[core] Add a test for TColorGradient and disable failing tests on mac beta

core/base/test/CMakeLists.txt

@@ -27,6 +27,25 @@ ROOT_ADD_GTEST(CoreErrorTests TErrorTests.cxx LIBRARIES Core)
 ROOT_ADD_GTEST(CoreSystemTests TSystemTests.cxx LIBRARIES Core)
 
 ROOT_ADD_GTEST(CoreColorTests TColorTests.cxx LIBRARIES Core)
+if(CMAKE_SYSTEM_NAME MATCHES "Darwin" AND CMAKE_HOST_SYSTEM_VERSION VERSION_GREATER_EQUAL 25.4)
+  set_tests_properties(gtest-core-base-CoreColorTests PROPERTIES DISABLED True)
+  file(GENERATE
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/run_until_failure
+    CONTENT
+"import subprocess
+for _ in range(100):
+    try:
+        subprocess.run(['$<TARGET_FILE:CoreColorTests>'], check=True)
+    except subprocess.CalledProcessError as e:
+        print('This test is expected to fail with a stack corruption: ', e)
+        exit(123)
+print('This test was expected to fail with a stack corruption. Check if it got fixed.')
+exit(1)"
+    TARGET CoreColorTests)
+
+  add_test(NAME CoreColor_RunUntilFailure COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/run_until_failure)
+  set_tests_properties(CoreColor_RunUntilFailure PROPERTIES SKIP_RETURN_CODE 123)
+endif()
 
 configure_file(Foo.C Foo.C COPYONLY)
 ROOT_ADD_GTEST(IncludePathTest IncludePathTest.cxx LIBRARIES Core)

core/base/test/TColorTests.cxx

@@ -26,3 +26,24 @@ TEST(TColor, Hex8String)
    EXPECT_NEAR(color->GetBlue(), 0.690196, 1e-4);
    EXPECT_NEAR(color->GetAlpha(), 0.466667, 1e-4);
 }
+
+// ROOT-21367: On mac beta, the constructor of TColorGradient crashes with a stack corruption
+TEST(TColor, Gradient)
+{
+   auto fcol1 = TColor::GetColor((Float_t)0.25, 0.25, 0.25, 0.55); // special frame color 1
+   auto fcol2 = TColor::GetColor((Float_t)1., 1., 1., 0.05);       // special frame color 2
+
+   auto frameGradient = TColor::GetLinearGradient(0., {fcol1, fcol2, fcol2, fcol1}, {0., 0.2, 0.8, 1.});
+
+   // This gradient is a mixture of two standard colors.
+   auto padGradient = TColor::GetLinearGradient(0., {30, 38});
+
+   // Another gradient built from three standard colors.
+   auto histGradient = TColor::GetLinearGradient(45., {kYellow, kOrange, kRed});
+
+   EXPECT_NE(fcol1, frameGradient);
+   EXPECT_NE(fcol1, padGradient);
+   EXPECT_NE(fcol1, histGradient);
+   EXPECT_NE(frameGradient, padGradient);
+   EXPECT_NE(padGradient, histGradient);
+}

tutorials/CMakeLists.txt

@@ -740,6 +740,13 @@ foreach(t ${tutorials})
   if(${t} IN_LIST multithreaded)
     set_tests_properties(tutorial-${tname} PROPERTIES PROCESSORS ${NProcessors})
   endif()
+
+  if(CMAKE_SYSTEM_NAME MATCHES "Darwin" AND CMAKE_HOST_SYSTEM_VERSION VERSION_GREATER_EQUAL 25.4 AND tname MATCHES "gl-.*grad")
+    # ROOT-21367
+    # On mac beta, there is a stack corruption (suspected to be a compiler bug) that may fail these tests
+    set_tests_properties(tutorial-${tname} PROPERTIES DISABLED True)
+    message(NOTICE "Disabling tutorial ${tname} for mac beta")
+  endif()
 endforeach()
 
 #---Loop over all MPI tutorials and define the corresponding test---------