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So I have installed gcc-4.4 and gcc-4.3 (same for g++). Now as far as I remember there is a tool in Ubuntu which sets the symlinks for you if you just tell it which version you want. However it does not seem to work in the newest version, which I find disappointing.
Any ideas?
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5 Answers
First erased the current update-alternatives setup for gcc and g++:
Install Packages
It seems that both gcc-4.3 and gcc-4.4 are installed after install build-essential. However, we can explicitly install the following packages:
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Install Alternatives
Symbolic links cc and c++ are installed by default. We will install symbol links for gcc and g++, then link cc and c++ to gcc and g++ respectively. (Note that the
10
, 20
and 30
options are the priorities for each alternative.)Configure Alternatives
The last step is configuring the default commands for gcc, g++. It's easy to switch between 4.3 and 4.4 interactively:
Or switch using script: Network mapper software.
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execute in terminal :
Okay, so that part is fairly simple. The tricky part is that when you issue the command GCC it is actually a sybolic link to which ever version of GCC you are using. What this means is we can create a symbolic link from GCC to whichever version of GCC we want.
- You can see the symbolic link :
- So what we need to do is remove the GCC symlink and the G++ symlink and then recreate them linked to GCC 4.3 and G++ 4.3:
- Now if we check the symbolic links again we will see GCC & G++ are now linked to GCC 4.3 and G++ 4.3:
- Finally we can check our GCC -v again and make sure we are using the correct version:
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Is this really desirable? There are ABI changes between
gcc
versions. Compiling something with one version (eg the entire operating system) and then compiling something else with another version, can cause conflict.For example, kernel modules should always be compiled with the same version of
gcc
used to compile the kernel. With that in mind, if you manually altered the symlink between /usr/bin/gcc
and the version used in your version of Ubuntu, future DKMS-built modules might use the wrong gcc
version.If you just want to build things with a different version of
gcc
, that's easy enough, even with makescripts. For example, you can pass in the version of gcc
in the CC
environment variable:You might not need it on the make command (configure scripts usually pull it in) but it doesn't hurt.
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Edit:
This assumes that you have installed the version first, with e.g.:
Original:
And here is a one-liner for those who are lazy, just change change the number at the end to the version you want. It will make the change for gcc and/or g++
In this example I switched to 4.9
There are no error checks and what not in this example, so you might want to check what will be run before you run it. Just add echo before sudo. For completeness I provide check line as well:
The output from the check should be something like:
Spider Man: Edge of Time needs a GPU capable of running DirectX 9. Free game downloads. spider man edge of time pc games. System memory required for Spider Man: Edge of Time is 3 GB performance memory. Another thing to consider is the DirectX capability of your GPU.
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You can check the version after with:
Semi-detailed explanation:
- ls -la /usr/bin/ lists all files in /usr/bin
- | pipe (send) the output to the next command
- grep -oP matches the search regex per line. o only shows the result not the entire matched line. P tells grep to use perl-regex. I will not go into regex here, read up on it if you want to.
- xargs simply put, it gathers the results that are piped to it and send all of them to the end. i.e. to the command following xargs
- bash well, it's bash. The c flag tells it to use the string as a command. In this example it loops over the arguments sent from xargs by skipping the first (0th) argument, in this case the loop skips 4.9. The 0th argument is used in the loop to change the link.
- ln -s -f The s flag makes a symbolic link, f forces unlinking first if needed.
AleAle
How about a symbolic link in a temporary directory:
mkdir x && PATH=$PWD/x:$PATH && ln -s /usr/bin/g++-7 $PWD/x/g++
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This quick tutorial is going to show you how to install the latest Python 3.6.1 in Ubuntu 16.04 LTS via PPA.
Ubuntu 16.04 comes with both Python 2.7 and Python 3.5 by default. You can install Python 3.6 along with them via a third-party PPA by doing following steps:
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1. Open terminal via Ctrl+Alt+T or searching for “Terminal” from app launcher. When it opens, run command to add the PPA:
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Type in your password (no visual feedback due to security reason) when it asks and hit Enter.
2. Then check updates and install Python 3.6 via commands:
Now you have three Python versions, use
python
command for version 2.7, python3
for version 3.5, and/or python3.6
for version 3.6.1.3. To make
python3
use the new installed python 3.6 instead of the default 3.5 release, run following 2 commands:Finally switch between the two python versions for
python3
via command:How To Install Gprof On Ubuntu Download Pc
After selecting version 3.6:
UPDATE: due to this bug, gnome-terminal won’t launch after step 3, a workaround is running following commands to recreate the symlink: