add runtime-cc (#19)

runtime-cc/.gitignore

@@ -0,0 +1,2 @@
+# product
+build

runtime-cc/makefile

@@ -0,0 +1,15 @@
+# Makefile for runtime-cc
+
+B = build
+S = src
+
+CC = clang++
+CFLAGS = -std=c++20
+CFLAGS += -Wall -O2 -D_GNU_SOURCE
+
+RUNTIME	= $B/runtime
+RUNTIME_SRC = $(shell echo $S/*.cc)
+
+$(RUNTIME): $(RUNTIME_SRC)
+	@if [ ! -d $B ]; then mkdir $B; fi
+	$(CC) $(CFLAGS) $(RUNTIME_SRC) -o $(RUNTIME)

runtime-cc/src/main.cc

@@ -0,0 +1,5 @@
+#include <iostream>
+
+int main() {
+  std::cout << "Execute C++ runtime..." << std::endl;
+}