Warnings when build hidapitester using CMake

[mcuee]

Not so sure if this is a real issue or not. Or maybe it is not an hidapi issue but rather hidapitester issue.

PS C:\work\libusb\hidapitester> cd .\build_vs2026\
PS C:\work\libusb\hidapitester\build_vs2026> cmake ..
-- Building for: Visual Studio 18 2026
-- The C compiler identification is MSVC 19.50.35730.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/18/Community/VC/Tools/MSVC/14.50.35717/bin/Hostx64/x64/cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- hidapitester version: v0.6
-- Using local HIDAPI from: C:/work/libusb/hidapitester/../hidapi
-- Configuring done (15.0s)
-- Generating done (0.2s)
-- Build files have been written to: C:/work/libusb/hidapitester/build_vs2026

PS C:\work\libusb\hidapitester\build_vs2026> cmake --build . --config RelWithDebInfo
MSBuild version 18.5.4+cb4e32d21 for .NET Framework

  1>Checking Build System
  Building Custom Rule C:/work/libusb/hidapitester/build_vs2026/_deps/getopt_win-src/CMakeLists.txt
  getopt.c
  Warning static builds of getopt violate the Lesser GNU Public License
  getopt_static.vcxproj -> C:\work\libusb\hidapitester\build_vs2026\_deps\getopt_win-build\RelWithDebInfo\getopt_static
  .lib
  Building Custom Rule C:/work/libusb/hidapi/windows/CMakeLists.txt
  hid.c
  hidapi_descriptor_reconstruct.c
  Generating Code...
hid.obj : warning LNK4006: hid_winapi_descriptor_reconstruct_pp_data already defined in hidapi_descriptor_reconstruct.o
bj; second definition ignored [C:\work\libusb\hidapitester\build_vs2026\hidapi\src\windows\hidapi_winapi.vcxproj]
  hidapi_winapi.vcxproj -> C:\work\libusb\hidapitester\build_vs2026\hidapi\src\windows\RelWithDebInfo\hidapi.lib
  Building Custom Rule C:/work/libusb/hidapitester/CMakeLists.txt
  hidapitester.c
  Warning static builds of getopt violate the Lesser GNU Public License
C:\work\libusb\hidapitester\hidapitester.c(330,77): warning C4477: 'swprintf' : format string '%s' requires an argument
 of type 'unsigned short *', but variadic argument 1 has type 'char *' [C:\work\libusb\hidapitester\build_vs2026\hidapi
tester.vcxproj]
      C:\work\libusb\hidapitester\hidapitester.c(330,77):
      consider using '%hs' in the format string
      C:\work\libusb\hidapitester\hidapitester.c(330,77):
      consider using '%Ts' in the format string
      C:\work\libusb\hidapitester\hidapitester.c(330,77):
      this warning is based on non-standard semantics used by Visual C++

  hidapitester.vcxproj -> C:\work\libusb\hidapitester\build_vs2026\RelWithDebInfo\hidapitester.exe
  Building Custom Rule C:/work/libusb/hidapitester/CMakeLists.txt

[mcuee]

No issues when building hidapi itself with VS2026.

PS C:\work\libusb\hidapi\build_vs2026> cmake -DHIDAPI_WITH_TESTS=ON -DHIDAPI_BUILD_PP_DATA_DUMP=ON -DHIDAPI_BUILD_HIDTEST=ON ..
-- Building for: Visual Studio 18 2026
-- The C compiler identification is MSVC 19.50.35730.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/18/Community/VC/Tools/MSVC/14.50.35717/bin/Hostx64/x64/cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- hidapi: v0.16.0
-- Building hidtest
-- Configuring done (3.4s)
-- Generating done (0.4s)
-- Build files have been written to: C:/work/libusb/hidapi/build_vs2026

PS C:\work\libusb\hidapi\build_vs2026> cmake --build . --config RelWithDebInfo
MSBuild version 18.5.4+cb4e32d21 for .NET Framework

