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--- nix:gcc [2016/04/22 14:10] – kauffman
+++ nix:gcc [2021/01/20 12:25] (current) – kauffman
@@ Line 1: / Line 1: @@
 ====== GCC ======
+===== GCC Versions that are already installed on CS infrastructure =====
+Usually, we install multiple versions. The default version of GCC probably won't be changed system wide... ever.
+We are now taking more advantage of environment modules. This means depending on when you read this you could load the version of GCC you want to use.
+<code>
+$ module --terse avail |grep gcc
+/etc/environment-modules/modules:
+gcc/4.9.4
+gcc/5.5.0
+gcc/6.5.0
+gcc/7.5.0
+gcc/8.4.0
+gcc/9.3.0
+gcc/10.2.0
+</code>
+<code>
+$ module load gcc/4.9.4
+</code>
+<code>
+$ echo "$PATH | $INCLUDE | $LD_LIBRARY_PATH | $MANPATH"
+/usr/local/gcc/4.9.4/bin:/home/kauffman3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/opt/puppetlabs/bin
+| /usr/local/gcc/4.9.4/include | /usr/local/gcc/4.9.4/lib |
+/usr/local/gcc/4.9.4/man:/usr/share/man
+</code>
+<code>
+$ gcc --version
+gcc (GCC) 4.9.4
+</code>
+<code>
+$ module unload gcc
+</code>
 ===== Building GCC in your home directory =====
 https://gcc.gnu.org/wiki/InstallingGCC
-Strap in cause this will take a while. You will want to prepare a sandwich and a drink once we start compiling.
+You will want to prepare a sandwich and a drink once we start compiling.
 ===== Requirements =====
   - About 6.5G of scratch space.
-  - 1.5G for the actual install. This means if you require a higher quota you will need to request this before proceeding.
+  - ~1G for the actual install. This means if you require a higher [[ techstaff:quota|quota]] you will need to request this before proceeding.
+You will want to use /var/tmp, /tmp, or /local as the place to checkout and build GCC.
 ==== Example ====
@@ Line 13: / Line 54: @@
 #!/bin/bash
-PREFIX=$HOME/usr/local/gcc/4.9.3
+gccversion='7.1.0'
+PREFIX="$HOME/.local/gcc/${gccversion}"
-# Building gcc in $HOME
+# Building gcc
+gccversionuc="${gccversion//./_}"
 INSTALLDIR=/tmp/$USER
@@ Line 21: / Line 64: @@
 cd $INSTALLDIR
-svn co svn://gcc.gnu.org/svn/gcc/tags/gcc_4_9_3_release gcc-4.9.3
+svn co svn://gcc.gnu.org/svn/gcc/tags/gcc_${gccversionuc}_release gcc-${gccversion}
-cd gcc-4.9.3
+cd gcc-${gccversion}
 ./contrib/download_prerequisites
 cd ../
 mkdir objdir
 cd objdir
-$PWD/../gcc-4.9.3/configure \
+$PWD/../gcc-${gccversion}/configure \
   --prefix=$PREFIX \
   --enable-languages=c,c++,fortran,go \
@@ Line 36: / Line 79: @@
 make install
-export PATH=$PREFIX/bin:$PATH
+# clean up
-export LD_LIBRARY_PATH=$PREFIX/lib:$LD_LIBRARY_PATH
+rm -r $INSTALLDIR/objdir
+export PATH=$HOME/$PREFIX/bin:$PATH
+export LD_LIBRARY_PATH=$HOME/$PREFIX/lib:$LD_LIBRARY_PATH
 echo "You should add the following to your .bashrc"
 echo "to make the exports permanent"
-echo "  export PATH=$PREFIX/bin:${PATH}"
+echo "  export PATH=\$HOME/$PREFIX/bin:\$PATH"
-echo "  export LD_LIBRARY_PATH=$PREFIX/lib:${LD_LIBRARY_PATH}"
+echo "  export LD_LIBRARY_PATH=\$HOME/$PREFIX/lib:\$LD_LIBRARY_PATH"
+</code>
+===== Troubleshooting =====
+==== 'module' command not found ====
+To resolve you may have to do the following:
+<code>
+source /etc/profile.d/modules.sh
 </code>