GCC Toolset 12 Software Collection Bootstrap Instructions:
(by Skip Grube // 2022-10-01)


1. Have a proper SCL-enabled Mock config:
  - Need to include "scl-utils-build" in the buildroot (['chroot_setup_cmd']).  This includes the necessary SCL macros
  
  

2. Obtain the source RPM packages:  
  gcc-toolset-12
  gcc-toolset-12-annobin
  gcc-toolset-12-binutils
  gcc-toolset-12-dwz
  gcc-toolset-12-gdb
  gcc-toolset-12-gcc
  

3.  Modify the gcc-toolset-12-binutils .spec file, and produce a BOOTSTRAP-gcc-toolset-12-binutils SRPM
  - The spec file tells you what to do, circa Line 317
  - Need to remove the scl macros from some BuildRequires, so it uses the system's default gcc/g++/annobin.  This is just to get it going before building the final version
  - So now there are 2 binutils SRPMs:  The bootstrap (uses non-SCL BuildRequires), and the real one
  

4. Build gcc-toolset-12 macro/metapackage
  - Be sure to include scl-utils-build
  - Should be a very fast build
  - Produces important package: "gcc-toolset-12-build"
  - IMPORTANT: gcc-toolset-12-build MUST now be added to the Mock config for building the rest of the packages (alongside scl-utils-build)


5. Bootstrap builds.  Build in order.  Each resulting packages must be available to subsequent builds:
   dwz
   gdb
   binutils(bootstrap)
   gcc
   annobin
   binutils 

  - The bootstrap binutils can be discarded at the end of the proces



6.  Final/actual builds.  Build in order, with the bootstrap results available to these builds: 
  dwz
  gcc
  annobin
  gdb
  binutils