install-deps.sh: use gcc-12 for ubuntu jammy

Clang relies on the system's libstdc++ headers for standard C++
features. On Ubuntu Jammy, gcc-11 is the default and it's libstdc++ is
missing some of the newer features supported by C++20.

This causes build failures as certain standard headers are incomplete.
To fix this, we install gcc-12 explicitly so that Clang can pick up the
newer libstdc++ headers.

Signed-off-by: Aishwarya Mathuria <[email protected]>

Author: amathuria

install-deps.sh

@@ -426,8 +426,9 @@ else
                 [ ! $NO_BOOST_PKGS ] && install_boost_on_ubuntu focal
                 ;;
             *Jammy*)
-                [ ! $NO_BOOST_PKGS ] && install_boost_on_ubuntu jammy
                 $SUDO apt-get install -y gcc
+		ensure_decent_gcc_on_ubuntu 12 jammy
+                [ ! $NO_BOOST_PKGS ] && install_boost_on_ubuntu jammy
                 ;;
             *)
                 $SUDO apt-get install -y gcc