Arch Linux

kunterbunt

Member

Registered: 2016-04-18

Posts: 6

Install gcc45 alongside gcc 6.1.1

Hi,

I have gcc 6.1.1 installed. For one program I require an older compiler. Googling told me that gcc45 (and other versions) are gcc versions in the AUR that install alongside the usual gcc.
So I tried installing gcc45 but I get the following error:

error: failed to commit transaction (conflicting files)
gcc45: /usr/lib/libgcc_s.so exists in filesystem
gcc45: /usr/lib/libgcc_s.so.1 exists in filesystem
gcc45: /usr/lib/libgfortran.so exists in filesystem
gcc45: /usr/lib/libgfortran.so.3 exists in filesystem
gcc45: /usr/lib/libgfortran.so.3.0.0 exists in filesystem
gcc45: /usr/lib/libobjc.so exists in filesystem
gcc45: /usr/lib/libstdc++.a exists in filesystem
gcc45: /usr/lib/libstdc++.so exists in filesystem
gcc45: /usr/lib/libstdc++.so.6 exists in filesystem
gcc45: /usr/lib/libsupc++.a exists in filesystem
Errors occurred, no packages were upgraded.

So those files belong to gcc-libs 6.1.1-2. Makes sense. Apparently gcc45 does not install alongside a newer version. What am I doing wrong?

Last edited by kunterbunt (2016-08-04 19:38:37)

WorMzy

Forum Moderator

From: Scotland

Registered: 2010-06-16

Posts: 11,835

Website

Re: Install gcc45 alongside gcc 6.1.1

Fix the PKGBUILD so it doesn't conflict.

Mod note: Not a pacman issue, moving to AUR Issues.

Last edited by WorMzy (2016-08-04 20:37:16)

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kunterbunt

Member

Registered: 2016-04-18

Posts: 6

Re: Install gcc45 alongside gcc 6.1.1

Fix the PKGBUILD so it doesn't conflict.

And how do I do that? I have never touched a PKGBUILD before and I don't understand the general idea of what to do. The conflicting files belong to a newer version of that library. I could let the older version provide the files but I don't want that as the up-to-date gcc would then not work anymore (and who knows what else). So I want both versions of the library, just as with gcc. Ideally the older version would have a subdirectory containing the files and be told to use them. Is that how you do it? If it is, then how do you do it?

Last edited by kunterbunt (2016-08-05 09:12:02)

Gusar

Member

Registered: 2009-08-25

Posts: 3,605

Re: Install gcc45 alongside gcc 6.1.1

And how do I do that? I have never touched a PKGBUILD before and I don't understand the general idea of what to do.

As I wrote in another thread recently: Then learn. This is Arch. However, in this case the solution is far from obvious, so I'll help you out. Replace this line:

  mv "${pkgdir}/usr/lib/gcc/${CHOST}"/lib*/ "${pkgdir}/usr/lib/gcc/${CHOST}/${pkgver}/" || : # Not needed for 32 bit compile

with this one:

  mv ${pkgdir}/usr/lib/lib* "${pkgdir}/usr/lib/gcc/${CHOST}/${pkgver}/" || : # Not needed for 32 bit compile

This does exactly what you describe, it moves the conflicting files from /usr/lib/ (where the newer, gcc 6 libraries are) into a version-specific directory. I suppose the original line is meant to do that, but it does it incorrectly.

Last edited by Gusar (2016-08-05 09:39:36)

kunterbunt

Member

Registered: 2016-04-18

Posts: 6

Re: Install gcc45 alongside gcc 6.1.1

As I wrote in another thread recently: Then learn. This is Arch.

That's the whole point of me asking. Apparently I was on the right track, too.

Anyway, thanks for your help.

GordonGR

Member

From: Thessaloniki, Greece

Registered: 2011-11-07

Posts: 276

Re: Install gcc45 alongside gcc 6.1.1

You can do it like aur/gcc49 does:

 ## Lazy way of dealing with conflicting man and info pages and locales...
  rm -rf ${pkgdir}/usr/share/
  rm -rf ${pkgdir}/usr/include/
  find ${pkgdir}/ -name \*iberty\* | xargs rm
  
  # Move potentially conflicting stuff to version specific subdirectory
  $(ls "$pkgdir"/usr/lib/gcc/$CHOST/lib* &> /dev/null) && mv "$pkgdir"/usr/lib/gcc/$CHOST/lib* "$pkgdir/usr/lib/gcc/$CHOST/$pkgver/"
  
  # Install Runtime Library Exception
  install -Dm644 ${srcdir}/gcc-${pkgver}/COPYING.RUNTIME \
    ${pkgdir}/usr/share/licenses/$pkgname/RUNTIME.LIBRARY.EXCEPTION

  # create symlinks
  cd ${pkgdir}/usr/bin
  rm ${CHOST}-gcc-${pkgver}
  for ii in c++ cpp g++ gcc gcc-ar gcc-nm gcc-ranlib gfortran; do
    ln -s ${ii}-${_pkgver} ${ii}-${pkgver}
    ln -s ${CHOST}-${ii}-${_pkgver} ${CHOST}-${ii}-${pkgver}
  done
  ln -s gcov-${_pkgver} gcov-${pkgver}

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