$tuple@PEAXP
EA_KPEAXPEA_K_K@std@@XZ) [B:\mitsuba3\build\src\shapes\sdfgrid.vcxproj]
sdfgrid.obj : error LNK2019: unresolved external symbol __imp_jit_free referenced in function "public: virtual __cdecl
mitsuba::SDFGrid<float,struct mitsuba::Color<float,3> >::~SDFGrid<float,struct mitsuba::Color<float,3> >(void)" (??1?$S
DFGrid@MU?$Color@M$02@mitsuba@@@mitsuba@@UEAA@XZ) [B:\mitsuba3\build\src\shapes\sdfgrid.vcxproj]
B:\mitsuba3\build\Debug\plugins\sdfgrid.dll : fatal error LNK1120: 2 unresolved externals [B:\mitsuba3\build\src\shapes
\sdfgrid.vcxproj]

No mitsuba.exe is generated. If there is an exe file from previous successful builds, the executable will have no entry point.

I went on to delete the mitsuba3 folder altogether and re-cloned it from GitHub, changed mitsuba.conf, re-run cmake, and build with Debug target, yielding the same result. Same with Release target.

I continued with building on WSL2, which is a Ubuntu 22.04, and build went through with no errors despite have only scalar variants.

Any idea why this might happened, or what I have done wrong?

[wjakob]

I think you (for now) need to enable a JIT (LLVM, CUDA) variant even if you never use it, for the build to work properly.