Test in freestanding environment

.github/workflows/test.yml

@@ -31,3 +31,24 @@ jobs:
         run: make
       - name: check
         run: make check
+      - name: install
+        run: sudo make install
+
+  freestanding:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        cc: ['gcc', 'clang', 'tcc']
+        assert: ['--enable-assert', '--disable-assert']
+    steps:
+      - uses: actions/checkout@v2
+      - name: dependencies
+        run: sudo apt install clang tcc
+      - name: autogen
+        run: ./autogen.sh
+      - name: configure
+        run: ./configure ${{matrix.assert}} CC='${{matrix.cc}}' CFLAGS='-ffreestanding -nostdlib -fno-builtin -fno-stack-protector'
+      - name: make
+        run: make libkernaux.a
+      - name: install
+        run: sudo make install-exec install-data