Hey there! Let's figure out how to install GCC 7.3 on Ubuntu 16.04, since we know the official Ubuntu Toolchain only offers 7.2 and Jonathan F's pre-built amd64 package is failing. Here are a couple of straightforward ways to get it done:

Option 1: Compile from Source (Most Reliable) #

Since working pre-built packages are hard to come by for this specific version and distro, compiling from source is a solid bet—and it's not as complicated as it sounds. Here's how:

• First, install all the dependencies needed to build GCC:

  sudo apt update && sudo apt install -y build-essential libmpc-dev libmpfr-dev libgmp-dev flex bison
  

• Download the GCC 7.3.0 source code from the official GNU GCC archives, then extract it and navigate into the source directory:

  tar -xf gcc-7.3.0.tar.gz
  cd gcc-7.3.0
  

• Set up a separate build directory (keeps your source files clean) and configure the build. We'll install it to /usr/local/gcc-7.3 so it doesn't overwrite your system's default GCC:

  mkdir build && cd build
  ../configure --prefix=/usr/local/gcc-7.3 --enable-languages=c,c++ --disable-multilib
  

• Start compiling. The -j$(nproc) flag uses all your CPU cores to speed things up—this might take 15-30 minutes depending on your hardware:

  make -j$(nproc)
  sudo make install
  

• To use this GCC version by default, add it to your shell's PATH (skip this if you want to keep the system GCC as your default):

  echo 'export PATH=/usr/local/gcc-7.3/bin:$PATH' >> ~/.bashrc
  echo 'export LD_LIBRARY_PATH=/usr/local/gcc-7.3/lib64:$LD_LIBRARY_PATH' >> ~/.bashrc
  source ~/.bashrc
  

• Verify the installation worked:

  gcc --version
  

  You should see output showing gcc (GCC) 7.3.0.

Option 2: Check for Alternative Third-Party PPAs #

While Jonathan F's build is broken, there's a slim chance another trusted PPA has a working build. Before diving into compiling, you can try this quick check:

• Install the tools needed to add PPAs:

  sudo apt install -y software-properties-common
  

• Add the Ubuntu Toolchain test PPA (sometimes they have newer versions than the main repo, though it might still only have 7.2 for 16.04):

  sudo add-apt-repository ppa:ubuntu-toolchain-r/test
  sudo apt update
  

• Try installing GCC 7.3:

  sudo apt install -y gcc-7.3 g++-7.3
  

If this works, great! If not, fall back to the source compilation method above—it's guaranteed to work as long as you have enough disk space and CPU power.

内容的提问来源于stack exchange，提问作者WillZ