Add another test file from #43

tests/testdata/cpp/simple/.gitignore

@@ -1 +1,2 @@
 simple
+variables

tests/testdata/cpp/simple/Makefile

@@ -1,7 +1,11 @@
-CXXFLAGS=-g -O0
+CXXFLAGS=-g -O0 -std=c++17
 
-simple: simple.cpp
+.PHONY: all
+
+TARGETS=simple variables
+
+all: $(TARGETS)
 
 clean:
-	rm -f simple
-	rm -rf simple.dSYM
+	rm -f $(TARGETS)
+	rm -rf $(TARGETS:%=%.dSYM)

tests/testdata/cpp/simple/variables.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+
+int main() {
+    std::cout << "Hello world!" << std::endl;
+    int a = 1;
+    ++a;
+    int& b = a;
+    ++a;
+    std::cout << "a: " << a << " b: " << b << std::endl;
+    return 0;
+}