[gentoo-user] emerging older compilers

[gentoo-user] emerging older compilers

[karl]

For testing purposes, I would like to install older compilers,
e.g. testing with older kernels.

I have tried to install e.g. gcc-5.4.0-r4, gcc-4.9.4, and
gcc-3.4.6-r2.ebuild (package.unmask is upd. for theese), but it fails.

 You usually install a newer compiler with the older (and that is
well tested), but has anyone tried it the other way ?

Regards,
/Karl Hammar

-----------------------------------------------------------------------
Aspö Data
Lilla Aspö 148
S-742 94 Östhammar
Sweden

Re: [gentoo-user] emerging older compilers

[Andreas K. Huettel]

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Policy is that you *should* be able to go back in steps of two versions. 
Eg. emerge 4.8 with 5.0 ...

However, this is occasionally broken, so please file bugs with the detailed 
logs and versions.


Am Freitag, 30. November 2018, 19:25:46 CET schrieb karl@aspodata.se:
> For testing purposes, I would like to install older compilers,
> e.g. testing with older kernels.
> 
> I have tried to install e.g. gcc-5.4.0-r4, gcc-4.9.4, and
> gcc-3.4.6-r2.ebuild (package.unmask is upd. for theese), but it fails.
> 
>  You usually install a newer compiler with the older (and that is
> well tested), but has anyone tried it the other way ?
> 
> Regards,
> /Karl Hammar
> 
> -----------------------------------------------------------------------
> Aspö Data
> Lilla Aspö 148
> S-742 94 Östhammar
> Sweden


-- 
Andreas K. Hüttel
dilfridge@gentoo.org
Gentoo Linux developer
(council, toolchain, perl, libreoffice, comrel)

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Re: [gentoo-user] emerging older compilers

[karl]

Andreas:
> Policy is that you *should* be able to go back in steps of two versions. 
> Eg. emerge 4.8 with 5.0 ...

# gcc-config -l
 [1] x86_64-pc-linux-gnu-6.4.0 *
 [2] x86_64-pc-linux-gnu-7.3.0
#

That means, go from 6.4 -> 6.2 -> 6.0 -> ... ?

But I don't have thoose ebuilds:

$ ls -1 portage/sys-devel/gcc/
...
gcc-5.4.0-r4.ebuild
gcc-5.4.0-r5.ebuild
gcc-5.4.0-r6.ebuild
gcc-6.4.0-r1.ebuild
gcc-6.4.0-r3.ebuild
gcc-6.4.0-r4.ebuild
gcc-6.4.0-r5.ebuild
gcc-6.5.0.ebuild
...

so that means I'm on my own.

Regards,
/Karl Hammar

-----------------------------------------------------------------------
Aspö Data
Lilla Aspö 148
S-742 94 Östhammar
Sweden

Re: [gentoo-user] emerging older compilers

[Walter Dnes]

On Sun, Dec 02, 2018 at 11:21:55AM +0100, karl@aspodata.se wrote

> so that means I'm on my own.

  You can install a *NON*-default gcc in ${HOME}  This is a two-step
process.  I used to do this a couple of years ago when Pale Moon was
limited in what versions of gcc it would build on.  Note that tarballs
going back to 2.95.1 are available at  http://ftpmirror.gnu.org/gcc
Also, be carefull about the tarball extensions, as of approx June 2017

* gcc-6.1.0.tar.bz2 was released 2016/04/27 with bz2 extension
* gcc-5.4.0.tar.bz2 was released 2016/06/03 with bz2 extension
* gcc-6.2.0.tar.bz2 was released 2016/08/22 with bz2 extension
* gcc-6.3.0.tar.bz2 was released 2016/12/21 with bz2 extension
* gcc-6.4.0.tar.xz  was released 2017/07/04 with xz  extension
* gcc-5.5.0.tar.xz  was released 2017/10/10 with xz  extension

