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I am using Ubuntu 11.04. I have installed the compiler gcc 4.5 by using the command sudo apt-get install gcc 4.5 in terminal. Now I need the command to enable OpenMP. Is it gcc -fopenmp foo.c ?

@pl1nk I started from the beginning:

1st step=> sudo apt-get install build-essential

2nd step=> sudo apt-get install gcc 4.5

And now the output of gcc -v is:

**ubuntu@ubuntu:~$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.5 --enable-shared --enable-multiarch --with-multiarch-defaults=i386-linux-gnu --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib/i386-linux-gnu --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib/i386-linux-gnu --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin --enable-gold --enable-ld=default --with-plugin-ld=ld.gold --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 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)** 

In few words the same results....
What should I do now?
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1 Answer

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Run update-alternatives --config gcc to be asked to choose the GCC version you want to use among those installed.

Then you could run gcc with the chosen version.

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It looks like there is only one version – Anita 7 May 31 '12 at 22:42
ubuntu@ubuntu:~$ update-alternatives --config gcc update-alternatives: error: no alternatives for gcc. – Anita 7 May 31 '12 at 22:42
@Anita7 How did you install gcc 4.5? What´s the output of ggc -v – pl1nk May 31 '12 at 22:47
I have installed the compiler gcc 4.5 by using the command sudo apt-get install gcc 4.5 – Anita 7 Jun 1 '12 at 12:28
@Anita7 It seems that you have only gcc 4.5 installed. You can proceed with gcc -fopenmp foo.c as you mentioned. – pl1nk Jun 1 '12 at 12:45
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