pkg/55625: /usr/bin/gcc version stuck at 7 when gcc 8 or later is installed

[bruce.lilly+nbsd%gmail.com@localhost]

>Number:         55625
>Category:       pkg
>Synopsis:       /usr/bin/gcc version stuck at 7 when gcc 8 or later is installed
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Aug 29 16:10:01 +0000 2020
>Originator:     Bruce Lilly
>Release:        9.0
>Organization:
>Environment:
NetBSD cq60-615dx.blilly.net 9.0 NetBSD 9.0 (GENERIC) #0: Fri Feb 14 00:06:28 UTC 2020  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64 x86_64 Intel 686-class NetBSD
>Description:
If gcc version 7 and gcc > 7 is installed, /usr/bin/gcc uses version 7:
# /usr/bin/gcc --version
gcc (nb3 20190319) 7.4.0
...
>How-To-Repeat:
Fresh install (not upgrade) of NetBSD 9.0
Install gcc7 and gcc8 or later (see pkg/55623)
plain `gcc' uses gcc7 only
>Fix:
I do the following:
1. PATH is arranged to include the relevant gcc bin directories so that the most recent version of gcc and related tools appears first, e.g.
   ... /usr/pkg/gcc10/bin:/usr/pkg/gcc9/bin:/usr/pkg/gcc8/bin:/usr/pkg/gcc7/bin:/usr/pkg/gcc6/bin:/usr/pkg/gcc5/bin:/usr/pkg/gcc49/bin:/usr/pkg/gcc48/bin:/usr/pkg/gcc3/bin ...
   These appear before /usr/bin in $PATH, so that the stuck version in /usr/bin/gcc doesn't hinder using more recent versions.
2. I install links so that specific versions can be specified:
lrwxr-xr-x  1 root  wheel    16 Aug 21 21:29 /usr/pkg/bin/gcc10 -> ../gcc10/bin/gcc
lrwxr-xr-x  1 root  wheel    15 Aug 21 21:29 /usr/pkg/bin/gcc3 -> ../gcc3/bin/gcc
lrwxr-xr-x  1 root  wheel    16 Aug 21 21:29 /usr/pkg/bin/gcc48 -> ../gcc48/bin/gcc
lrwxr-xr-x  1 root  wheel    16 Aug 21 21:29 /usr/pkg/bin/gcc49 -> ../gcc49/bin/gcc
lrwxr-xr-x  1 root  wheel    15 Aug 21 21:29 /usr/pkg/bin/gcc5 -> ../gcc5/bin/gcc
lrwxr-xr-x  1 root  wheel    15 Aug 21 21:29 /usr/pkg/bin/gcc6 -> ../gcc6/bin/gcc
lrwxr-xr-x  1 root  wheel    15 Aug 21 21:29 /usr/pkg/bin/gcc7 -> ../gcc7/bin/gcc
lrwxr-xr-x  1 root  wheel    15 Aug 21 21:29 /usr/pkg/bin/gcc8 -> ../gcc8/bin/gcc
lrwxr-xr-x  1 root  wheel    15 Aug 21 21:29 /usr/pkg/bin/gcc9 -> ../gcc9/bin/gcc

Notes: 
 1. It may be useful to include links such as the above in the relevant packages
 2. Don't blame me for the wacky gcc version numbering