Add basic test example

Author: keith

tcmalloc/BUILD

@@ -119,8 +119,9 @@ cc_library(
 
 cc_static_library(
     name = "tcmalloc_standalone",
-    deps = [":tcmalloc"],
     tags = ["manual"],
+    visibility = [":__subpackages__"],
+    deps = [":tcmalloc"],
 )
 
 cc_library(

tcmalloc/testing/BUILD

@@ -1053,3 +1053,24 @@ cc_test(
         "//tcmalloc:alloc_at_least",
     ],
 )
+
+cc_import(
+    name = "standalone_import",
+    static_library = "//tcmalloc:tcmalloc_standalone",
+    tags = ["manual"],  # TODO: Remove once cc_static_library is always enabled
+    alwayslink = True,
+)
+
+cc_test(
+    name = "standalone_test",
+    srcs = ["standalone_test.cc"],
+    tags = [
+        "manual",  # TODO: Remove once cc_static_library is always enabled
+        "noasan",
+        "nomsan",
+        "notsan",
+    ],
+    deps = [
+        ":standalone_import",
+    ],
+)

tcmalloc/testing/standalone_test.cc

@@ -0,0 +1,17 @@
+#include <iostream>
+#include <cstddef>
+
+int main() {
+  std::cout << "Standard Alignment: " << alignof(std::max_align_t) << '\n';
+
+  double *ptr = (double*) malloc(sizeof(double));
+  std::cout << "Double Alignment: " << alignof(*ptr) << '\n';
+
+  char *ptr2 = (char*) malloc(1);
+  std::cout << "Char Alignment: " << alignof(*ptr2) << '\n';
+
+  void *ptr3;
+  std::cout << "Sizeof void*: " << sizeof(ptr3) << '\n';
+
+  return 0;
+}