LLVM 3.0 type system changes

[Jason E. Aten]

On Tue, Mar 8, 2011 at 2:15 AM, Jens Mueller <jens.k.mueller at gmx.de> wrote,
on the old thread titled "LLVM 3.0 type system changes"

> Can you talk me through the building process? I tried it a week ago but
> with no success. Can you post the necessary steps on this list or to me
> in private?
>

I can try to sketch the important aspects, but obviously this protocol
hasn't been tested very widely, so feel free to post back any refinements.
Even better if you want to patch the repositories.  Some of these may be out
of order, especially the CMakeCache.txt edits, so if anything goes wrong,
check the variables mentioned below in CMakeCache.txt, and that your
ldc2.conf is correct. Those are the most important two control files.

I'll start a new thread with a new title to make this easy to find, and more
on topic.

I. Acknowledgements

Heavy credit for this is due to mrmonday on #ldc who guided me and
graciously offered
assistance.  Errors and typos are mine alone.

I. Protocol:  "Building LDC2 on Linux x86_64, as of Feb 28 2011":
II. Protcol: Building LDC2 on Linux x86_64.



Prereqs: cmake, git, hg, llvm2.8 from source already installed (package
installs of llvm2.8 might work too, I don't know).

# 1) Check out ldc2, druntime, and phobos2:
$ hg clone https://bitbucket.org/prokhin_alexey/ldc2
$ cd ldc2
$ git clone https://github.com/AlexeyProkhin/druntime
$ git clone https://github.com/AlexeyProkhin/phobos

# 2) Configure (apparently you can also use ccmake with gui, but I
didn't)$ cmake .


# 3) Fix up the CMakeCache.txt file:

# 3 a) edit CMakeCache.txt by hand, and set D_VERSION to 2, as on
these two lines:
...

//D language version - will originally be set to 1, change it to 2 like this:
D_VERSION:STRING=2

...

# 3 b) check on the variables mentioned in 3 d). I don't think that
they will be present yet, but
if they aren't, it can't hurt to fix them now as well.

# 3 c) make (this should hopefully build bin/ldc2 now )
$ make

# there will be some const warnings, but the build finishes for me.

# 3 d) edit CMakeCache.txt again (it will have changed/had appendixes
now I think) and fix these two variables:


...
//runtime source dir
RUNTIME_DIR:PATH=/home/jaten/pkg/ldc2/ldc2/druntime
...
//phobos2 source dir
PHOBOS2_DIR:PATH=/home/jaten/pkg/ldc2/ldc2/phobos
...

# 4) modify your your .bashrc to set PATH to include ./bin in front of
everything else

echo "export PATH=`pwd`/bin:\$PATH" >> ~/.bashrc
.  ~/.bashrc
which ldc2 # should show the one in ./bin now


# 5) build druntime and phobos with the command: make phobos2


$ make phobos2


# 6) edit   ./bin/ldc2.conf so that it points to the right places.  Here is
a copy of mine that seems to work. The point of the editing is to make sure
that paths are correct, especially the third -I (Include line), which was
often wrong out of the box when I was working with it.

jaten at dfw:~$ cat ldc2.conf
// This configuration file uses libconfig.
// See http://www.hyperrealm.com/libconfig/ for syntax details.

// The default group is required
default:
{
    // 'switches' holds array of string that are appends to the command line
    // arguments before they are parsed.
    switches = [

 "-I/home/jaten/pkg/llvm+lldb+ldc/prokhin_alexeys_ldc2/ldc2/druntime/import",

 "-I/home/jaten/pkg/llvm+lldb+ldc/prokhin_alexeys_ldc2/ldc2/druntime/src",
        "-I/home/jaten/pkg/llvm+lldb+ldc/prokhin_alexeys_ldc2/ldc2/phobos/",

 "-L-L/home/jaten/pkg/llvm+lldb+ldc/prokhin_alexeys_ldc2/ldc2/runtime/../lib",
        "-defaultlib=phobos2",
        "-debuglib=phobos2"
    ];
};
jaten at dfw:~$

# 7) Finished.  Test and note variances from the protocol above.


III. Appendix: Trouble shooting notes

If anything goes wrong, in my experience it was due to the settings in
either CMakeCache.txt, or in ./bin/ldc2.conf  Those are the two places I
would look at first when troubleshooting.

A) When you edit the CMakeCache.txt, be sure to check that PHOBOS2_DIR gets
set to ./phobos and not ../druntime

# example that works:
jaten at dfw:~$ cat CMakeCache.txt.afarm_works_ldc2 | grep PHOBOS2_DIR
PHOBOS2_DIR:PATH=/home/jaten/pkg/llvm+lldb+ldc/prokhin_alexeys_ldc2/ldc2/phobos

# example that DOES NOT work:
jaten at dfw:~$ cat CMakeCache.txt.dfw_notwork_ldc2 | grep PHOBOS2_DIR
PHOBOS2_DIR:PATH=/home/jaten/pkg/ldc2/ldc2/../druntime


B) Be sure in CMakeCache.txt you have these three variables set correctly,
with obvious edits for your paths, not mine:

...
//D language version
D_VERSION:STRING=2
...
//runtime source dir
RUNTIME_DIR:PATH=/home/jaten/pkg/ldc2/ldc2/druntime
...
//phobos2 source dir
PHOBOS2_DIR:PATH=/home/jaten/pkg/ldc2/ldc2/phobos
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