diff --git a/src/libs/clangsupport/commandlinebuilder.h b/src/libs/clangsupport/commandlinebuilder.h
index 7367f080360..9de1da68d3c 100644
--- a/src/libs/clangsupport/commandlinebuilder.h
+++ b/src/libs/clangsupport/commandlinebuilder.h
@@ -51,6 +51,7 @@ public:
         commandLine.reserve(1024);
 
         addCompiler(projectInfo.language);
+        disableWarnings();
         addToolChainArguments(toolChainArguments);
         addExtraFlags();
         addLanguage(projectInfo, sourceType);
@@ -74,6 +75,8 @@ public:
             commandLine.emplace_back("clang");
     }
 
+    void disableWarnings() { commandLine.emplace_back("-w"); }
+
     void addToolChainArguments(const Utils::SmallStringVector &toolChainArguments)
     {
         for (Utils::SmallStringView argument : toolChainArguments)
diff --git a/tests/unit/unittest/commandlinebuilder-test.cpp b/tests/unit/unittest/commandlinebuilder-test.cpp
index a75c8d8a35c..328b832b9c4 100644
--- a/tests/unit/unittest/commandlinebuilder-test.cpp
+++ b/tests/unit/unittest/commandlinebuilder-test.cpp
@@ -139,6 +139,7 @@ TYPED_TEST(CommandLineBuilder, CHeader)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c-header",
@@ -156,6 +157,7 @@ TYPED_TEST(CommandLineBuilder, CSource)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c",
@@ -174,6 +176,7 @@ TYPED_TEST(CommandLineBuilder, ObjectiveCHeader)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "objective-c-header",
@@ -192,6 +195,7 @@ TYPED_TEST(CommandLineBuilder, ObjectiveCSource)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "objective-c",
@@ -209,6 +213,7 @@ TYPED_TEST(CommandLineBuilder, CppHeader)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -227,6 +232,7 @@ TYPED_TEST(CommandLineBuilder, CppSource)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++",
@@ -246,6 +252,7 @@ TYPED_TEST(CommandLineBuilder, ObjectiveCppHeader)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "objective-c++-header",
@@ -265,6 +272,7 @@ TYPED_TEST(CommandLineBuilder, ObjectiveCppSource)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "objective-c++",
@@ -498,6 +506,7 @@ TYPED_TEST(CommandLineBuilder, IncludesOrder)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -525,6 +534,7 @@ TYPED_TEST(CommandLineBuilder, EmptySourceFile)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -539,6 +549,7 @@ TYPED_TEST(CommandLineBuilder, SourceFile)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -555,6 +566,7 @@ TYPED_TEST(CommandLineBuilder, EmptyOutputFile)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -574,6 +586,7 @@ TYPED_TEST(CommandLineBuilder, OutputFile)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -596,6 +609,7 @@ TYPED_TEST(CommandLineBuilder, IncludePchPath)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -619,6 +633,7 @@ TYPED_TEST(CommandLineBuilder, CompilerMacros)
 
     ASSERT_THAT(builder.commandLine,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
diff --git a/tests/unit/unittest/pchcreator-test.cpp b/tests/unit/unittest/pchcreator-test.cpp
index b28769b51bb..3dbafc8aa08 100644
--- a/tests/unit/unittest/pchcreator-test.cpp
+++ b/tests/unit/unittest/pchcreator-test.cpp
@@ -141,6 +141,7 @@ TEST_F(PchCreator, CreateProjectPartClangCompilerArguments)
 
     ASSERT_THAT(arguments,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
@@ -165,6 +166,7 @@ TEST_F(PchCreator, CreateProjectPartClangCompilerArgumentsWithSystemPch)
 
