CMake: add one more test for no_direct_extern_access

Found while compiling qtdeclarative tests:

FAILED: qtdeclarative/tests/auto/qml/qmlcppcodegen/tst_qmlcppcodegen
[...]
ld: qtdeclarative/tests/auto/qml/qmlcppcodegen/data/TestTypes/libcodegen_test_moduleplugin.a(codegen_test_moduleplugin_TestTypesPlugin.cpp.o): non-canonical reference to canonical protected function `_Z28qml_register_types_TestTypesv' in qtdeclarative/tests/auto/qml/qmlcppcodegen/data/libcodegen_test_module.a(codegen_test_module_qmltyperegistrations.cpp.o)
ld: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

See https://sourceware.org/bugzilla/show_bug.cgi?id=29377

Pick-to: 6.4
Change-Id: I3859764fed084846bcb0fffd1702fe6da341a9e3
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

3 files changed, 19 insertions, 2 deletions

diff --git a/config.tests/no_direct_extern_access/CMakeLists.txt b/config.tests/no_direct_extern_access/CMakeLists.txt
index 7c82348751..b4b881f1dc 100644
--- a/config.tests/no_direct_extern_access/CMakeLists.txt
+++ b/config.tests/no_direct_extern_access/CMakeLists.txt
@@ -2,9 +2,10 @@ cmake_minimum_required(VERSION 3.16)
 project(direct_extern_access LANGUAGES CXX)
 
 # this is the test found in https://sourceware.org/bugzilla/show_bug.cgi?id=29087
+# and https://sourceware.org/bugzilla/show_bug.cgi?id=29377
 
 add_library(no_extern_access_lib SHARED lib.cpp)
-add_executable(no_extern_access_main main.cpp)
+add_executable(no_extern_access_main other.cpp main.cpp)
 
 target_compile_options(no_extern_access_lib PRIVATE "-Werror")
 target_compile_options(no_extern_access_lib PUBLIC "$<$<CXX_COMPILER_ID:GNU>:-mno-direct-extern-access>")
diff --git a/config.tests/no_direct_extern_access/main.cpp b/config.tests/no_direct_extern_access/main.cpp
index 9cf0323766..541c8b4b33 100644
--- a/config.tests/no_direct_extern_access/main.cpp
+++ b/config.tests/no_direct_extern_access/main.cpp
@@ -1,10 +1,18 @@
 // Copyright (C) 2022 Intel Corporation.
 // SPDX-License-Identifier: MIT
 
-// This is the test found in https://sourceware.org/bugzilla/show_bug.cgi?id=29087
+// This is combining the tests found in:
+// https://sourceware.org/bugzilla/show_bug.cgi?id=29087
+// https://sourceware.org/bugzilla/show_bug.cgi?id=29377
 
 #include "lib.h"
 
+extern void foo(); // other.cpp
+void (*get_foo())()
+{
+    return foo;
+}
+
 struct Local : S { };
 int main()
 {
diff --git a/config.tests/no_direct_extern_access/other.cpp b/config.tests/no_direct_extern_access/other.cpp
new file mode 100644
index 0000000000..ff12b10930
--- /dev/null
+++ b/config.tests/no_direct_extern_access/other.cpp
@@ -0,0 +1,8 @@
+// Copyright (C) 2022 Intel Corporation.
+// SPDX-License-Identifier: MIT
+
+// This is the test found in https://sourceware.org/bugzilla/show_bug.cgi?id=29377
+
+__attribute__((visibility("protected"))) void foo()
+{
+}