Changing default compiler on OpenSuSE

Posting this here because now it matters. By default OpenSuSE appears to 
install gcc-7 and cpp-7.
After you install version 11 of both via the package manager you still have 
a bit of work to do.

roland@localhost:~> su -
Password: 
localhost:~ # update-alternatives --install /usr/bin/gcc gcc 
/usr/bin/gcc-11 50
update-alternatives: using /usr/bin/gcc-11 to provide /usr/bin/gcc (gcc) in 
auto mode
localhost:~ # update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 
20
localhost:~ # update-alternatives --install /usr/bin/cpp cpp 
/usr/bin/cpp-11 50
update-alternatives: using /usr/bin/cpp-11 to provide /usr/bin/cpp (cpp) in 
auto mode
localhost:~ # update-alternatives --install /usr/bin/cpp cpp /usr/bin/cpp-7 
20
localhost:~ # 
localhost:~ # update-alternatives --config gcc
There are 2 choices for the alternative gcc (providing /usr/bin/gcc).

  Selection    Path             Priority   Status
------------------------------------------------------------
* 0            /usr/bin/gcc-11   50        auto mode
  1            /usr/bin/gcc-11   50        manual mode
  2            /usr/bin/gcc-7    20        manual mode

Press <enter> to keep the current choice[*], or type selection number: 
localhost:~ # update-alternatives --config cpp
There are 2 choices for the alternative cpp (providing /usr/bin/cpp).


  Selection    Path             Priority   Status
------------------------------------------------------------
* 0            /usr/bin/cpp-11   50        auto mode
  1            /usr/bin/cpp-11   50        manual mode
  2            /usr/bin/cpp-7    20        manual mode

Press <enter> to keep the current choice[*], or type selection number: 
localhost:~ # 

Should work on other Linux distros too. I don't know why they are still 
hanging back at 7 unless there is some kernel/core stuff that won't compile 
with newer compilers due to deprecation or later compilers forcing integer 
data types to be 2's complement. Real PITA for anyone working on a Unisys 
mainframe or doing low level device interfaces. 

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