Build suceeds but cannot include package and build

[T-Captum]

Hi there,

I have been able to build stdgpu under windows with msvc 2019 and cuda 10.2 with no problems. The example projects work fine. However, taking the installed library and using it in a test setup produces some errors (the same is true for the addsubdirectories route). My CmakeLists.txt is:

cmake_minimum_required(VERSION 3.1)
set (CMAKE_CXX_STANDARD 14)

project(VoxelGrid LANGUAGES CXX CUDA)

file(GLOB srcfiles 
${PROJECT_SOURCE_DIR}/src/*.h   
${PROJECT_SOURCE_DIR}/src/*.cpp
)
include_directories(${PROJECT_SOURCE_DIR}/src)

set(stdgpu_DIR ${PROJECT_SOURCE_DIR}/3rdParty/stdgpu/lib/cmake/stdgpu)
find_package(stdgpu 1.0.0 REQUIRED)

add_executable(VoxelGridTest exe/main.cpp ${srcfiles})
target_link_libraries(VoxelGridTest PUBLIC stdgpu::stdgpu)

in main.cpp I copied the unordered_map example. The build fails with

 FAILED: CMakeFiles/VoxelGridTest.dir/exe/main.cpp.obj 
  C:\PROGRA~2\MICROS~2\2019\COMMUN~1\VC\Tools\MSVC\1427~1.291\bin\Hostx64\x64\cl.exe  /nologo /TP -DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_CUDA -I..\..\src -I..\..\3rdParty\stdgpu\include -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.2\include" /DWIN32 /D_WINDOWS /W3 /GR /EHsc /MD /Zi /O2 /Ob1 /DNDEBUG   -std:c++14 /showIncludes /FoCMakeFiles\VoxelGridTest.dir\exe\main.cpp.obj /FdCMakeFiles\VoxelGridTest.dir\ /FS -c ..\..\exe\main.cpp
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(140): error C2059: syntax error: 'sizeof'
  C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu/atomic.cuh(332): note: see reference to class template instantiation 'stdgpu::atomic<T>' being compiled
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(141): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(150): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(152): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(160): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(162): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(171): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(171): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(172): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(180): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(180): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(181): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(189): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(189): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(190): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(198): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(198): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(199): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(207): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(207): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(208): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(217): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(217): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(218): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(226): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(226): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(227): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(235): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(235): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(236): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(244): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(244): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(245): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(253): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(253): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(254): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(261): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(261): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(262): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(269): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(269): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(270): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(277): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(277): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(278): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(287): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(287): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(288): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(296): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(296): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(297): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(305): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(305): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(306): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(314): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(314): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(315): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(323): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(323): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(324): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(422): error C2059: syntax error: 'sizeof'
  C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu/atomic.cuh(615): note: see reference to class template instantiation 'stdgpu::atomic_ref<T>' being compiled
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(423): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(432): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(434): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(442): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(444): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(453): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(453): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(454): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(462): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(462): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(463): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(471): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(471): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(472): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(480): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(480): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(481): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(489): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(489): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(490): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(499): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(499): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(500): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(508): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(508): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(509): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(517): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(517): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(518): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(526): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(526): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(527): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(535): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(535): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(536): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(543): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(543): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(544): error C2238: unexpected token(s) preceding ';'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(551): error C2988: unrecognizable template declaration/definition
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(551): error C2059: syntax error: 'sizeof'
C:\dev\VoxelGrid\3rdParty\stdgpu\include\stdgpu\atomic.cuh(551): fatal error C1003: error count exceeds 100; stopping compilation

We had a similar issue under linux. Thanks in advance for the support!

[stotko]

This is intentional. atomic as well as all other .cuh files must not be used in .cpp files. Since they define device-only functions, only a device compiler, i.e. NVCC, can compile this correctly.

Rename main.cpp to main.cu and it should work.

[T-Captum]

Okay, thanks a lot. That makes perfect sense.