diff --git a/.appveyor.yml b/.appveyor.yml
index 1477d74..d7de4c5 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,7 +1,7 @@
 version: "{build}"
 branches:
   except:
-    - /^(wip\/)?(travis|osx)(\-.+)?$/
+    - /^(wip\/)?(travis|osx|gha)(\-.+)?$/
 
 environment:
   matrix:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..453fea2
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,39 @@
+on:
+  push:
+    branches-ignore:
+      - 'ci/**'
+      - '!ci/gha**'
+      - 'dependabot/**'
+  pull_request:
+    branches:
+      - 'master'
+
+jobs:
+  pelles:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        version:
+          - "12.0.2"
+          # - "11.0.2"
+          # - "10.0.6"
+          # - "9.00.0.0"
+          # - "8.00.0.0"
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Pelles
+        uses: crazy-max/ghaction-chocolatey@v3
+        with:
+          args: install pelles-c --version "${{ matrix.version }}"
+      - name: Install Make
+        uses: crazy-max/ghaction-chocolatey@v3
+        with:
+          args: install make
+      - name: Tmp
+        run: dir 'C:\ProgramData\chocolatey\lib\make\tools\install\bin'
+      - name: Compile
+        env:
+          POCC: 'C:\Program Files\PellesC\bin\pocc.exe'
+          POLINK: 'C:\Program Files\PellesC\bin\polink.exe'
+        working-directory: test
+        run: make -f Makefile.pelles
diff --git a/test/Makefile b/test/Makefile
index d00426e..c72d184 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -249,12 +249,12 @@ Makefile.icl: Makefile
 
 Makefile.pelles: Makefile
 	@echo -e "# Generated by Makefile. Do not edit.\r" > $@
-	@echo -e "CC = pocc\r" >> $@
-	@echo -e "LD = polink\r" >> $@
+	@echo -e "CC ?= pocc\r" >> $@
+	@echo -e "LD ?= polink\r" >> $@
 	@echo -e "\r" >> $@
 
-	@echo -e "CFLAGS = \r" >> $@
-	@echo -e "LDFLAGS = \r" >> $@
+	@echo -e "CFLAGS ?= \r" >> $@
+	@echo -e "LDFLAGS ?= \r" >> $@
 	@echo -e "\r" >> $@
 
 	@echo -e "TESTS = \x5c\r" >> $@
diff --git a/test/Makefile.pelles b/test/Makefile.pelles
index 0ecd1ae..2df9f28 100644
--- a/test/Makefile.pelles
+++ b/test/Makefile.pelles
@@ -1,17 +1,19 @@
 # Generated by Makefile. Do not edit.
-CC = pocc
-LD = polink
+CC ?= pocc
+LD ?= polink
 
