Script to build GCC 4.7.x on newer Linux distributions (using

build-gcc-4.7.sh

#!/bin/bash

#Download source
wget http://mirrors.concertpass.com/gcc/releases/gcc-4.7.2/gcc-4.7.2.tar.bz2
tar xvfj gcc-4.7.2.tar.bz2

cd gcc-4.7.2
./contrib/download_prerequisites

#Download and apply fix to be able to build GCC 4.7 with GCC 5.x
wget https://patchwork.ozlabs.org/patch/504982/raw/ -O cfns-fix-mismatch-in-gnu_inline-attributes.patch
patch -p1 -i cfns-fix-mismatch-in-gnu_inline-attributes.patch

#Edit files to prevent errors with newer version of texinfo
sed -i "s|@itemx --help|@item -help|ig" gcc/doc/cppopts.texi
sed -i "s|@itemx -fenable-@var{kind}-@var{pass}|@item -fenable-@var{kind}-@var{pass}|ig" gcc/doc/invoke.texi #5182
sed -i "s|@itemx -fdump-rtl-cprop_hardreg|@item -fdump-rtl-cprop_hardreg|ig" gcc/doc/invoke.texi             #5330
sed -i "s|@itemx -fdump-rtl-csa|@item -fdump-rtl-csa|ig" gcc/doc/invoke.texi                                 #5334
sed -i "s|@itemx -fdump-rtl-dce|@item -fdump-rtl-dce|ig" gcc/doc/invoke.texi                                 #5345
sed -i "s|@itemx -fdump-rtl-dbr|@item -fdump-rtl-dbr|ig" gcc/doc/invoke.texi                                 #5349
sed -i "s|@itemx -fdump-rtl-into_cfglayout|@item -fdump-rtl-into_cfglayout|ig" gcc/doc/invoke.texi           #5394
sed -i "s|@itemx -fdump-rtl-outof_cfglayout|@item -fdump-rtl-outof_cfglayout|ig" gcc/doc/invoke.texi         #5424
sed -i "s|@itemx -fdump-rtl-pro_and_epilogue|@item -fdump-rtl-pro_and_epilogue|ig" gcc/doc/invoke.texi       #5436
sed -i "s|@itemx POINTER_PLUS_EXPR|@item POINTER_PLUS_EXPR|ig" gcc/doc/generic.texi
sed -i "s|@itemx PLUS_EXPR|@item PLUS_EXPR|ig" gcc/doc/generic.texi

cd ..
mkdir objdir
cd objdir

../gcc-4.7.2/configure --enable-bootstrap --enable-languages=c,c++,fortran --prefix=/opt/apps/rhel7/gcc-4.7.2 --with-ppl=/opt/apps/rhel7/ppl-1.2  --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --disable-libgcj --with-arch_32=i686 --build=x86_64-redhat-linux
make

#install
sudo make install

#check the install
/usr/bin/gcc --version

/opt/apps/rhel7/gcc-4.7.2/bin/gcc --version

#delete directory
cd ..
rm -rf objdir

Hi tyler,
The link https://patchwork.ozlabs.org/patch/504982/raw/ seems unavailable now. Could you please put the contents directory into github?

Whether i just replace the cfns.gperf under the gcc-4.7.2/gcc/cp/ with the new one under gcc-5.y.z/gcc/cp is ok?

Br.
Ting

@tingaxio I don't see a problem with that line of code. I just ran it and it worked fine for me.

@tyleransom
May be it is my network issues. Anyway , thanks all the same.

I've tried remove the gcc under /usr/local/bin first and then remove the default gcc-4.4.7-23.el6.x86_64 using
sudo yum remove gcc
and then re-install the default gcc again using
sudo yum install gcc

After that the gcc comes back to 4.4.7. Then I can upgrade it to 4.7.2 by compiling the source. It did work in centos 6.x

Glad to hear it worked out.