  The download, building, etc, is done in $HOME/gccstuff.  I set up an
automated build script in there.  E.g. to build gcc-5.4.0 and have it go
to $HOME/gcc540 execute the script

------------------------------

#!/bin/bash
#
# Instructions from https://gcc.gnu.org/wiki/InstallingGCC

wget http://ftpmirror.gnu.org/gcc/gcc-5.4.0/gcc-5.4.0.tar.bz2
tar xf gcc-5.4.0.tar.bz2

#
# To get gmp, mpc, mpfr, and isl libs
# You *MUST* run this script from the top-level GCC source dir
cd gcc-5.4.0
contrib/download_prerequisites

#
# You *MUST NOT* run ./configure from the GCC source dir
mkdir gcc-5.4.0/gcc-build && cd gcc-5.4.0/gcc-build

../configure --prefix=$HOME/gcc540 \
             --disable-multilib \
             --enable-libstdcxx-threads \
             --enable-libstdcxx-time \
             --enable-shared \
             --enable-__cxa_atexit \
             --disable-libunwind-exceptions \
             --disable-libada \
             --with-default-libstdcxx-abi=gcc4-compatible

make -j4

make install

------------------------------
  Notes: in the ../configure invocation include the languages and other
options that you need for your situation.  "make -j4" is for a machine
with 4 cores.  Adjust to fit your machine.

  To invoke gcc from $HOME/gcc540 you have to "source" the following
export statements from a plaintext file, early in your build, e.g.

. path/filename

  You must *NOT* invoke a separate shell with #!/bin/bash
For a 64 bit build...
------------------------------
  export GCCX_ROOT=$HOME/gcc540
  export PATH=$GCCX_ROOT/bin:$PATH
  export MANPATH=$GCCX_ROOT/share/man:MANPATH
  export INFOPATH=$GCCX_ROOT/share/info:$INFOPATH
  export LD_LIBRARY_PATH=$GCCX_ROOT/lib64:$GCCX_ROOT/lib:$LD_LIBRARY_PATH
  export LD_RUN_PATH=$GCCX_ROOT/lib64:$GCCX_ROOT/lib:$LD_RUN_PATH
  export LIBRARY_PATH=$GCCX_ROOT/lib64:$GCCX_ROOT/lib:$LIBRARY_PATH
  export INCLUDE_PATH=$GCCX_ROOT/include:$INCLUDE_PATH
  export CPLUS_INCLUDE_PATH=$GCCX_ROOT/include:$CPLUS_INCLUDE_PATH
  export C_INCLUDE_PATH=$GCCX_ROOT/include:$C_INCLUDE_PATH
------------------------------

For a 32 bit build do as above, but first search+replace, changing all
instances of "lib64" to "lib".


-- 
Walter Dnes <waltdnes@waltdnes.org>
I don't run "desktop environments"; I run useful applications

Re: [gentoo-user] emerging older compilers

[karl]

Karl Hammar:
> For testing purposes, I would like to install older compilers,
> e.g. testing with older kernels.
> 
> I have tried to install e.g. gcc-5.4.0-r4, gcc-4.9.4, and
> gcc-3.4.6-r2.ebuild (package.unmask is upd. for theese), but it fails.

 I have found out that I can install thoose older comilers with:

FEATURES="-sandbox -usersandbox" emerge -aqv   =sys-devel/gcc-5.4.0-r4

# since ustat.h is no loger with (>=glibc 2.28) according to 
# https://sourceware.org/git/?p=glibc.git;a=commit;h=cf2478d53ad7071e84c724a986b56fe17f4f4ca7
echo =sys-devel/gcc-4.9.4 -sanitize >> /etc/portage/package.use/gcc
eselect gcc set 1
. /etc/profile
FEATURES="-sandbox -usersandbox" emerge -aqv   =sys-devel/gcc-4.9.4

gcc-3.4.6-r2 still doesn't install though.

Regards,
/Karl Hammar