tests: Extend cmake test with -Wl,--version-script

This tests that CMake link flags marked as PRIVATE are not propagated
through the generated Meson dependency. -Wl,--version-script is used as
the "poison" here, the build ultimately fails if it appears in the
shared_library() link command.

test cases/cmake/2 advanced/main3.cpp

@@ -0,0 +1,6 @@
+extern void slib();
+
+int main() {
+  slib();
+  return 0;
+}

test cases/cmake/2 advanced/meson.build

@@ -15,6 +15,8 @@ sub_sta = sub_pro.dependency('cmModLibStatic')
 # Build some files
 exe1 = executable('main1', ['main.cpp'], dependencies: [sub_dep])
 exe2 = executable('main2', ['main.cpp'], dependencies: [sub_sta])
+slib = shared_library('slib', ['slib.cpp'], dependencies: [sub_dep])
+exe3 = executable('main3', ['main3.cpp'], link_with: slib)
 test('test1', exe1)
 test('test2', exe2)
 

test cases/cmake/2 advanced/slib.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+#include <cmMod.hpp>
+#include "config.h"
+
+#if CONFIG_OPT != 42
+#error "Invalid value of CONFIG_OPT"
+#endif
+
+using namespace std;
+
+void slib(void) {
+  cmModClass obj("Hello from lib");
+  cout << obj.getStr() << endl;
+}

test cases/cmake/2 advanced/subprojects/cmMod/CMakeLists.txt

@@ -17,6 +17,13 @@ generate_export_header(cmModLib)
 
 set_target_properties(cmModLib PROPERTIES VERSION 1.0.1)
 
+include(CheckLinkerFlag)
+check_linker_flag(CXX "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/vers.map" HAS_VER_SCRIPT)
+if(HAS_VER_SCRIPT)
+  target_link_options(cmModLib PRIVATE
+    "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/vers.map")
+endif()
+
 add_executable(testEXE main.cpp "${CMAKE_CURRENT_BINARY_DIR}/config.h")
 
 target_link_libraries(cmModLib       ZLIB::ZLIB)

test cases/cmake/2 advanced/subprojects/cmMod/vers.map

@@ -0,0 +1,7 @@
+{
+  global:
+    extern "C++" {
+      cmModClass::*;
+    };
+  local: *;
+};