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Merge pull request #29120 from asmorkalov:as/png_warning_check

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Libpng warning fix on Windows #29120

CI warning:
```
  Warning: C:\GHA-OCV-3\_work\opencv\opencv\opencv\3rdparty\libpng\pngread.c(4114,21): warning C4146: unary minus operator applied to unsigned type, result still unsigned [C:\GHA-OCV-3\_work\opencv\opencv\build\3rdparty\libpng\libpng.vcxproj]
  Warning: C:\GHA-OCV-3\_work\opencv\opencv\opencv\3rdparty\libpng\pngwrite.c(2033,21): warning C4146: unary minus operator applied to unsigned type, result still unsigned [C:\GHA-OCV-3\_work\opencv\opencv\build\3rdparty\libpng\libpng.vcxproj]
```

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [ ] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
This commit is contained in:
Alexander Smorkalov
2026-05-25 08:39:58 +03:00
committed by GitHub
parent 00d19e1c63
commit 8472efd791
1 changed files with 1 additions and 0 deletions
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3rdparty/libpng/CMakeLists.txt
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@@ -278,6 +278,7 @@ endif(PNG_HARDWARE_OPTIMIZATIONS)
if(MSVC) if(MSVC)
add_definitions(-D_CRT_SECURE_NO_DEPRECATE) add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
ocv_warnings_disable(CMAKE_C_FLAGS /wd4146)
endif(MSVC) endif(MSVC)
add_library(${PNG_LIBRARY} STATIC ${OPENCV_3RDPARTY_EXCLUDE_FROM_ALL} ${lib_srcs} ${lib_hdrs}) add_library(${PNG_LIBRARY} STATIC ${OPENCV_3RDPARTY_EXCLUDE_FROM_ALL} ${lib_srcs} ${lib_hdrs})