-CFLAGS = 
-LDFLAGS = 
+CFLAGS ?= 
+LDFLAGS ?= 
 
 TESTS = \
 	array-param.exe \
 	assume.exe \
 	cast.exe \
+	concat.exe \
 	const.exe \
 	constant.exe \
 	deprecated.exe \
+	empty-bases.exe \
 	fallthrough.exe \
 	flags.exe \
 	inline.exe \
@@ -19,6 +21,7 @@ TESTS = \
 	malloc.exe \
 	message.exe \
 	noinline.exe \
+	no-escape.exe \
 	no-return.exe \
 	non-null.exe \
 	predict.exe \
@@ -30,9 +33,11 @@ TESTS = \
 	sentinel.exe \
 	static-assert.exe \
 	stringify.exe \
+	unknown-cpp-attributes.exe \
 	unknown-pragmas.exe \
 	unavailable.exe \
 	unreachable.exe \
+	unused-function.exe \
 	visibility.exe \
 	warn.exe \
 	warn-unused-result.exe \
@@ -42,9 +47,11 @@ CLEANFILES = $(TESTS) \
 	array-param.obj array-param.exe \
 	assume.obj assume.exe \
 	cast.obj cast.exe \
+	concat.obj concat.exe \
 	const.obj const.exe \
 	constant.obj constant.exe \
 	deprecated.obj deprecated.exe \
+	empty-bases.obj empty-bases.exe \
 	fallthrough.obj fallthrough.exe \
 	flags.obj flags.exe \
 	inline.obj inline.exe \
@@ -52,6 +59,7 @@ CLEANFILES = $(TESTS) \
 	malloc.obj malloc.exe \
 	message.obj message.exe \
 	noinline.obj noinline.exe \
+	no-escape.obj no-escape.exe \
 	no-return.obj no-return.exe \
 	non-null.obj non-null.exe \
 	predict.obj predict.exe \
@@ -63,9 +71,11 @@ CLEANFILES = $(TESTS) \
 	sentinel.obj sentinel.exe \
 	static-assert.obj static-assert.exe \
 	stringify.obj stringify.exe \
+	unknown-cpp-attributes.obj unknown-cpp-attributes.exe \
 	unknown-pragmas.obj unknown-pragmas.exe \
 	unavailable.obj unavailable.exe \
 	unreachable.obj unreachable.exe \
+	unused-function.obj unused-function.exe \
 	visibility.obj visibility.exe \
 	warn.obj warn.exe \
 	warn-unused-result.obj warn-unused-result.exe \
@@ -94,6 +104,12 @@ cast.obj: cast.c
 cast.exe: cast.obj
 	$(LD) $(LDFLAGS) /OUT:cast.exe cast.obj
 
+concat.obj: concat.c
+	$(CC) $(CFLAGS) concat.c
+
+concat.exe: concat.obj
+	$(LD) $(LDFLAGS) /OUT:concat.exe concat.obj
+
 const.obj: const.c
 	$(CC) $(CFLAGS) const.c
 
@@ -112,6 +128,12 @@ deprecated.obj: deprecated.c
 deprecated.exe: deprecated.obj
 	$(LD) $(LDFLAGS) /OUT:deprecated.exe deprecated.obj
 
+empty-bases.obj: empty-bases.c
+	$(CC) $(CFLAGS) empty-bases.c
+
+empty-bases.exe: empty-bases.obj
+	$(LD) $(LDFLAGS) /OUT:empty-bases.exe empty-bases.obj
+
 fallthrough.obj: fallthrough.c
 	$(CC) $(CFLAGS) fallthrough.c
 
@@ -154,6 +176,12 @@ noinline.obj: noinline.c
 noinline.exe: noinline.obj
 	$(LD) $(LDFLAGS) /OUT:noinline.exe noinline.obj
 
+no-escape.obj: no-escape.c
+	$(CC) $(CFLAGS) no-escape.c
+
+no-escape.exe: no-escape.obj
+	$(LD) $(LDFLAGS) /OUT:no-escape.exe no-escape.obj
+
 no-return.obj: no-return.c
 	$(CC) $(CFLAGS) no-return.c
 
@@ -220,6 +248,12 @@ stringify.obj: stringify.c
 stringify.exe: stringify.obj
 	$(LD) $(LDFLAGS) /OUT:stringify.exe stringify.obj
 
+unknown-cpp-attributes.obj: unknown-cpp-attributes.c
+	$(CC) $(CFLAGS) unknown-cpp-attributes.c
+
+unknown-cpp-attributes.exe: unknown-cpp-attributes.obj
+	$(LD) $(LDFLAGS) /OUT:unknown-cpp-attributes.exe unknown-cpp-attributes.obj
+
 unknown-pragmas.obj: unknown-pragmas.c
 	$(CC) $(CFLAGS) unknown-pragmas.c
 
@@ -238,6 +272,12 @@ unreachable.obj: unreachable.c
 unreachable.exe: unreachable.obj
 	$(LD) $(LDFLAGS) /OUT:unreachable.exe unreachable.obj
 
+unused-function.obj: unused-function.c
+	$(CC) $(CFLAGS) unused-function.c
+
+unused-function.exe: unused-function.obj
+	$(LD) $(LDFLAGS) /OUT:unused-function.exe unused-function.obj
+
 visibility.obj: visibility.c
 	$(CC) $(CFLAGS) visibility.c