similar to: [LLVMdev] Linking a bc file

Hello Alexandre, > I'm trying to test a bitcode file that I created using the LLVM API. Using llvm-g++, how can I compile.a C++ file and link it against my bc file ? I try to call a single function in the bc file from the c++ main function. You need to have a linker which supports linking of LLVM bitcode. So far this is darwin linker and gold with extra plugin. This doc might be helpful:

I got your point! Thanks a lot, Rafael! Best, Tianyin On Tue, Jun 26, 2012 at 4:12 PM, Rafael Espíndola < rafael.espindola at gmail.com> wrote: > > Could you explain a bit more (sorry I'm not from a compiler background)? > So, > > what's the difference in the analysis perspective? What does "reading ELF > > files and archives" and "creating a

It appears that llvm-ld can handle bitcode files but llvm-gcc complains that when I pass bitcode files to it. I assume that means that llvm-gcc does not use llvm-ld by default. Is there a way to force it to use llvm-ld? Bill Wendling wrote: > You do it by using the -flto flag. But you will need a linker that's able to handle the bitcode files. The Apple linker can and so can the

Dear all, I'm trying to use the gold plugin to make it easier to generate LLVM bitcode from complex applications. I did the steps mentioned on "http://llvm.org/docs/GoldPlugin.html". Both linking and LLVM generation seem to work properly, however when using the tool ar, the symbol table is lost. "no archive symbol table (run ranlib)". I'm using LLVM 2.9, Ubuntu 10.10,

Hi, It was suggested that I post my question regarding a LLVM 3.4 performance regression to this mailing list, rather than stackoverflow. So here is the link: https://stackoverflow.com/questions/22902034/llvm-3-4-performance-regressed Thanks :) Jens -- Jens Tröger http://savage.light-speed.de/

Hi, > I got your point! Thanks a lot, Rafael! one big difference is that llvm-link doesn't do any optimization, while the gold linker does. You can get something similar to gold by using llvm-link, and then running "opt -std-link-opts" on the linked bitcode file. However all symbols will be internalized by default (you can adjust this on the command line) while the gold linker

r172749 removed Linker/LinkArchives.cpp and Linker/LinkItems.cpp citing: This code is dead, and the "right" way to get this support is to use the platform-specific linker-integrated LTO mechanisms, or the forthcoming LLVM linker. Could someone please expand on what the "right way" is and these LTO mechanisms or where I can find further information? We used several

Hello again, My partner and I am modifying a PEG parser generator to produce LLVM bitcode from a version of a parsing expression grammar that takes LLVM Assembly as code. It accepts external libraries in its current state so we are writing an external library in C++ using C bindings for the linkage. Trying to get it to link is proving to be more challenging than expected. My partner is trying

Dear John, Thanks for your reply. I want to do whole program analysis, all what I need are just the separate .bc files. What instructions should I follow? I run the configure on apache in this way: CC=clang CFLAGS=-emit-llvm ./configure while I get the error message like: checking for gcc... clang checking for C compiler default output file name... configure: error: C compiler cannot

Hi Chris, What functions were you using, and what features of them were you using? If you just need to link individual bit codes together, you can do it in exactly the same way that llvm-link does (using Linker::LinkModules). If you really need features like being able to pull objects out of archives, then you should use an LTO enabled linker (either the system linker on OS X, or gold + the gold

question about: http://llvm.org/docs/FAQ.html#translatec++ "With llvm-gcc3, this will generate program and program.bc." Is this llvm-gcc3 only out of date of is it really only llvm-gcc3? I have 'llvm-g++ (GCC) 4.2.1 (Based on Apple Inc. build 5546) (LLVM build)' installed on Ubuntu and followed that guide and it creates indeed no .bc file. Regards, -mr

Hi, all. I am using llvm-gcc to compile some softwares, and compile them with CFLAGS="-emit-llvm" to gernerate bitcode IR. Then I have to replace normal ld with llvm-ld. Unfortunately, llvm-ld doesn't support -shared option which is used to create a shared library. I've also noticed that llvm-ld supports an option '-link-as-library' which is used to generate

Hi,all I have written a wrapper which includes gcc/g++,ld and llvm counterparts, it invokes native or llvm compiler and linker according to the options it receives,after I replace the native tools with my wrapper in libtool script, I just typed like this make CC=wrapper AC_CFLAGS=-emit-llvm then I got a bc file of slapd and other tools in clients directory The accessory is the whole-program

Hi, all I use llvm-gcc -O4 to compile SPEC 2000, some benchmarks can't be built successfully, such as 164.gzip, 175.vpr etc. The error messages are as follows. .. zh.o unlzw.o unpack.o unzip.o util.o zip.o -o gzip bits.o: file not recognized: File format not recognized collect2: ld returned 1 exit status specmake: *** [gzip] Error 1 specmake options 2> options.err |

Hi All, I am migrating a build system of an existing project from 'Object files' based executable generation to 'LLVM Bitcode' files based exe generation and applying OPT pass to LLVM Bitcode. I found out the following 4 step procedure. Please let me know if this is the right procedure or is there any other easy way of doing it. I need to modify 'Makefile' accordingly. I

Hi, How to compile a large project (such as Apache) by using llvm-gcc? I tried to replace CC with llvm-gcc and CFLAGS with -emit-llvm while running configure, but it didn't work. Thank you for your help. -Wink

On Wed, Sep 17, 2008 at 1:31 PM, Michael Reichenbach <michael_reichenbach at freenet.de> wrote: > question about: > http://llvm.org/docs/FAQ.html#translatec++ > "With llvm-gcc3, this will generate program and program.bc." > > Is this llvm-gcc3 only out of date of is it really only llvm-gcc3? Those instructions are out of date; the current version of llvm-gcc

> > but doesn't emit optnone and nounwind attributes > s/nounwind/noinline On Mon, Jan 28, 2019 at 11:35 AM Jakub (Kuba) Kuderski < kubakuderski at gmail.com> wrote: > As far as I understand, gllvm doesn't run LTO pipeline or any cross-module > optimization, and the optimization level provided is only used to compile > each Translation Unit separately. > If you

This works great. > You can also try using the gllvm wrapper: https://github.com/SRI-CSL/gllvm ; it's quite reliable and easy to use in my experience. Just to be sure. Only one version of bc file will be generated that corresponds to the compiler options provide at configure? The original approach using ld.gold will provide several .bc files that correspond to different stages of the

On 2009-12-23 08:22, Li Shengmei wrote: > > Hi, all > > I use llvm-gcc –O4 to compile SPEC 2000, some benchmarks > can’t be built successfully, such as 164.gzip, 175.vpr etc. > > The error messages are as follows. > > > > …… > > zh.o unlzw.o unpack.o unzip.o util.o zip.o -o gzip > > bits.o: file not recognized: File format not recognized