C++: Tests for cc_binary linking shared libraries

This is guarded behind the --experimental_cc_shared_library flag

PiperOrigin-RevId: 283982821
Change-Id: Ifec330c01d7b480b641f8432ce94175291e79238

examples/experimental_cc_shared_library.bzl

@@ -227,7 +227,6 @@ def _cc_shared_library_impl(ctx):
     additional_inputs = []
     if ctx.file.visibility_file != None:
         user_link_flags = [
-            "-Wl,--no-undefined",  # Just here for testing.
             "-Wl,--version-script=" + ctx.file.visibility_file.path,
         ]
         additional_inputs = [ctx.file.visibility_file]

examples/test_cc_shared_library/BUILD

@@ -1,9 +1,17 @@
-load("//cc:defs.bzl", "cc_library")
+load("//cc:defs.bzl", "cc_binary", "cc_library")
 load("//examples:experimental_cc_shared_library.bzl", "cc_shared_library")
 
+cc_binary(
+    name = "binary",
+    srcs = ["main.cc"],
+    dynamic_deps = ["foo_so"],
+    deps = ["foo"],
+)
+
 cc_shared_library(
     name = "foo_so",
     dynamic_deps = ["bar_so"],
+    preloaded_deps = ["preloaded_dep"],
     visibility_file = "foo.lds",
     exports = [
         "foo",
@@ -25,11 +33,19 @@ cc_shared_library(
     ],
 )
 
+cc_library(
+    name = "preloaded_dep",
+    srcs = ["preloaded_dep.cc"],
+    hdrs = ["preloaded_dep.h"],
+)
+
 cc_library(
     name = "foo",
     srcs = ["foo.cc"],
+    hdrs = ["foo.h"],
     linked_statically_by = ["//examples/test_cc_shared_library:foo_so"],
     deps = [
+        "preloaded_dep",
         "bar",
         "baz",
         # Not exported.
@@ -40,12 +56,14 @@ cc_library(
 cc_library(
     name = "baz",
     srcs = ["baz.cc"],
+    hdrs = ["baz.h"],
     linked_statically_by = ["//examples/test_cc_shared_library:foo_so"],
 )
 
 cc_library(
     name = "qux",
     srcs = ["qux.cc"],
+    hdrs = ["qux.h"],
     linked_statically_by = ["//examples/test_cc_shared_library:foo_so"],
 )
 
@@ -70,6 +88,7 @@ cc_library(
 cc_library(
     name = "bar2",
     srcs = ["bar2.cc"],
+    hdrs = ["bar2.h"],
     linked_statically_by = [
         "//examples/test_cc_shared_library:bar_so",
         "//examples/test_cc_shared_library:foo_so",
@@ -79,6 +98,7 @@ cc_library(
 cc_library(
     name = "bar3",
     srcs = ["bar3.cc"],
+    hdrs = ["bar3.h"],
     linked_statically_by = [
         "//examples/test_cc_shared_library:bar_so",
         "//examples/test_cc_shared_library:foo_so",
@@ -88,6 +108,7 @@ cc_library(
 cc_library(
     name = "bar4",
     srcs = ["bar4.cc"],
+    hdrs = ["bar4.h"],
     linked_statically_by = [
         "//examples/test_cc_shared_library:bar_so",
         "//examples/test_cc_shared_library:foo_so",
@@ -99,6 +120,7 @@ sh_test(
     srcs = ["cc_shared_library_integration_test.sh"],
     data = [
         ":bar_so",
+        ":binary",
         ":foo_so",
     ],
 )

examples/test_cc_shared_library/bar2.cc

@@ -1 +1,3 @@
+#include "examples/test_cc_shared_library/bar2.h"
+
 int bar2() { return 42; }

examples/test_cc_shared_library/bar2.h

@@ -0,0 +1,6 @@
+#ifndef EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_2_H_
+#define EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_2_H_
+
+int bar2();
+
+#endif  // EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_2_H_

examples/test_cc_shared_library/bar3.cc

@@ -1 +1,3 @@
+#include "examples/test_cc_shared_library/bar3.h"
+
 int bar3() { return 42; }

examples/test_cc_shared_library/bar3.h

@@ -0,0 +1,6 @@
+#ifndef EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_3_H_
+#define EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_3_H_
+
+int bar3();
+
+#endif  // EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_3_H_

examples/test_cc_shared_library/bar4.cc

@@ -1 +1,3 @@
+#include "examples/test_cc_shared_library/bar4.h"
+
 int bar4() { return 42; }

