128 lines
4.4 KiB
Text
128 lines
4.4 KiB
Text
Backporting to older platforms
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==============================
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:Date: 11/2015
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:toc:
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GCC-4.9
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-------
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Currently (as of 8/2015), we require a quite recent compiler and likewise a suitable
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C++ standard library for the build. The reason is that we set the language compatibility
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level to `-std=gnu++14`. If you're on a platform with an older compiler and standard library,
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you need a way to install a recent toolchain in a way, that the standard library includes
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like e.g. `#include <functional>` will indeed pick up a suitably modern standard library,
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in addition to being compiled with a recent compiler (GCC-4.9 or CLang 3.5). The way to
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achieve this is different for every distribution; we'll show the solution for
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»Ubuntu Trusty 14.04 LTS« here as an example
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GCC and Libstdc++ 4.9 on Ubuntu Trusty
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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While the standard compiler for Unbutu in 2014 was GCC-4.8, the _Ubuntu Toolchain Project_
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provides builds and packages for more recent toolchains through an _PPA_. So we'll add that
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PPA as an additional package source, install a GCC-4.9 with the accompanying standard
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library, and finally switch the system standard for C/C++ compiler to this new version.
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All these steps are reversible and can be deactivated when causing problems elsewhere...
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* add the https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test[Ubuntu Toolchain PPA]:
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+
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----
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sudo add-apt-repository ppa:ubuntu-toolchain-r/test
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sudo apt-get update
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----
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* get the compiler and standard library
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+
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----
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sudo apt-get install gcc-4.9 g++-4.9
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----
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* switch the system standard for ``C compilation'' -- make sure to tie the switch for
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C and C++ compiler, to avoid mixing generated code for incompatible library versions.
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+
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----
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sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 \
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--slave /usr/bin/g++ g++ /usr/bin/g++-4.9
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----
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Assuming you've also installed the standard gcc`(4.8)` package, you can arrange matters
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such as to be able to switch back and forth between both compilers. For this to work,
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we need also to make the (default) gcc-4.8 an option in the choice
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----
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sudo apt-get install gcc-4.8 g++-4.8
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sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 \
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--slave /usr/bin/g++ g++ /usr/bin/g++-4.8
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----
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From this point on, we can switch configuration by
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----
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sudo update-alternatives --config gcc
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----
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Building on Mint 17.2 (Rafaela) -- gcc and Libstdc++ 4.9
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Since Mint is based on Ubuntu LTS, we're facing pretty much the same situation here.
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But what makes matters yet more confusing is the fact, that Mint offers even a Clang-3.6
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package, which is _unfortunately_ built to rely on the gcc-4.8 libraries; there is a known
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header inclusion bug in these libraries, which kicks in as soon as we switch to C++14.
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Thus it is _mandatory_ to install the gcc-4.9 from above mentioned Ubuntu-Toolchain PPA,
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which is indeed linked against the 4.9 libraries. Stay away from Clang on Mint for now!
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Transcript from a build session on a ``pristine'' Mint 17.2 installation:
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* add the following to your `/etc/apt/sources.list`
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+
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----
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deb https://lumiera.org/debian/ rafaela experimental
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deb-src https://lumiera.org/debian/ rafaela experimental
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----
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* install _Ichthyo's_ DEB signing key
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+
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----
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gpg --keyserver keyserver.ubuntu.com --recv A1DE94B2
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gpg --export -a A1DE94B2 | sudo apt-key add -
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----
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* prepare build environment
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+
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----
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sudo add-apt-repository ppa:ubuntu-toolchain-r/test
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sudo apt-get update
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sudo apt-get install build-essential gcc-4.9 g++-4.9 git-core
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sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 \
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--slave /usr/bin/g++ g++ /usr/bin/g++-4.9
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sudo apt-get build-dep lumiera
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----
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+
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after that, your system is prepared for building Lumiera
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* now build
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* either by (re)compiling the debian package
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+
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----
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apt-get source lumiera
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cd lumiera
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dpkg-buildpackage
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----
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* or check out the source and hack away...
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+
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----
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git clone git://git.lumiera.org/LUMIERA
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cd LUMIERA
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scons CC=gcc-4.9 CXX=g++-4.9
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----
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+
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...as usual, from this point on, the compiler setting will be remembered in the file
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`optcache`, so no need to repeat it for subsequent `scons` invocations.
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TIP: Just run `scons` for standard build or run the testsuite with `scons check`.
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Use the switch `-j#` with # corresponding to the number of your cores.
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Probably you'll need at least 2GB of memory on AMD64, to build with `-j6`
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