diff --git a/.github/workflows/build-and-test.sh b/.github/workflows/build-and-test.sh
index 8fd95f9..6a33c39 100755
--- a/.github/workflows/build-and-test.sh
+++ b/.github/workflows/build-and-test.sh
@@ -23,3 +23,9 @@
 end_section
 
 ##########################################################################
+
+start_section Cleanup
+make clean -j`nproc`
+end_section
+
+##########################################################################
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 42f5810..5fb51b9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@
         sudo apt-get install git g++-9 build-essential bison flex \
           libreadline-dev gawk tcl-dev libffi-dev git graphviz xdot \
           pkg-config libboost-system-dev libboost-python-dev \
-          libboost-filesystem-dev zlib1g-dev
+          libboost-filesystem-dev zlib1g-dev clang-format-5.0
 
     - name: Install Yosys
       run: source .github/workflows/setup.sh
@@ -29,3 +29,8 @@
       run: source .github/workflows/build-and-test.sh
       env:
         OS: ${{ runner.os }}
+
+    - name: Format
+      run: source .github/workflows/format-check.sh
+      env:
+        OS: ${{ runner.os }}
diff --git a/.github/workflows/format-check.sh b/.github/workflows/format-check.sh
new file mode 100755
index 0000000..20814bf
--- /dev/null
+++ b/.github/workflows/format-check.sh
@@ -0,0 +1,14 @@
+#! /bin/bash
+
+set -e
+
+source .github/workflows/common.sh
+
+##########################################################################
+
+start_section Formatting
+make format -j`nproc`
+test $(git status --porcelain | wc -l) -eq 0 || { git diff; false; }
+end_section
+
+##########################################################################
diff --git a/Makefile b/Makefile
index 1fe1c9e..0d54794 100644
--- a/Makefile
+++ b/Makefile
@@ -32,5 +32,5 @@
 
