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Warnings using MSYS2 clangarm64 compiler #803
Description
Just got an Acer Aspire 14 AI laptop 2025 model with Qualcomm X1 26100 CPU and running Windows 11 ARM64 25H2.
There are some warnings when building using MSYS2 clangarm64 compiler. No issues when using MSYS2 ucrt64 gcc 16.1.0.
$ sh build_cmake_clangarm64.sh
-- hidapi: v0.16.0
-- Building hidtest
-- Configuring done (0.1s)
-- Generating done (0.2s)
-- Build files have been written to: C:/work/libusb/hidapi/build/clangarm64
[ 10%] Building C object src/windows/CMakeFiles/hidapi_winapi.dir/hid.c.obj
C:\work\libusb\hidapi\windows\hid.c:129:33: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
129 | static void free_library_handles()
| ^
| void
C:\work\libusb\hidapi\windows\hid.c:139:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
139 | static int lookup_functions()
| ^
| void
C:\work\libusb\hidapi\windows\hid.c:210:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
210 | static hid_device *new_hid_device()
| ^
| void
3 warnings generated.
[ 20%] Building C object src/windows/CMakeFiles/hidapi_winapi.dir/hidapi_descriptor_reconstruct.c.obj
[ 30%] Building RC object src/windows/CMakeFiles/hidapi_winapi.dir/hidapi.rc.obj
[ 40%] Linking C shared library libhidapi.dll
[ 40%] Built target hidapi_winapi
[ 50%] Building C object src/windows/test/CMakeFiles/hid_report_reconstructor_test.dir/hid_report_reconstructor_test.c.obj
[ 60%] Linking C executable hid_report_reconstructor_test.exe
[ 60%] Built target hid_report_reconstructor_test
[ 70%] Building C object src/windows/pp_data_dump/CMakeFiles/pp_data_dump.dir/pp_data_dump.c.obj
In file included from C:\work\libusb\hidapi\windows\pp_data_dump\pp_data_dump.c:6:
C:/work/libusb/hidapi/windows/hid.c:129:33: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
129 | static void free_library_handles()
| ^
| void
C:/work/libusb/hidapi/windows/hid.c:139:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
139 | static int lookup_functions()
| ^
| void
C:/work/libusb/hidapi/windows/hid.c:210:34: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
210 | static hid_device *new_hid_device()
| ^
| void
3 warnings generated.
[ 80%] Linking C executable pp_data_dump.exe
[ 80%] Built target pp_data_dump
[ 90%] Building C object hidtest/CMakeFiles/hidtest.dir/test.c.obj
[100%] Linking C executable hidtest.exe
[100%] Built target hidtest
Install the project...
-- Install configuration: "RelWithDebInfo"
-- Installing: C:/work/libusb/hidapi/install/clangarm64/lib/libhidapi.dll.a
-- Installing: C:/work/libusb/hidapi/install/clangarm64/bin/libhidapi.dll
-- Installing: C:/work/libusb/hidapi/install/clangarm64/include/hidapi/hidapi.h
-- Installing: C:/work/libusb/hidapi/install/clangarm64/include/hidapi/hidapi_winapi.h
-- Installing: C:/work/libusb/hidapi/install/clangarm64/lib/pkgconfig/hidapi.pc
-- Installing: C:/work/libusb/hidapi/install/clangarm64/bin/pp_data_dump.exe
-- Installing: C:/work/libusb/hidapi/install/clangarm64/lib/cmake/hidapi/libhidapi.cmake
-- Installing: C:/work/libusb/hidapi/install/clangarm64/lib/cmake/hidapi/libhidapi-relwithdebinfo.cmake
-- Installing: C:/work/libusb/hidapi/install/clangarm64/lib/cmake/hidapi/hidapi-config-version.cmake
-- Installing: C:/work/libusb/hidapi/install/clangarm64/lib/cmake/hidapi/hidapi-config.cmake
-- Installing: C:/work/libusb/hidapi/install/clangarm64/bin/hidtest.exe
$ cat build_cmake_clangarm64.sh
cmake -G"MinGW Makefiles" -B build/clangarm64 -S . -DCMAKE_BUILD_TYPE=RelWithDebInfo -DHIDAPI_WITH_TESTS=ON -DHIDAPI_BUILD_PP_DATA_DUMP=ON -DCMAKE_INSTALL_PREFIX=install/clangarm64 -DHIDAPI_BUILD_HIDTEST=ON -DCMAKE_C_FLAGS="-Wall -Wextra -pedantic -Wformat-signedness"
cd build/clangarm64
cmake --build . --target install
$ cc -v
clang version 22.1.4 (https://github.com/msys2/MINGW-packages 4b76c6a7ed48c25f3a367f326df493541d7c2a2b)
Target: aarch64-w64-windows-gnu
Thread model: posix
InstalledDir: C:/msys64/clangarm64/bin
Activity
mcuee commentedon May 10, 2026
The laptop seems to have many built-in HID device (only with one Xiaomi Wireless Mouse receiver plugged-in).
hidtest output for Acer Aspire 14 AI 2025 model laptop
mcuee commentedon May 10, 2026
HIDAPI works fine under this Windows 11 ARM64 machine.
Only issue is that Zadig does not work so that I cannot test libusb backend (not officially supported anyway). I cannot switch the system HID driver with WinUSB driver under WIndows 11 ARM64, unlike the normal x86_64 machine.