gendef和pexports

gendef 和 pexports

gendef和pexports都可以从DLL和对应头文件中提取信息，创建相应的.def文件以列出每个DLL中可用的符号。然后，你可以用dlltool（binutils）通过.def文件来生成对应的导入库（import library），这样就可以解决DLL开发商未提供所需开发平台导入库的问题。

安装

gendef和pexports可以通过MinGW（32-bit）安装管理器安装：


也可以通过上图中给出的链接直接下载。
由于它们只能通过“All Packages”分类才能选中下载，其下的子项中都没有列出，非常隐蔽。
在MSYS2/MinGW-w64环境下查询和安装gendef的命令：

pacman -Fy
pacman -F gendef.exe
pacman -S --needed mingw-w64-x86_64-tools-git
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软件描述

gendef can extract information from DLLs to create corresponding .def files that list the symbols available in each DLL. .def files can then be used by dlltool (mingw32-binutils) to generate import libraries. gendef is similar to pexports, but the two tools differ in how each determines the “decoration” (or calling convention) appropriate for each symbol, since that information is not always available directly from the DLL’s symbol table. gendef locates the symbol’s code in the DLL, and uses a disassembler to determine that information. pexports can use a C pre-processor to extract the information, provided you have the appropriate header files. Neither method is foolproof, so both tools are provided.
gendef was written by the MinGW64 team. It can extract symbols from 32bit or 64bit EXEs or DLLs. It can automatically detect stdcall, fastcall, and cdecl calling conventions and generate the correctly decorated function names, without requiring the header files or a C pre-processor.

pexports can extract information from DLLs to create corresponding .def files that list the symbols available in each DLL. .def files can then be used by dlltool (mingw32-binutils) to generate import libraries. pexports is similar to gendef, but the two tools differ in how each determines the “decoration” (or calling convention) appropriate for each symbol, since that information is not always available directly from the DLL’s symbol table. pexports can use a C pre-processor to extract the information, provided you have the appropriate header files. gendef locates the symbol’s code in the DLL, and uses a disassembler to determine that information. Neither method is foolproof, so both tools are provided.
Note that in order for pexports to detect the calling convention, you must specify on the command line the headers to parse. If the symbols are not declared in those headers, then the proper decorations cannot be computed. Originally written by Anders Norlander, it now supports both 32bit and 64bit DLLs and EXEs thanks to Tor Lillqvist.

例子

gendef steam_api64.dll
dlltool -D steam_api64.dll -d steam_api64.def -l libsteam_api64.a
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第一步生成steam_api64.def。
第二步如果缺少"-d steam_api64.def"，在链接 libsteam_api64.a 时就会出现“undefined reference to ‘xxx’”之类的错误。

参考

Sourceforge: gendef
Sourceforge: Generating an import library for a DLL
Sourceforge: MSYS2 gendef is not found
Github: gendef
Github: pexports
GNU binutils