[LLVMdev] Running LLVM Analysis on real-world projects.

Pratik Mehta mehta.pr.y at gmail.com
Thu Mar 30 22:08:35 PST 2006

Thanks for your valuable input. By the way, I am exporting CC=llvm-gcc
and RANLIB=llvm-ranlib for projects that use it. It was a mistake not
to write it in the post as apache indeed uses gcc. If you see the
error message, you would see llvm-gcc being used. I would try to
investigate further on the lines you have mentioned. However, the
question that stands is how to best handle failure to compile few
files, as I am only interested in generating the bytecode and merging
it in one file to run the analysis and not executing the bytecode.

On 3/30/06, Misha Brukman <brukman at cs.uiuc.edu> wrote:
> On Thu, Mar 30, 2006 at 04:27:55PM +0530, Pratik Mehta wrote:
> > I have made few attempts to compile some software packages with llvm.
> > My approach is to define Make variables as follows :
> >
> > export AS=llvm-as
> > export LD=llvm-ld
> > export AR=llvm-ar
> > export CXX=llvm-g++
> >
> > and then run configure and make.
> >
> > This approach works with very small code bases only.
> I noticed you are setting CXX but not CC. C, especially C99, is not a
> strict subset of C++98, so if you are compiling C code, you should use a
> C compiler, and if you are compiling C++, you should be using a C++
> compiler.  For this reason, below, I am setting both CC and CXX and
> letting the program compile itself as it wishes (apologies in advance
> if llvm-g++/g++ automatically invoke llvm-gcc/gcc on a .c file and this
> point is moot).
> At one point, some time ago, I was also working on this as well.
> My approach and results are here: http://llvm.org/status/
> Note that it hasn't been updated since 2004 (one entry in 2005).
> You'll note at the time I was able to run xboard, gnuchess, crafty (the
> first three played well together; pun intended), mutt, screen, wget,
> gnuplot and apache httpd (see below).
> In the best case, one of these would work:
> % env CC=llvm-gcc CXX=llvm-g++ ./configure [configure options]
> or
> % ./configure CC=llvm-gcc CXX=llvm-g++ [configure options]
> but in other cases I had to patch Makefiles, and sometimes even source
> code itself (my screen patch was for an error in screen that GCC
> ignored; the patch was accepted into mainline CVS of screen).
> In some cases, we needed to specify extra parameters to lli to run the
> code via the JIT because gccld wasn't good at generating the run script.
> gccld has vastly improved in the time since my tests in 2003 and 2004,
> but I don't know how well it works now.
> Please note that the status page is hand-written and hand-updated.  It
> would be great to have an automatically-generated status page where
> packages would be compiled and tested (they should have their own
> unit/regression tests) just like the nightly tester.  Naturally,
> compiling and testing something like KDE and Mozilla might take longer
> than just one evening. ;-)
> Brian Gaeke had a framework for external tests (it's linked to from my
> status page but it's no longer available).  It's written in perl and
> was used to test a bunch of the packages (listed on the status page).
> If anyone is interested in using it as a base of an automated testing
> framework for external packages, I can post it for people to play around
> with.
> > /bin/sh /httpd-2.0.55/srclib/apr/libtool --silent --mode=compile
> >   -I../include -I../include/arch/unix  -c apr_snprintf.c && touch
> > apr_snprintf.lo
> > In file included from apr_snprintf.c:22:
> > ../include/apr_network_io.h:122: error: redefinition of `struct in_addr'
> > make[4]: *** [apr_snprintf.lo] Error 1
> >
> > However, this source compiles fine with gcc32 and gcc4
> We also had some problems compinling apache-2 and did not get to the
> bottom of it.  We stuck with using apache-1 and I believe the website
> http://safecode.cs.uiuc.edu/ was at some point (or still is?) hosted by
> Apache-1.3 running in LLVM via the JIT.
> If you can narrow this test case down to a manageable size and see if
> it's an error in llvm-gcc or if the code is not standards-conformant and
> should be fixed, that would be great.  If it's a bug in LLVM, please
> file it at http://llvm.org/bugs/ .
> --
> Misha Brukman :: http://misha.brukman.net

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