gendef(1) DLL export extractor


gendef [options] <DLL>


gendef dumps DLL export information from 32- and 64-bit Windows executables (respectively PE32 and PE32+ executables).


Dump to stdout
-h, --help
Briefly describe the syntax and options.
-a, --assume-stdcall
Assume functions with ambiguous calling conventions use stdcall.
-I, --include-def-path <path>
Add additional search paths in which to look for hint .def files.
-f, --no-forward-output
Don't output forwarders.


By default gendef writes the DLL export information to a file named after the DLL, replacing .dll with .def.


For 32-bit DLLs, gendef cannot detect if a function with no return value (void) exported by a DLL uses stdcall or cdecl. Two workarounds are available: either use the "-a" option to force stdcall calling conventions, or generate .def files for any DLLs the DLL you're interested in depends upon. gendef will read other .def files found in the working directory to determine the calling convention in use.

64-bit DLLs are not affected, since they only use a single calling convention.


gendef was written by Kai Tietz and Jonathan Yong of the MinGW-w64 project.

This manual page was written by Stephen Kitt <[email protected]>, based on information provided with the program and in the project's wiki, for the Debian GNU/Linux system (but may be used by others).