None of the shells offered to start an environment add C or other compilers in path

[csrabak]

In version of Rtool 4.3, running be it Rtools43 bash, Msys{32,64}.exe, Mingw{32,64}.exe, etc., do not put the dev tools in the path.

For example, running the Rtools43 bash from the desktop shortcut produces:

MSYS ~
$ which gcc
which: no gcc in (/usr/local/bin:/usr/bin:/bin:/opt/bin:/c/Windows/System32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/c/progra~1/git/cmd:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)

 MSYS ~
$

On the other hand, the docs material is explicit:

The mingw32/mingw64 shell automatically put the respective gcc version on the path, whereas the msys shell has no toolchain on the path.