similar to: [LLVMdev] Compile a large project with llvm?

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

Wink zhang wrote: > 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. > If you just want to compile the program with llvm-gcc, then Diego's instructions are fine. If, however, you want to do inter-procedural optimization or whole

Wink zhang wrote: > 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'm a little confused. Whole-program analysis requires that you link all of the individual bitcode files from different compilation unit (i.e., individual .c files) together into a single

Dear John, Thank you very much for your help! I will try the libLTO's approach. I believe the situation can fit me well. Again, thank you for your time. -Wink John Criswell wrote: > Wink zhang wrote: >> 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

Hi John, Are there any documents about how to add a pass into LTO? Cheers, Zheng On 19 April 2010 15:11, John Criswell <criswell at uiuc.edu> wrote: > Dear Zheng Wang, > > You have a few options: > > 1) You can add your pass to the set of passes that llvm-gcc runs when it > optimizes code.  This requires re-compiling llvm-gcc; it also means that > your pass must be

Hi All, I am using clang to compile Mysql source code. Because I want to do some inter-procedural analysis, hopefully, I want to get a .o(bitcode) file(a module) containing all possible function declarations and definitions. Is it possible to do that ? Or you guys have some suggestions? To be clear, like Mysql, there is a mysqld routine, which is a major routine. I want to mysqld.o(which is

Hello, As far as I know, the LLVM pass manager only perform at the llvm bytecode level. This means for each program, I have to convert it to a LLVM bytecode by: llvm-gcc -c -emit-llvm test.c then, I can issue the llvm pass manager to invoke my own pass and produce an output as LLVM bytecode, such as: opt -my-pass < test.o > test.new.o After this point, I need to convert it to assembly

I am learning to do some basic dataflow analysis on C code projects, such as Apache httpd. Now I am a newbie of LLVM IR, and there are some problems in doing that. In the official User Manual of how to write a LLVM PASS, they only show the way to generate IR of a single ".c" source file. But in fact there are so many examples that the usage and definition of a function are not in the

Dear Zheng Wang, You have a few options: 1) You can add your pass to the set of passes that llvm-gcc runs when it optimizes code. This requires re-compiling llvm-gcc; it also means that your pass must be able to run on incomplete programs and be run multiple times over the same code (i.e., it cannot do whole-program analysis). 2) You can change the build system of the program you're

Hi All, How to write a link time optimization pass in llvm with LTO? Is there a document, just like http://llvm.org/docs/WritingAnLLVMPass.html tells us how to write a llvm pass? Thanks,

On 26.01.2011, at 04:39, John McCall wrote: > On Jan 24, 2011, at 10:36 AM, Hendrix_ at gmx.net wrote: >> I was using "clang -O3 -S -emit-llvm" got some very optimized output. >> >> Then I did "clang -S -emit-llvm" (without optimization) and wanted to optimized the code in a >> separate pass. The llvm program "opt" did not do anything.

On Jan 27, 2011, at 12:02 PM, Hendrix_ at gmx.net wrote: > OK, I am looking for "LTO"/global optimization. So the function definition will remain "somewhere else" (externally), and the optimizer will find in some other module to possibly inline it later on. > > I am planning to concat all the *.ll (eg "link" the files) and pass them to the

Hi, Is there a tutorial on how to get started with writing link-time optimization passes? The documentation at http://www.llvm.org/docs/LinkTimeOptimization.html explains the design of the LTO interface, but does not explain where to start writing code. Would my pass go inside libLTO.a or is it separate from libLTO.a? What I would like to be able to do is traverse through the entire

> > > Is there a reason why LLVM's link-time optimization won't work for you? > > http://llvm.org/docs/GoldPlugin.html > http://llvm.org/docs/LinkTimeOptimization.html > > Well the primary motivation to move to LLVM is licensing which is why we also ditched binutils since we can't package gcc for iOS due to the GPL. So in the end the gold plugin wouldn't

On May 26, 2009, at 10:52 AM, Rafael Espindola wrote: > Today support for plugins has been committed to BFD. That is the file > format abstraction library used by binutils. This now works Very nice Rafael! Can you please update the web page to mention this, e.g. in the LinkTimeOptimization.html document and wherever else relevant? -Chris > > $ llvm-gcc -emit-llvm -O2 -c a.c

Hello all, I'm a research assistant at the University of Wisconsin and we're trying to come up with a general way to run our whole program analysis over programs that may use different methods to perform the build. I saw some discussion that liblto could be used for this (and safecode successfully did it) for llvm 2.6 - 3.0, but that doesn't seem to be working the same way with llvm

Thanks John. Your approach worked fine for my small toy program. Now, I would like to run my module pass on a huge project (still a single executable) consisting of a few thousand bit code files scattered in many different directories. And some of them are static libraries. Do you still think it's a good idea to manually gather and link them with llvm-ld? I've seen other module pass

Hi, I want to compile apache httpd using LLVM compiler. However, I am interested in generating llvm bytecode files [.s or .ll] files along with its executables. I followed steps mentioned in link : http://stackoverflow.com/questions/13851661/compiling-apache-httpd-into-llvm-bytecode-using-clang However after following all instructions when I compile httpd with following options I get directly

On 27.01.2011, at 21:12, Devang Patel wrote: > > On Jan 27, 2011, at 12:02 PM, Hendrix_ at gmx.net wrote: > >> OK, I am looking for "LTO"/global optimization. So the function definition will remain "somewhere else" (externally), and the optimizer will find in some other module to possibly inline it later on. >> >> I am planning to concat all the

On 8/19/11 4:36 PM, Jinwook Shin (HOTWING) wrote: > > Thanks John. Your approach worked fine for my small toy program. Now, > I would like to run my module pass on a huge project (still a single > executable) consisting of a few thousand bit code files scattered in > many different directories. And some of them are static libraries. Do > you still think it's a good idea