  1>Checking Build System
  Building Custom Rule C:/work/libusb/hidapi/windows/CMakeLists.txt
  hid.c
  hidapi_descriptor_reconstruct.c
  Generating Code...
     Creating library C:/work/libusb/hidapi/build_vs2026/src/windows/RelWithDebInfo/hidapi.lib and object C:/work/libus
  b/hidapi/build_vs2026/src/windows/RelWithDebInfo/hidapi.exp
  hidapi_winapi.vcxproj -> C:\work\libusb\hidapi\build_vs2026\src\windows\RelWithDebInfo\hidapi.dll
  Building Custom Rule C:/work/libusb/hidapi/windows/test/CMakeLists.txt
  hid_report_reconstructor_test.c
  hid_report_reconstructor_test.vcxproj -> C:\work\libusb\hidapi\build_vs2026\src\windows\test\RelWithDebInfo\hid_repor
  t_reconstructor_test.exe
  Building Custom Rule C:/work/libusb/hidapi/hidtest/CMakeLists.txt
  test.c
  hidtest.vcxproj -> C:\work\libusb\hidapi\build_vs2026\hidtest\RelWithDebInfo\hidtest.exe
  Building Custom Rule C:/work/libusb/hidapi/windows/pp_data_dump/CMakeLists.txt
  pp_data_dump.c
     Creating library C:/work/libusb/hidapi/build_vs2026/src/windows/pp_data_dump/RelWithDebInfo/pp_data_dump.lib and o
  bject C:/work/libusb/hidapi/build_vs2026/src/windows/pp_data_dump/RelWithDebInfo/pp_data_dump.exp
  pp_data_dump.vcxproj -> C:\work\libusb\hidapi\build_vs2026\src\windows\pp_data_dump\RelWithDebInfo\pp_data_dump.exe
  Building Custom Rule C:/work/libusb/hidapi/CMakeLists.txt

[mcuee]

@todbot

FYI as well.

[todbot]

The warning you're seeing is within hidapitester, not libusb, so this issue should be opened there. I opened one there.

[mcuee]

Thanks for the fast fix.

PS C:\work\libusb\hidapitester\build_vs2026> cmake ..
-- Building for: Visual Studio 18 2026
-- The C compiler identification is MSVC 19.50.35730.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/18/Community/VC/Tools/MSVC/14.50.35717/bin/Hostx64/x64/cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- hidapitester version: v0.6
-- Using local HIDAPI from: C:/work/libusb/hidapitester/../hidapi
-- Configuring done (11.6s)
-- Generating done (0.2s)
-- Build files have been written to: C:/work/libusb/hidapitester/build_vs2026
PS C:\work\libusb\hidapitester\build_vs2026> cmake --build . --config RelWithDebInfo
MSBuild version 18.5.4+cb4e32d21 for .NET Framework

  1>Checking Build System
  Building Custom Rule C:/work/libusb/hidapitester/build_vs2026/_deps/getopt_win-src/CMakeLists.txt
  getopt.c
  Warning static builds of getopt violate the Lesser GNU Public License
  getopt_static.vcxproj -> C:\work\libusb\hidapitester\build_vs2026\_deps\getopt_win-build\RelWithDebInfo\getopt_static
  .lib
  Building Custom Rule C:/work/libusb/hidapi/windows/CMakeLists.txt
  hid.c
  hidapi_descriptor_reconstruct.c
  Generating Code...
hid.obj : warning LNK4006: hid_winapi_descriptor_reconstruct_pp_data already defined in hidapi_descriptor_reconstruct.o
bj; second definition ignored [C:\work\libusb\hidapitester\build_vs2026\hidapi\src\windows\hidapi_winapi.vcxproj]
  hidapi_winapi.vcxproj -> C:\work\libusb\hidapitester\build_vs2026\hidapi\src\windows\RelWithDebInfo\hidapi.lib
  Building Custom Rule C:/work/libusb/hidapitester/CMakeLists.txt
  hidapitester.c
  Warning static builds of getopt violate the Lesser GNU Public License
  hidapitester.vcxproj -> C:\work\libusb\hidapitester\build_vs2026\RelWithDebInfo\hidapitester.exe
  Building Custom Rule C:/work/libusb/hidapitester/CMakeLists.txt
PS C:\work\libusb\hidapitester\build_vs2026>

[mcuee]

Not so sure about the warning about hid.obj.

[todbot]

Not so sure about the warning about hid.obj.

Yeah no clue. I don't compile under MSVC very often. That does seem like a hidapi Windows issue though.

[mcuee]

@Youw

Please check if the warning about hid.obj is an issue with hidapi or not. Thanks.

hid.obj : warning LNK4006: hid_winapi_descriptor_reconstruct_pp_data already defined in hidapi_descriptor_reconstruct.o
bj; second definition ignored [C:\work\libusb\hidapitester\build_vs2026\hidapi\src\windows\hidapi_winapi.vcxproj]