Use explicit no-sse flags when SSE is off

Also:
- Silence clang warnings about unsupported command line arguments
- Add diagnostic print to calib3d test
- Fixed perf test relative error check
- Fix iOS build problem

cmake/OpenCVCompilerOptions.cmake

@@ -98,6 +98,10 @@ if(CMAKE_COMPILER_IS_GNUCXX)
     add_extra_compiler_option(-pthread)
   endif()
 
+  if(CMAKE_COMPILER_IS_CLANGCXX)
+    add_extra_compiler_option(-Qunused-arguments)
+  endif()
+
   if(OPENCV_WARNINGS_ARE_ERRORS)
     add_extra_compiler_option(-Werror)
   endif()
@@ -127,6 +131,8 @@ if(CMAKE_COMPILER_IS_GNUCXX)
   endif()
   if(ENABLE_SSE2)
     add_extra_compiler_option(-msse2)
+  elseif(X86 OR X86_64)
+    add_extra_compiler_option(-mno-sse2)
   endif()
   if(ENABLE_NEON)
     add_extra_compiler_option("-mfpu=neon")
@@ -139,6 +145,8 @@ if(CMAKE_COMPILER_IS_GNUCXX)
   if(NOT MINGW)
     if(ENABLE_AVX)
       add_extra_compiler_option(-mavx)
+    elseif(X86 OR X86_64)
+      add_extra_compiler_option(-mno-avx)
     endif()
     if(ENABLE_AVX2)
       add_extra_compiler_option(-mavx2)
@@ -152,18 +160,26 @@ if(CMAKE_COMPILER_IS_GNUCXX)
     if(NOT OPENCV_EXTRA_CXX_FLAGS MATCHES "-mavx")
       if(ENABLE_SSE3)
         add_extra_compiler_option(-msse3)
+      elseif(X86 OR X86_64)
+        add_extra_compiler_option(-mno-sse3)
       endif()
 
       if(ENABLE_SSSE3)
         add_extra_compiler_option(-mssse3)
+      elseif(X86 OR X86_64)
+        add_extra_compiler_option(-mno-ssse3)
       endif()
 
       if(ENABLE_SSE41)
         add_extra_compiler_option(-msse4.1)
+      elseif(X86 OR X86_64)
+        add_extra_compiler_option(-mno-sse4.1)
       endif()
 
       if(ENABLE_SSE42)
         add_extra_compiler_option(-msse4.2)
+      elseif(X86 OR X86_64)
+        add_extra_compiler_option(-mno-sse4.2)
       endif()
 
       if(ENABLE_POPCNT)

modules/calib3d/test/test_solvepnp_ransac.cpp

@@ -183,6 +183,9 @@ protected:
                         method, totalTestsCount - successfulTestsCount, totalTestsCount, maxError, mode);
                     ts->set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY);
                 }
+                cout << "mode: " << mode << ", method: " << method << " -> "
+                     << ((double)successfulTestsCount / totalTestsCount) * 100 << "%"
+                     << " (err < " << maxError << ")" << endl;
             }
         }
     }

modules/ts/src/ts_perf.cpp

@@ -438,9 +438,9 @@ static int countViolations(const cv::Mat& expected, const cv::Mat& actual, const
 
     if (v > 0 && max_violation != 0 && max_allowed != 0)
     {
-        int loc[10];
+        int loc[10] = {0};
         cv::minMaxIdx(maximum, 0, max_allowed, 0, loc, mask);
-        *max_violation = diff64f.at<double>(loc[1], loc[0]);
+        *max_violation = diff64f.at<double>(loc[0], loc[1]);
     }
 
     return v;