distinguish object files built from multiple sources with the same base name but different extensions - close #113

build_tests/multiple_basename/Rsconscript

@@ -0,0 +1,5 @@
+build do
+  Environment.new do |env|
+    env.Program("foo.exe", glob("*.cc", "*.c"))
+  end
+end

build_tests/multiple_basename/foo.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+void foo(void)
+{
+    printf("foo\n");
+}

build_tests/multiple_basename/foo.cc

@@ -0,0 +1,12 @@
+#include <iostream>
+
+extern "C" {
+    void foo(void);
+}
+
+int main(int argc, char * argv[])
+{
+    foo();
+    std::cout << "main" << std::endl;
+    return 0;
+}