test:compile: Add more tests.

Author: lkorenc

test/vast/Compile/SingleSource/global-a.c

@@ -0,0 +1,8 @@
+// RUN: vast-front -o %t %s && (%t 1 2 3; test $? -eq 5)
+
+int x = 5;
+
+int main(int argc, char **argv)
+{
+    return x;
+}

test/vast/Compile/SingleSource/putchar-a.c

@@ -0,0 +1,12 @@
+// RUN: vast-front -o %t %s && %t | FileCheck %s
+
+int putchar(int);
+
+int main()
+{
+    // CHECK: a
+    putchar('a');
+    putchar('\n');
+    // Workaround as `vast-front` and `vast-cc` behave differently.
+    return 0;
+}

test/vast/Compile/SingleSource/puts-a.c

@@ -0,0 +1,17 @@
+// RUN: vast-front -o %t %s && %t hello | FileCheck %s
+
+int puts(const char *);
+
+int main(int argc, char **argv)
+{
+    if (argc < 1)
+    {
+        puts("Nothing");
+        return 0;
+    }
+
+    // CHECK: hello
+    puts(argv[1]);
+    // Workaround as `vast-front` and `vast-cc` behave differently.
+    return 0;
+}