gcc installation script for Centos6.6 (probably can be used for other distributions). It also installs dependencies like mpc, mpfr and gmp !NOTE: As of now this only works for installations with PREFIX=/usr/local

install_gcc.sh

#!/bin/bash

LOGFILE=/tmp/gcc_install.log

# $1 - package name
errorIf(){
if [ $? -ne 0 ]; then
  echo "Something was wrong with $1"
  exit 1
fi
}

################################################################################
################################# SCRIPT START #################################

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# only one param - gcc's source directory absolute location
if [ $# -ne 1 ]; then
  echo "Please give the gcc source directory as argument"
  exit 1
fi

if [ ! -d "$1" ]; then
  echo "gcc's source directory that you have passed doesn't exist!"
  exit 1
fi

SOURCE_DIR=${1%/}                     # get rid of '/' at the end of SOURCE_DIR
SOURCE_DIR_NAME=${SOURCE_DIR##*/}
cd ${SOURCE_DIR}/contrib/

################################################################################
################################# gmp, mpgr, mpc  ##############################
# this script assumes that you have ran download_prerequisites from gcc's contrib 
# dir and have gmp, mpgr, mpc downloaded (used download_prerequisites)
if [ ! -d gmp ] || [ ! -d mpfr ] || [ ! -d mpc ]; then
  echo "There is no gmp or mpfr or mpc directory in $(pwd). Please run download_prerequisites."
  exit 1
fi

echo "Installing gcc and dependencies. You can check the status and results in $LOGFILE"

#gmp
(
cd gmp && \
./configure --enable-shared --enable-static --prefix=/usr/local && \
make && make check && make install
) >$LOGFILE 2>&1
errorIf gmp
echo "gmp Installed!:)"

#mpfr
(
cd mpfr && \
./configure --enable-shared --enable-static --prefix=/usr/local --with-gmp=/usr/local && \
make && make check && make install
) >$LOGFILE 2>&1
errorIf mpfr
echo "mpfr Installed!:)"

#mpc
(
cd mpc && \
./configure --enable-shared --enable-static --prefix=/usr/local --with-gmp=/usr/local --with-mpfr=/usr/local && \
make && make check && make install
) >$LOGFILE 2>&1
errorIf mpc
echo "mpc Installed!:)"

echo /usr/local/lib/ >> /etc/ld.so.conf
echo /usr/local/lib64/ >> /etc/ld.so.conf
ldconfig

cd ../../
ulimit -s 32768 # for gcc tests
mkdir -p /usr/share/gdb/auto-load/usr/lib
mkdir -p gcc-build && cd gcc-build

# find mv .py command is due to this ldconfig error (gcc copies some .py files into /usr/local/lib64/)
# ldconfig: /usr/local/lib/../lib64/libstdc++.so.6.0.20-gdb.py is not an ELF file - it has the wrong magic bytes at the start.
(
../"$SOURCE_DIR_NAME"/configure --enable-shared --disable-bootstrap --enable-languages=c,c++ --enable-libgomp --enable-threads=posix --with-gmp=/usr/local --with-mpfr=/usr/local --with-mpc=/usr/local --with-fpmath=sse --disable-multilib && \
make && make install && \
find /usr/local/lib64 -iname "*.py" -exec mv {} /usr/share/gdb/auto-load/usr/lib/ \; && \
ldconfig
) >$LOGFILE 2>&1

echo "gcc from $SOURCE_DIR_NAME Installed!:)"

uninstall_gcc.sh

#!/bin/bash
#
# as a parameter to this script please input the build directory (where Makefile resides)

TEMP_INSTALL_DIR=/tmp/gccinst
LOGFILE=/tmp/gcc_uninstall.log

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# only one param - gcc's source directory absolute location
if [ $# -ne 1 ]; then
  echo "Please give the gcc build directory as argument (where Makefile resides)"
  exit 1
fi

if [ ! -d "$1" ]; then
  echo "gcc's source directory that you have passed doesn't exist!"
  exit 1
fi

SOURCE_DIR="$1"
[ -d $TEMP_INSTALL_DIR ] && rm -rf $TEMP_INSTALL_DIR && mkdir $TEMP_INSTALL_DIR
echo "Installing gcc in temp dir: $TEMP_INSTALL_DIR (to check which files have to be removed from the system)"

(
cd $SOURCE_DIR && \
make install DESTDIR=$TEMP_INSTALL_DIR && \
find $TEMP_INSTALL_DIR -type f | sed -e s,$TEMP_INSTALL_DIR,, | (while read F; do rm "$F"; done) && \
# the next line will remove dead symlinks in /usr/local/lib64
find /usr/local/lib64 | xargs -I {} bash -c "[ ! -e {} ] && rm -f {}" && \
rm -rf $TEMP_INSTALL_DIR && \
ldconfig
) >$LOGFILE 2>&1
echo "Done :)"