./configure ... --with-build-time-tools=$MY_TOOLS ignores $MY_TOOLS (though it correctly warns when $MY_TOOLS is not an absolute path).
Let's just say this led to extremely frustrating behavior until I decided to start digging... Suggested patch to correct the problem: Index: /home/Ryan/apps/gcc-4.5-src/configure.ac =================================================================== --- /home/Ryan/apps/gcc-4.5-src/configure.ac (revision 157227) +++ /home/Ryan/apps/gcc-4.5-src/configure.ac (working copy) @@ -3221,7 +3221,9 @@ [ --with-build-time-tools=PATH use given path to find target tools during the build], [case x"$withval" in - x/*) ;; + x/*) + with_build_time_tools=$withval + ;; *) with_build_time_tools= AC_MSG_WARN([argument to --with-build-time-tools must be an absolute path]) -- Summary: top-level configure script ignores ---with-build-time- tools Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: scovich at gmail dot com GCC host triplet: i686-pc-cygwin GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43301