Installing GCC 4.7.x in /opt

[PsyGhost]

I wish to start developing in C++11, and therefore need version 4.7.2 of GCC.
I don't want to install it as my main GCC compiler in order not to break my system, so I wish to install it in /opt.
Of course, I can download the official source tarball and compile it with --prefix=/opt/gcc-4.7.2, but I wounder if there's a "Gentoo way" to accomplish it with portage.

[micia]

Hi,
GCC 4.7.2 is in portage and you can compile it with emerge (since gcc ebuild is slotted, 4.7.2 belongs to the 4.7 slot), you can avoid setting it as your default compiler by using gcc-config, doing so shouldn't break your system, there are a few things that you should acknowledge though:
Sabayon has a different configuration for GCC than portage, the portage version of GCC includes both the runtime libraries (Sabayon's base-gcc) and the compiler itself (Sabayon's gcc). Mind this when performing updates with entropy, especially in the future, when GCC 4.7.x will be available.

[PsyGhost]

Thank you for the assist. I successfully merged GCC 4.7.2 and now it appears in gcc-config -l
However, I wish to experiment it without setting it as the default compiler for the system, since I don't want to compile packages with it, but develop my own software.
When I try to launch:
/usr/x86_64-pc-linux-gnu/gcc-bin/4.7.2/gcc
it tells me that:
gcc: error: hardenednossp.specs: No such file or directory

Is there any way to use the new version without switching to it in gcc-config?

EDIT:
I did:
gcc-config -E x86_64-pc-linux-gnu-4.7.2

and sourced the output.

[King_DuckZ]

I have a similar problem, I need to use gcc 4.7.2 and I don't really mind having it as the default compiler as well (unless there's a good reason for not doing that).

I've done:
# gcc-config x86_64-pc-linux-gnu-4.7.2-vanilla

but when I run gcc --version (or g++) I get:
gcc: error: /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.2/vanilla.specs: File o directory non esistente

In fact, if I locate that file I only get one result:
$ locate vanilla.specs
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/vanilla.specs

so can I just copy it into the 4.7.2 directory?

[sabayonino]

Example to set gcc :

Code: Select all

# gcc-config -l
 [1] x86_64-pc-linux-gnu-4.6.3
 [2] x86_64-pc-linux-gnu-4.7.2 *


Wxample to set [1] profile :

Code: Select all

# gcc-config 1

Code: Select all

# . /etc/profile

check your list

[King_DuckZ]

I already have 4.6.3 set and working, but I need 4.7.2. Plus, I don't want the hardened version, I'd rather use the vanilla compiler, but I get the file missing error. Hardened 4.7.2 (I assume the one with no suffix is the hardened compiler) does indeed work.

[King_DuckZ]

Nobody knows how to fix this?

[lxnay]

I will roll out 4.7.2 very soon...

[wintux]

I will roll out 4.7.2 very soon...

Yes, I just saw that it's already in limbo now!

But the go USE flag is disabled
although all other languages are enabled and
although I requested to enable it in my version bump request.

Please, be so kind and enable the go flag.

[wintux]

Many thanks for enabling the go USE-flag in package sys-devel/gcc-4.7.2-r1!

I will roll out 4.7.2 very soon...

Sorry, it also affects sys-devel/base-gcc-4.7.2-r1.
Could you please change it here, too?

General question:
In order to keep it simple for the maintainers I decided to make to make only one version bump request for both packages (including a hint that it affects both).
Would two separate requests have been better in such a case (packages that belong together)?