Why doesn't Autotools makefile update Bash hash cache after install?

[Jeffrey Walton]

Hi Everyone,

After performing a 'make install', the Bash shell could still use the
old program because the Bash hash cache was not updated for the
program. 'which' will show the expected program (say
/usr/local/bin/foo), but running 'foo' will result in the old program
(say /usr/bin/foo).

The results can be reproduced with a simple 'configure && make && sudo
make install'. There's nothing special going on. In fact, I suspect
this is probably the most common use case.

Why does Autotools produce a makefile which does _not_ update the
cache under Bash shells?

Jeff