[SOLVED] problem in changing gcc version

rc49 · 04-12-2017, 01:34 AM

i am trying to change gcc version in my system
my system specifications are:
ubuntu 12.04 (32 bit)

i search for this on google and find that version of gcc and g++ have to changed together so i followed the link below

https://codeyarns.com/2015/02/26/how...-alternatives/

but when i run following command

Code:

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6.3 100 --slave /usr/bin/g++ g++ /usr/bin/g++-4.6.3

got following error

Code:

update-alternatives: error: alternative path /usr/bin/gcc-4.6.3 doesn't exist.

i check my gcc version using command :

Code:

gcc --version

got following output

Code:

gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

any help will be appreciated.
thank you

notKlaatu · 04-12-2017, 01:44 AM

I don't use Ubuntu or Debian, but what I would do is confirm that /usr/bin/gcc-4.6.3 actually exists. Bash is rarely wrong; just because gcc --version returns 4.6.3, it doesn't mean that the file is necessarily located at /usr/bin/gcc-4.6.3

Look in /usr/bin and find out what the gcc (and g++) symlinks are actually called.

knudfl · 04-12-2017, 07:27 AM

@rc49

If you want gcc-4.6.3 fully installed please do
sudo apt-get install g++ ( Will install gcc-4.6, g++-4.6 )

* Actually gcc-4.6 / g++-4.6 (4.6.3) is already the default system compiler for Ubuntu 12.04 !

rc49 · 04-12-2017, 08:09 AM

Quote:

Originally Posted by knudfl

@rc49

If you want gcc-4.6.3 fully installed please do
sudo apt-get install g++ ( Will install gcc-4.6, g++-4.6 )

* Actually gcc-4.6 / g++-4.6 (4.6.3) is already the default system compiler for Ubuntu 12.04 !

hello knudfl
i already have fully installed gcc and g++.
actually i want to run leach patch on ns2.35. i installed it using steps posted on following link

http://www.nsnam.com/2015/05/leach-p...in-ns2-ns.html

after completing all steps, when i test patch... it gives following error

Code:

Error!!
str2addr:Address 2147483647 outside range of address field length 1073741824

i searched it on google and found that it could be fixed by switching to gcc 4.3

i also tried following command

Code:

sudo apt-get install build-essential autoconf automake libxmu-dev gcc-4.4 g++-4.4

after this when i check version of gcc using command : gcc --version
it again shows 4.6.3
any content if u have regarding this issue then it will be very helpful!!

knudfl · 04-12-2017, 09:53 AM

Re #4.

Quote:

str2addr:Address 2147483647 outside range of address field length 1073741824

That's because you are using a 32bits OS.
Leach for ns-2.35 works with a 64bits OS only.

There is no reason to do anything to the OS in order to use a different compiler.
1) Old version (2011) of ns-allinone-2.35 :
$ export CC=gcc-4.4 CXX=g++-4.4 && ./install

2) Use the Oct2014 update, ns-allinone-2.35_gcc482.tar.gz (All gcc/g++ versions -4.4.. -5.3)
https://drive.google.com/file/d/0B7S...ew?usp=sharing
Then the build command is simply ./install

A later HOWTO for the "T S Pradeepkumar LEACH" : post #11 ...
http://www.linuxquestions.org/questi...4175556129/#11
... Much easier to do "everything editing" with a single patch = leach_ns235-Jun2015.patch

Visualization : generate file for xgraph → leach__nodes-alive.awk, post #9
http://www.linuxquestions.org/questi...-4175556129/#9

-

rc49 · 04-14-2017, 08:21 AM

Quote:

Originally Posted by knudfl

Re #4.

That's because you are using a 32bits OS.
Leach for ns-2.35 works with a 64bits OS only.

There is no reason to do anything to the OS in order to use a different compiler.
1) Old version (2011) of ns-allinone-2.35 :
$ export CC=gcc-4.4 CXX=g++-4.4 && ./install

2) Use the Oct2014 update, ns-allinone-2.35_gcc482.tar.gz (All gcc/g++ versions -4.4.. -5.3)
https://drive.google.com/file/d/0B7S...ew?usp=sharing
Then the build command is simply ./install

A later HOWTO for the "T S Pradeepkumar LEACH" : post #11 ...
http://www.linuxquestions.org/questi...4175556129/#11
... Much easier to do "everything editing" with a single patch = leach_ns235-Jun2015.patch

Visualization : generate file for xgraph → leach__nodes-alive.awk, post #9
http://www.linuxquestions.org/questi...-4175556129/#9

-

hello knudfl
i followed all the steps n installed 2014 update of ns2.35 and for leach patch i followed post #11.
after completing all the steps.. at last when i run command :

Code:

./leach_test

i receive same error in leach.err

Code:

INITIALIZE THE LIST xListHead
Error!!
str2addr:Address 2147483647 outside range of address field length 1073741824

knudfl · 04-14-2017, 08:39 AM

Re post #6 : Please do not quote entire post. A "one word reference" will do.

Your errors : So which 64bits OS are you now using ? ?

rc49 · 04-14-2017, 08:45 AM

@knudfl
i m using ubuntu 12.04 32bit
i have mentioned it in earlier posts!!

rc49 · 04-14-2017, 08:58 AM

Quote:

Originally Posted by knudfl

Re post #6 :

Your errors : So which 64bits OS are you now using ? ?

i m using ubuntu 12.04 32 bit
is it possible on my system to add patch of leach????

knudfl · 04-14-2017, 10:11 AM

Re #9.

Please read post #5 : »» Leach for ns-2.35 works with a 64bits OS only. ««

32bits :
The older leach version will kind of work : leach+pegasis_ns234.patch
... and output a less rich result than the ns235 version.

Code:

cd ns-allinone-2.34/
patch -p0 < ns234_gcc49.patch
https://drive.google.com/file/d/0B7S...ew?usp=sharing
zcat leach+pegasis_ns234.patch.gz | patch -p0
https://drive.google.com/file/d/0B7S...ew?usp=sharing
./install
cd ns-2.34/
sudo make install
./test

-

Shadow_7 · 04-14-2017, 10:56 AM

update-alternatives are for things that link to something in /etc/alternatives/, which gcc doesn't do.

$ ls -l /usr/bin/gcc*
$ ls -l /usr/bin/g??

At a low level you can change the /usr/bin/gcc link to the version that you want. And g++, gdb, ..., ..., ... Which update-alternatives might handle, but probably not how you're supposed to do it IMO. For some things you can set the CC and CXX type environment variables and that would work. Depending on if gcc is hard coded into the build scripts. It should NOT be, but it often IS hard coded.

For 64 bit on a 32 bit system, you should avoid that. Where 32 bit on a 64 bit system is more possible.