Fix build with Boost 1.77.0

BOOST_FILESYSTEM_C_STR changed to accept the path as an argument

src/fs.cpp

@@ -242,7 +242,11 @@ void ofstream::close()
 }
 #else // __GLIBCXX__
 
+#if BOOST_VERSION >= 107700
+static_assert(sizeof(*BOOST_FILESYSTEM_C_STR(fs::path())) == sizeof(wchar_t),
+#else
 static_assert(sizeof(*fs::path().BOOST_FILESYSTEM_C_STR) == sizeof(wchar_t),
+#endif // BOOST_VERSION >= 107700
  "Warning: This build is using boost::filesystem ofstream and ifstream "
  "implementations which will fail to open paths containing multibyte "
  "characters. You should delete this static_assert to ignore this warning, "

src/wallet/test/db_tests.cpp

@@ -25,7 +25,11 @@ BOOST_AUTO_TEST_CASE(getwalletenv_file)
  std::string test_name = "test_name.dat";
  const fs::path datadir = gArgs.GetDataDirNet();
  fs::path file_path = datadir / test_name;
+#if BOOST_VERSION >= 107700
+ std::ofstream f(BOOST_FILESYSTEM_C_STR(file_path));
+#else
  std::ofstream f(file_path.BOOST_FILESYSTEM_C_STR);
+#endif // BOOST_VERSION >= 107700
  f.close();
 
  std::string filename;

src/wallet/test/init_test_fixture.cpp

@@ -32,7 +32,11 @@ InitWalletDirTestingSetup::InitWalletDirTestingSetup(const std::string& chainNam
  fs::create_directories(m_walletdir_path_cases["default"]);
  fs::create_directories(m_walletdir_path_cases["custom"]);
  fs::create_directories(m_walletdir_path_cases["relative"]);
+#if BOOST_VERSION >= 107700
+ std::ofstream f(BOOST_FILESYSTEM_C_STR(m_walletdir_path_cases["file"]));
+#else
  std::ofstream f(m_walletdir_path_cases["file"].BOOST_FILESYSTEM_C_STR);
+#endif // BOOST_VERSION >= 107700
  f.close();
 }