From 89f8d4ae1235df19f49ba3167f0e4f2b4acc5c0a Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Sun, 15 May 2022 16:20:45 +0000
Subject: [PATCH] build: GCC12 warnings

---
 3rdparty/libpng/CMakeLists.txt          | 4 +++-
 3rdparty/libtiff/CMakeLists.txt         | 3 ++-
 apps/traincascade/cascadeclassifier.cpp | 2 +-
 modules/ts/src/ts_gtest.cpp             | 2 +-
 4 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/3rdparty/libpng/CMakeLists.txt b/3rdparty/libpng/CMakeLists.txt
index efa59627eb..f72b966079 100644
--- a/3rdparty/libpng/CMakeLists.txt
+++ b/3rdparty/libpng/CMakeLists.txt
@@ -77,7 +77,9 @@ endif(MSVC)
 add_library(${PNG_LIBRARY} STATIC ${OPENCV_3RDPARTY_EXCLUDE_FROM_ALL} ${lib_srcs} ${lib_hdrs})
 target_link_libraries(${PNG_LIBRARY} ${ZLIB_LIBRARIES})
 
-ocv_warnings_disable(CMAKE_C_FLAGS -Wundef -Wcast-align -Wimplicit-fallthrough -Wunused-parameter -Wsign-compare)
+ocv_warnings_disable(CMAKE_C_FLAGS -Wundef -Wcast-align -Wimplicit-fallthrough -Wunused-parameter -Wsign-compare
+    -Wmaybe-uninitialized
+)
 
 set_target_properties(${PNG_LIBRARY}
   PROPERTIES OUTPUT_NAME ${PNG_LIBRARY}
diff --git a/3rdparty/libtiff/CMakeLists.txt b/3rdparty/libtiff/CMakeLists.txt
index 2074888a52..99c1933d22 100644
--- a/3rdparty/libtiff/CMakeLists.txt
+++ b/3rdparty/libtiff/CMakeLists.txt
@@ -452,8 +452,9 @@ ocv_warnings_disable(CMAKE_C_FLAGS -Wno-unused-but-set-variable -Wmissing-protot
                                    -Wcast-align -Wshadow -Wno-maybe-uninitialized -Wno-pointer-to-int-cast -Wno-int-to-pointer-cast
                                    -Wmisleading-indentation
                                    -Wimplicit-fallthrough
+                                   -Wunused-parameter  # clang
+                                   -Warray-parameter
 )
-ocv_warnings_disable(CMAKE_C_FLAGS -Wunused-parameter) # clang
 ocv_warnings_disable(CMAKE_CXX_FLAGS -Wmissing-declarations -Wunused-parameter -Wmissing-prototypes
     -Wundef  # tiffiop.h: #if __clang_major__ >= 4
 )
diff --git a/apps/traincascade/cascadeclassifier.cpp b/apps/traincascade/cascadeclassifier.cpp
index 3d7b383258..5a83746bc4 100644
--- a/apps/traincascade/cascadeclassifier.cpp
+++ b/apps/traincascade/cascadeclassifier.cpp
@@ -252,7 +252,7 @@ bool CvCascadeClassifier::train( const string _cascadeDirName,
             fs << "}";
         }
         // save current stage
-        char buf[10];
+        char buf[32];
         sprintf(buf, "%s%d", "stage", i );
         string stageFilename = dirName + buf + ".xml";
         FileStorage fs( stageFilename, FileStorage::WRITE );
diff --git a/modules/ts/src/ts_gtest.cpp b/modules/ts/src/ts_gtest.cpp
index a65ef721a2..030c56bb4f 100644
--- a/modules/ts/src/ts_gtest.cpp
+++ b/modules/ts/src/ts_gtest.cpp
@@ -8716,7 +8716,7 @@ static void StackLowerThanAddress(const void* ptr, bool* result) {
 // Make sure AddressSanitizer does not tamper with the stack here.
 GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
 static bool StackGrowsDown() {
-  int dummy;
+  int dummy = 0;
   bool result;
   StackLowerThanAddress(&dummy, &result);
   return result;