examples/test_cc_shared_library/bar4.h

@@ -0,0 +1,6 @@
+#ifndef EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_4_H_
+#define EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_4_H_
+
+int bar4();
+
+#endif  // EXAMPLES_TEST_CC_SHARED_LIBRARY_BAR_4_H_

examples/test_cc_shared_library/baz.cc

@@ -1 +1,3 @@
+#include "examples/test_cc_shared_library/baz.h"
+
 int baz() { return 42; }

examples/test_cc_shared_library/baz.h

@@ -0,0 +1,6 @@
+#ifndef EXAMPLES_TEST_CC_SHARED_LIBRARY_BAZ_H_
+#define EXAMPLES_TEST_CC_SHARED_LIBRARY_BAZ_H_
+
+int baz();
+
+#endif  // EXAMPLES_TEST_CC_SHARED_LIBRARY_BAZ_H_

examples/test_cc_shared_library/cc_shared_library_integration_test.sh

@@ -29,18 +29,27 @@ function check_symbol_absent() {
   fi
 }
 
-function test_output {
+function test_shared_library_symbols() {
   foo_so=$(find . -name libfoo_so.so)
   symbols=$(nm -D $foo_so)
   check_symbol_present "$symbols" "U _Z3barv"
   check_symbol_present "$symbols" "T _Z3bazv"
   check_symbol_present "$symbols" "T _Z3foov"
+  # Check that the preloaded dep symbol is not present
+  check_symbol_present "$symbols" "U _Z13preloaded_depv"
 
   check_symbol_absent "$symbols" "_Z3quxv"
   check_symbol_absent "$symbols" "_Z4bar3v"
   check_symbol_absent "$symbols" "_Z4bar4v"
+}
 
-  exit 0
+function test_binary() {
+  binary=$(find . -name binary)
+  symbols=$(nm -D $binary)
+  check_symbol_present "$symbols" "T _Z13preloaded_depv"
+  check_symbol_present "$symbols" "U _Z3foov"
+  $binary | (grep -q "hello 42" || (echo "Expected 'hello 42'" && exit 1))
 }
 
-test_output
+test_shared_library_symbols
+test_binary

examples/test_cc_shared_library/foo.cc

@@ -1,6 +1,12 @@
 #include "examples/test_cc_shared_library/bar.h"
+#include "examples/test_cc_shared_library/baz.h"
+#include "examples/test_cc_shared_library/preloaded_dep.h"
+#include "examples/test_cc_shared_library/qux.h"
 
 int foo() {
   bar();
+  baz();
+  qux();
+  preloaded_dep();
   return 42;
 }

examples/test_cc_shared_library/foo.h

@@ -0,0 +1,6 @@
+#ifndef EXAMPLES_TEST_CC_SHARED_LIBRARY_FOO_H_
+#define EXAMPLES_TEST_CC_SHARED_LIBRARY_FOO_H_
+
+int foo();
+
+#endif  // EXAMPLES_TEST_CC_SHARED_LIBRARY_FOO_H_

examples/test_cc_shared_library/main.cc

@@ -0,0 +1,8 @@
+#include <iostream>
+
+#include "examples/test_cc_shared_library/foo.h"
+
+int main() {
+  std::cout << "hello " << foo() << std::endl;
+  return 0;
+}

examples/test_cc_shared_library/preloaded_dep.cc

@@ -0,0 +1,3 @@
+#include "examples/test_cc_shared_library/preloaded_dep.h"
+
+int preloaded_dep() { return 42; }

examples/test_cc_shared_library/preloaded_dep.h

@@ -0,0 +1,6 @@
+#ifndef EXAMPLES_TEST_CC_SHARED_LIBRARY_PRELOADED_DEP_H_
+#define EXAMPLES_TEST_CC_SHARED_LIBRARY_PRELOADED_DEP_H_
+
+int preloaded_dep();
+
+#endif  // EXAMPLES_TEST_CC_SHARED_LIBRARY_PRELOADED_DEP_H_

examples/test_cc_shared_library/qux.cc

@@ -1 +1,3 @@
+#include "examples/test_cc_shared_library/qux.h"
+
 int qux() { return 42; }

examples/test_cc_shared_library/qux.h

@@ -0,0 +1,6 @@
+#ifndef EXAMPLES_TEST_CC_SHARED_LIBRARY_QUX_H_
+#define EXAMPLES_TEST_CC_SHARED_LIBRARY_QUX_H_
+
+int qux();
+
+#endif  // EXAMPLES_TEST_CC_SHARED_LIBRARY_QUX_H_