LinuxQuestions.org - [SOLVED] How to force NS2 to use the version 4.4 of gcc instead of 4.6.3

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- - How to force NS2 to use the version 4.4 of gcc instead of 4.6.3 (https://www.linuxquestions.org/questions/linux-software-2/how-to-force-ns2-to-use-the-version-4-4-of-gcc-instead-of-4-6-3-a-4175485823/)

How to force NS2 to use the version 4.4 of gcc instead of 4.6.3

hi all
am having some problem with my ns2 , it was working fine up until it doesnt anymore and i am suspecting the updates to be incompatible with the version of my unix system [Ubuntu 12.04 LTS]. in fact when i ran a tcl script it runs in half and exits while it was running perfectely before. i dont know what must be the error because there is no error printd in the screen, apart of the fact that when i check the trace file i can see that the packets were not sent.
i would like to downgrade the gcc to the 4.4 version. How can i do this?

Code:

boris@boris-Veriton-M680G:~/ns-allinone-2.35$ gcc -v

Using built-in specs.

COLLECT_GCC=gcc

COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.6/lto-wrapper

Target: i686-linux-gnu

Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu

Thread model: posix

gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)

First : You can have as many versions of gcc/g++ as you want,
installed at the same time.

Using gcc/g++ version 4.4 :
$ cd ns-allinone-2.35/ && export CC=gcc-4.4 CXX=g++-4.4 && ./install
*** This is not "forcing", but a quite ordinary command !

Reconfiguring in ns-2.35 :
$ cd ns-allinone-2.35/ns-2.35/ && export CC=gcc-4.4 CXX=g++-4.4 && ./configure

All versions, ns-2.26 ... ns-2.34 : Use gcc/g++ version 4.1.2 :
Post #18 http://www.linuxquestions.org/questi...022/page2.html

-

you can export the version ( as above , VERY good option for ns2)

set the version in "Alternatives" ( this is what it is meant for )

or use a shell script to set the links in /usr/bin to the version you want to use
-- the last way is what i use ( very old habit from before alternatives )

Quote:

Originally Posted by knudfl (Post 5070446)

Hi knudfl
indeed i did that command before posting, while i was installing the 2.35 version (was using ns-allinone2.34)
and i thought it will appear when i typed gcc -v, but it shows the 4.6 version of gcc. so i thought it failed.
Thank you anyway for the assistance, i think of downgrading my version of ubuntu as well to see if ns2 will work again.
thanks

There is NO NEED to reinstall a old version of Ubuntu
Just install a older copy of Gcc
i currently have Gcc 3.4, 4.3 and 4.6 installed and checking Gcc 4.8 for problems with the programs i MUST HAVE

Quote:

Originally Posted by John VV (Post 5070763)

There is NO NEED to reinstall a old version of Ubuntu
Just install a older copy of Gcc
i currently have Gcc 3.4, 4.3 and 4.6 installed and checking Gcc 4.8 for problems with the programs i MUST HAVE

Understood, but a question though, isnt it going to tell me that i already have the most current version of gcc and therefore refuse to download the old one?
if anyone is using ns2, can i forward to him the module to test-on

NO
you install gcc 4.4 along side 4.6
you then export the version to use
or set the version id alternatives
or you set the version using a shell script

BUT you HAVE to install an older version of GCC
i normally have 3 or 4 different versions installed

The software IS DESIGNED so that more than one version can be installed

just like Python is designed
i have 3 versions on Python installed and 4 versions of gcc

Quote:

Originally Posted by John VV (Post 5070974)

Okay. I did all of that. Ns ia working but still run my tcl script
in half. Guess the problem is elsewhere but for this thread
I could do what i asked for. And installed an old version of gcc
thank you for your assistance, i will mark it as solve.