[Bug other/91879] --with-build-time-tools doesn't work as expected

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91879

--- Comment #18 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
No, --with-build-time-tools definitely should not override newly built 
tools.

For example, in some bootstrap configurations you have to build GCC more 
than once.  If you're also installing into a DESTDIR rather than directly 
into the configured prefix, you need to use --with-build-time-tools so 
that binutils for the target can be found.  But when building the second 
GCC, the newly built GCC *must* be used to compile its own shared 
libraries, not the first-stage GCC that might be installed alongside 
binutils in the directory pointed to with --with-build-time-tools.  (For 
example, the second GCC might be configured --enable-shared, with that 
being needed to build shared libgcc and libstdc++, where the first GCC was 
configured --disable-shared.)