 CLANG_FORMAT ?= clang-format-5.0
 format:
-	find . -name \*.cc -print0 | xargs -0 -P $$(nproc) ${CLANG_FORMAT} -style=file -i
-	find . -name \*.h -print0 | xargs -0 -P $$(nproc) ${CLANG_FORMAT} -style=file -i
+	find . -name \*.cc -and -not -path './third_party/*' -print0 | xargs -0 -P $$(nproc) ${CLANG_FORMAT} -style=file -i
+	find . -name \*.h -and -not -path './third_party/*' -print0 | xargs -0 -P $$(nproc) ${CLANG_FORMAT} -style=file -i
diff --git a/sdc-plugin/.clang-format b/sdc-plugin/.clang-format
deleted file mode 100644
index 3b94352..0000000
--- a/sdc-plugin/.clang-format
+++ /dev/null
@@ -1,151 +0,0 @@
----
-Language:        Cpp
-BasedOnStyle:  Chromium
-AccessModifierOffset: -1
-AlignAfterOpenBracket: Align
-AlignConsecutiveAssignments: false
-AlignConsecutiveDeclarations: false
-AlignEscapedNewlines: Left
-AlignOperands:   true
-AlignTrailingComments: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowShortBlocksOnASingleLine: false
-AllowShortCaseLabelsOnASingleLine: false
-AllowShortFunctionsOnASingleLine: All
-AllowShortIfStatementsOnASingleLine: true
-AllowShortLoopsOnASingleLine: true
-AlwaysBreakAfterDefinitionReturnType: None
-AlwaysBreakAfterReturnType: None
-AlwaysBreakBeforeMultilineStrings: true
-AlwaysBreakTemplateDeclarations: Yes
-BinPackArguments: true
-BinPackParameters: true
-BraceWrapping:   
-  AfterClass:      false
-  AfterControlStatement: false
-  AfterEnum:       false
-  AfterFunction:   false
-  AfterNamespace:  false
-  AfterObjCDeclaration: false
-  AfterStruct:     false
-  AfterUnion:      false
-  AfterExternBlock: false
-  BeforeCatch:     false
-  BeforeElse:      false
-  IndentBraces:    false
-  SplitEmptyFunction: true
-  SplitEmptyRecord: true
-  SplitEmptyNamespace: true
-BreakBeforeBinaryOperators: None
-BreakBeforeBraces: Attach
-BreakBeforeInheritanceComma: false
-BreakInheritanceList: BeforeColon
-BreakBeforeTernaryOperators: true
-BreakConstructorInitializersBeforeComma: false
-BreakConstructorInitializers: BeforeColon
-BreakAfterJavaFieldAnnotations: false
-BreakStringLiterals: true
-ColumnLimit:     80
-CommentPragmas:  '^ IWYU pragma:'
-CompactNamespaces: false
-ConstructorInitializerAllOnOneLineOrOnePerLine: true
-ConstructorInitializerIndentWidth: 4
-ContinuationIndentWidth: 4
-Cpp11BracedListStyle: true
-DerivePointerAlignment: true
-DisableFormat:   false
-ExperimentalAutoDetectBinPacking: false
-FixNamespaceComments: true
-ForEachMacros:   
-  - foreach
-  - Q_FOREACH
-  - BOOST_FOREACH
-IncludeBlocks:   Preserve
-IncludeCategories: 
-  - Regex:           '^<ext/.*\.h>'
-    Priority:        2
-  - Regex:           '^<.*\.h>'
-    Priority:        1
-  - Regex:           '^<.*'
-    Priority:        2
-  - Regex:           '.*'
-    Priority:        3
-IncludeIsMainRegex: '([-_](test|unittest))?$'
-IndentCaseLabels: true
-IndentPPDirectives: None
-IndentWidth:     4
-IndentWrappedFunctionNames: false
-JavaScriptQuotes: Leave
-JavaScriptWrapImports: true
-KeepEmptyLinesAtTheStartOfBlocks: false
-MacroBlockBegin: ''
-MacroBlockEnd:   ''
-MaxEmptyLinesToKeep: 1
-NamespaceIndentation: None
-ObjCBinPackProtocolList: Never
-ObjCBlockIndentWidth: 2
-ObjCSpaceAfterProperty: false
-ObjCSpaceBeforeProtocolList: true
-PenaltyBreakAssignment: 2
-PenaltyBreakBeforeFirstCallParameter: 1
-PenaltyBreakComment: 300
-PenaltyBreakFirstLessLess: 120
-PenaltyBreakString: 1000
-PenaltyBreakTemplateDeclaration: 10
-PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 200
-PointerAlignment: Left
-RawStringFormats: 
-  - Language:        Cpp
-    Delimiters:      
-      - cc
-      - CC
-      - cpp
-      - Cpp
-      - CPP
-      - 'c++'
-      - 'C++'
-    CanonicalDelimiter: ''
-    BasedOnStyle:    google
-  - Language:        TextProto
-    Delimiters:      
-      - pb
-      - PB
-      - proto
-      - PROTO
-    EnclosingFunctions: 
-      - EqualsProto
-      - EquivToProto
-      - PARSE_PARTIAL_TEXT_PROTO
-      - PARSE_TEST_PROTO
-      - PARSE_TEXT_PROTO
-      - ParseTextOrDie
-      - ParseTextProtoOrDie
-    CanonicalDelimiter: ''
-    BasedOnStyle:    google
-ReflowComments:  true
-SortIncludes:    true
-SortUsingDeclarations: true
-SpaceAfterCStyleCast: false
-SpaceAfterTemplateKeyword: true
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeCpp11BracedList: false
-SpaceBeforeCtorInitializerColon: true
-SpaceBeforeInheritanceColon: true
-SpaceBeforeParens: ControlStatements
-SpaceBeforeRangeBasedForLoopColon: true
-SpaceInEmptyParentheses: false
-SpacesBeforeTrailingComments: 2
-SpacesInAngles:  false
-SpacesInContainerLiterals: true
-SpacesInCStyleCastParentheses: false
-SpacesInParentheses: false
-SpacesInSquareBrackets: false
-Standard:        Auto
-StatementMacros: 
-  - Q_UNUSED
-  - QT_REQUIRE_VERSION
-TabWidth:        8
-UseTab: ForIndentation
-...
-