improve an error message when a file cannot be open

diff --git a/src/surf/xml/surfxml_sax_cb.cpp b/src/surf/xml/surfxml_sax_cb.cpp
index 1b920ef..9b294a4 100644 (file)
--- a/src/surf/xml/surfxml_sax_cb.cpp
+++ b/src/surf/xml/surfxml_sax_cb.cpp
@@ -968,10 +968,11 @@ void surf_parse_open(std::string file)
   surf_parsed_filename = file;
   std::string dir      = simgrid::xbt::Path(file).get_dir_name();
   surf_path.push_back(dir);
+  std::string cwd = simgrid::xbt::Path().get_dir_name();
 
   surf_file_to_parse = surf_fopen(file, "r");
   if (surf_file_to_parse == nullptr)
-    xbt_die("Unable to open '%s'\n", file.c_str());
+    xbt_die("Unable to open '%s' from '%s'\n", file.c_str(), cwd.c_str());
   surf_input_buffer = surf_parse__create_buffer(surf_file_to_parse, YY_BUF_SIZE);
   surf_parse__switch_to_buffer(surf_input_buffer);
   surf_parse_lineno = 1;