Thank you for the reply,but I meant that when we building,we can not use the native tools such ar and as to process the llvm files,we must have the ability to call llvm-ar and llvm-as instead of the native ones. 在 2009-10-17六的 19:35 -0700，Nick Lewycky写道：> zhunan wrote: > > Hi, > > > > I don't think just use gold-plugin even modified is enough for the task > > of building a whole-program bc file. > > > > When we want to build a whole-program bc file by a general solution(I > > meant that we can use such a method for all kinds of build system),we > > need not only a gold-plugin to do what llvm-ld does,but also some > > mechanisms,not a simple trick to modify the env variables,to run > > ar,ld,ranlib's llvm-counterparts when building. > > Binutils 2.20 supports plugins and 'ar' and 'nm' will work with the gold > plugin. Not sure about ranlib. > > Nick >
2009/10/17 zhunan <zhunansjtu at gmail.com>:> Thank you for the reply,but I meant that when we building,we can not use > the native tools such ar and as to process the llvm files,we must have > the ability to call llvm-ar and llvm-as instead of the native ones.We can use the native tools if they understand llvm IL :-) That is what the plugin does. With it installed you can run nm in a file with LLVM IL and it will print you the symbols. You can also add IL files to an archive and the archive will have a correct symbol table. Cheers, -- Rafael Ávila de Espíndola
Yes,but when I just simply replace lto_codegen_compile(cg, ...) with lto_codegen_write_merged_modules(cg, "/path/to/output.bc") in the gold-plugin.cpp to see if it will generate a correct bc file,the llvm-gcc/llvm-g++ will call the native ld in the linking step,which causes the failture because of that ld can not recognize an object file which contains LLVM's IL. I understand the failture as this: libLLVMgold.so is just a plugin for ld but not llvm-ld,when I want to build a whole-program bitcodes,llvm-ld is the only available tool,so I think gold-plugin is not very useful to archieve the goal,I'm considering to modify the codes of llvm-gcc's collect2 to make it call llvm-ld automatically when receive certain options. Thanks 在 2009-10-19一的 13:58 -0400，Rafael Espindola写道：> 2009/10/17 zhunan <zhunansjtu at gmail.com>: > > Thank you for the reply,but I meant that when we building,we can not use > > the native tools such ar and as to process the llvm files,we must have > > the ability to call llvm-ar and llvm-as instead of the native ones. > > We can use the native tools if they understand llvm IL :-) > > That is what the plugin does. With it installed you can run nm in a > file with LLVM IL and it will print you the symbols. You can also add > IL files to an archive and the archive will have a correct symbol > table. > > Cheers,