On 4/3/08, wp <qwertygd@xxxxx> wrote: > Hi > I instal another gcc. And now I have two gcc ( gcc 4.0.1 and 4.2.0) instaled > > But when I try change default gcc by: update-alternatives --config gcc i > have the answer: > There is only 1 program which provides gcc > (/usr/bin/gcc-4.0.1). Nothing to configure. > > I install another gcc folow this step: > ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var > --program-suffix=-4.2.0 There are several ways to make a particular gcc the default one. And which works depends on the tools and programs looking for gcc. For example, the last time I tried to compile Qt with a non-default gcc it was impossible to make anything other than 'gcc' work, and it was aknowledged as impossible by the Trolltech team. In that case I believe you can do something like: % which gcc /usr/bin/gcc % mv /usr/bin/gcc /usr/bin/gcc.orig % ln -s /usr/local/bin/gcc-4.2.0 /usr/bin/gcc I have my development environment somewhat better under control since I don't routinely use bad children like Qt. So I set environment variables like so (inside such system resource files such as /etc/profile.d/gcc.sh): export CXX=/usr/local/bin/g++-4.3.0 export CC=/usr/local/bin/gcc-4.3.0 That seems to work for most GNU packages (includiing gcc) which always seem to find my desired gcc version. I also set those variables inside most of my Makefiles. That works for me most of the time, and I've had up to 5 or 6 versions of gcc-X.Y.Z at a time over the years -Tom
