[lldb-dev] unable to build lldb on linux

[Todd Fiala]

In the event that you have more than a single processor for this (likely
the case), you can adjust the 'make' command for gcc and use something like
'make -j 10', replacing the 10 with a number something like # procs + 2.
 On my end, I use -j 32 as I have 16 hyperthreaded cores.  On VMs where I
only allocate 4 cores, I'd use something like -j 6.

-Todd


On Sun, Apr 6, 2014 at 10:51 PM, Todd Fiala <tfiala at google.com> wrote:

> Hey Thiago,
>
> Here are some instructions that should get you a gcc 4.8.2 build on Ubuntu
> 12.04 x86_64.  Including lldb-dev again so I can point others to this.  Let
> me know if you hit any issues with it and we'll get that fixed up.
>
> > Yup. Can you help me build gcc? That is a non-trivial task.
>
> Sure thing:
>
>    1. Download gcc 4.8.2 from here.
>    2. Unpack it somewhere.  You can run a command sequence like:
>       1. mkdir ~/src
>       2. cd src
>       3. tar xjf ~/Downloads/gcc-4.8.2.tar.bz2
>       4. # the above will dump the gcc 4.8.2 source tree in
>       ~/src/gcc-4.8.2
>    3. Make sure you have packages installed that gcc will want.
>       1. I think you only need to install libmpc-dev to get what is
>       needed beyond build-essential.  Run something like this: sudo apt-get
>       install build-essential libmpc-dev.
>       2. If you run the next step (configure) and it blows up, send me
>       the output and I'll figure out what's missing.  There are really only a few
>       minor packages and I think that's the only one I have to install beyond the
>       basic build tools.
>    4. Configure gcc
>       1. We're going to install this in /usr/local/gcc/gcc-4.8.2.  You'll
>       have to adjust some of the commands below if you want this to go somewhere
>       else.  This will be the install dir for the compiler.
>       2. Run the following sequence of commands
>          1. cd ~/src
>          2. mkdir build-gcc-4.8.2
>          3. cd build-gcc-4.8.2
>          4. ../gcc-4.8.2/configure --prefix=/usr/local/gcc/gcc-4.8.2
>       5. Build and install gcc
>       1. Run the following sequence
>          1. # assumes you're still in ~/src/build-gcc-4.8.2
>          2. make
>          3. sudo make install
>        6. Adjust your environment variables
>       1. vim/emacs ~/.bashrc
>       2. add the following lines to the bottom of your .bashrc file:
>
> export PATH=/usr/local/gcc/gcc-4.8.2/bin:$PATH
>
> export LD_LIBRARY_PATH=/usr/local/gcc/gcc-4.8.2/lib64:$LD_LIBRARY_PATH
>
>
> At this point you can restart your shell and you should have a gcc 4.8.2
> gcc/g++ compiler that gets picked up ahead of the Ubuntu 12.04 gcc 4.6.3.
>  Verify this by running "g++ --version" at the command prompt.  It should
> say that it is version 4.8.2.  If for some reason you don't get that to
> happen, make sure your .bash_profile (or .profile) is picking up the
> .bashrc file, and make sure we got all the paths right for where you
> installed gcc 4.8.2.
>
> From here you should be able to run an LLDB configure/make or cmake/ninja
> build.
>
> Let me know if you hit any trouble with that.
>
> Sincerely,
> Todd Fiala
>
>
> On Sat, Apr 5, 2014 at 7:47 PM, Thiago Farina <tfarina at chromium.org>wrote:
>
>> Off-list.
>>
>>
>> On Sat, Apr 5, 2014 at 10:13 PM, Todd Fiala <tfiala at google.com> wrote:
>>
>>> Ok cool.  That's our standard OS over here.
>>>
>>> I'd recommend:
>>>
>>> 1. building a gcc 4.8.2 from source.  A standard download, unpack, mkdir
>>> on a parallel build dir, configure --prefix=/some/install/path, etc. to
>>> give you a gcc 4.8.2 on Ubuntu 12.04.  Let me know if you have trouble with
>>> that
>>>
>> Yup. Can you help me build gcc? That is a non-trivial task.
>>
>>
>>> .  The key here is that you'll get a functional libstdc++ that will work
>>> for the later steps in addition to sufficient c++11 support.  You'll need
>>> to add the install lib64 path to your LD_LIBRARY_PATH and similarly for
>>> linker -L options on the linker command line.
>>>
>> Can you specify this lib64 step?
>>
>>
>>> 2. build the latest cmake release from source and install somewhere
>>> local.  The latest available for Ubuntu 12.04 I think gave me errors since
>>> it was too old.
>>>
>>> I do also build cmake from source already.
>>
>>
>>> 3. grab a configure buildable libedit (we get it from here<http://thrysoee.dk/editline/>).
>>>  You might be able to survive with libedit-dev from Ubuntu 12.04 now, but
>>> for a while that was not sufficient.  If you build it, you'll need to add
>>> the lib64 path to your LD_LIBRARY_PATH, and a -L for the lib path and -I
>>> for the header path.
>>>
>>> OK
>>
>>
>>> 4. Not sure exactly where you got your ninja, build I found on Ubuntu <
>>> 13.10 I have to install it from source.  You may have a valid route too,
>>> that's just been my experience.
>>>
>>> I build ninja since its beginning from
>> https://github.com/martine/ninja.git :)
>>
>> --
>> Thiago Farina
>>
>
>
>
> --
> Todd Fiala | Software Engineer |  tfiala at google.com |  650-943-3180
>



-- 
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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