     ASSERT_THAT(arguments,
                 ElementsAre("clang++",
+                            "-w",
                             "-DNOMINMAX",
                             "-x",
                             "c++-header",
diff --git a/tests/unit/unittest/symbolindexer-test.cpp b/tests/unit/unittest/symbolindexer-test.cpp
index 1e73f8a71b2..ea015bdee65 100644
--- a/tests/unit/unittest/symbolindexer-test.cpp
+++ b/tests/unit/unittest/symbolindexer-test.cpp
@@ -262,6 +262,7 @@ TEST_F(SymbolIndexer, UpdateProjectPartsCallsAddFilesInCollector)
     EXPECT_CALL(mockCollector,
                 setFile(main1PathId,
                         ElementsAre("clang++",
+                                    "-w",
                                     "-Wno-pragma-once-outside-header",
                                     "-DNOMINMAX",
                                     "-x",
@@ -294,6 +295,7 @@ TEST_F(SymbolIndexer, UpdateProjectPartsCallsAddFilesWithPrecompiledHeaderInColl
     EXPECT_CALL(mockCollector,
                 setFile(main1PathId,
                         ElementsAre("clang++",
+                                    "-w",
                                     "-Wno-pragma-once-outside-header",
                                     "-DNOMINMAX",
                                     "-x",
@@ -328,6 +330,7 @@ TEST_F(SymbolIndexer, UpdateProjectPartsCallsAddFilesWithoutPrecompiledHeaderInC
     EXPECT_CALL(mockCollector,
                 setFile(main1PathId,
                         ElementsAre("clang++",
+                                    "-w",
                                     "-Wno-pragma-once-outside-header",
                                     "-DNOMINMAX",
                                     "-x",
@@ -489,6 +492,7 @@ TEST_F(SymbolIndexer, UpdateProjectPartsCallsInOrderWithoutProjectPartArtifact)
     EXPECT_CALL(mockCollector,
                 setFile(main1PathId,
                         ElementsAre("clang++",
+                                    "-w",
                                     "-Wno-pragma-once-outside-header",
                                     "-DNOMINMAX",
                                     "-x",
@@ -541,6 +545,7 @@ TEST_F(SymbolIndexer, UpdateProjectPartsCallsInOrderWithProjectPartArtifact)
     EXPECT_CALL(mockCollector,
                 setFile(Eq(main1PathId),
                         ElementsAre("clang++",
+                                    "-w",
                                     "-Wno-pragma-once-outside-header",
                                     "-DNOMINMAX",
                                     "-x",
@@ -595,6 +600,7 @@ TEST_F(SymbolIndexer, UpdateProjectPartsCallsInOrderButGetsAnErrorForCollectingS
     EXPECT_CALL(mockCollector,
                 setFile(main1PathId,
                         ElementsAre("clang++",
+                                    "-w",
                                     "-Wno-pragma-once-outside-header",
                                     "-DNOMINMAX",
                                     "-x",
@@ -659,6 +665,7 @@ TEST_F(SymbolIndexer, UpdateChangedPathCallsInOrder)
     EXPECT_CALL(mockCollector,
                 setFile(Eq(sourceFileIds[0]),
                         ElementsAre("clang++",
+                                    "-w",
                                     "-DFOO",
                                     "-DNOMINMAX",
                                     "-x",
@@ -721,6 +728,7 @@ TEST_F(SymbolIndexer, UpdateChangedPathCallsInOrderButGetsAnErrorForCollectingSy
     EXPECT_CALL(mockCollector,
                 setFile(Eq(sourceFileIds[0]),
                         ElementsAre("clang++",
+                                    "-w",
                                     "-DFOO",
                                     "-DNOMINMAX",
                                     "-x",
@@ -763,6 +771,7 @@ TEST_F(SymbolIndexer, UpdateChangedPathIsUsingPrecompiledHeader)
     EXPECT_CALL(mockCollector,
                 setFile(Eq(sourceFileIds[0]),
                         ElementsAre("clang++",
+                                    "-w",
                                     "-DFOO",
                                     "-DNOMINMAX",
                                     "-x",
@@ -799,6 +808,7 @@ TEST_F(SymbolIndexer, UpdateChangedPathIsNotUsingPrecompiledHeaderIfItNotExists)
     EXPECT_CALL(mockCollector,
                 setFile(Eq(sourceFileIds[0]),
                         ElementsAre("clang++",
+                                    "-w",
                                     "-DFOO",
                                     "-DNOMINMAX",
                                     "-x",