Warn, if a symbol is exported by more than a single ELF file

generatecypher.py

@@ -302,6 +302,7 @@ def createoutput(outputdir, outputformat, machine_to_binary, linked_libraries,
                         outputfileopen.write("\n</nodes>")
                         outputfileopen.write("\n<edges>")
 
+                    exported_symbols_to_elf = {}
                     # then declare for all the symbols which are exported
                     for filename in machine_to_binary[architecture][o][endian][elfclass]:
                         if notarget(filename, limitsearch):
@@ -340,6 +341,9 @@ def createoutput(outputdir, outputformat, machine_to_binary, linked_libraries,
                             elif outputformat == 'text':
                                 outputfileopen.write("%s EXPORTS %s" % (filename, exp['name']))
                             exportedsymbols += 1
+                            if exp['name'] not in exported_symbols_to_elf:
+                                exported_symbols_to_elf[exp['name']] = []
+                            exported_symbols_to_elf[exp['name']].append(filename)
                         if exportedsymbols == 0 and targets != [] and filename not in targets:
                             files_without_exports.add(filename)
                             for l in linked_libraries[filename]:
@@ -350,6 +354,10 @@ def createoutput(outputdir, outputformat, machine_to_binary, linked_libraries,
                                         if otherfilename not in files_without_exports:
                                             files_without_exports.add(otherfilename)
 
+                    for symbol in exported_symbols_to_elf:
+                        if len(exported_symbols_to_elf[symbol]) > 1:
+                            print("Warning: Symbol '%s' found more than once in %s" % (symbol, exported_symbols_to_elf[symbol]))
+
                     if files_without_exports != set():
                         print("Warning: Linked but unused files %s found and marked as such" % (files_without_exports))