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+An overview of steps required to switch to a new GCC version.
+
+1. Get the MinGW build of this version and get configuration
+   flags (gcc -v). The idea is to build both the cross-compiler
+   and the native compiler (with linked-in ODB plugin) as close
+   to the MinGW configuration as possible.
+
+2. Build the cross-compiler:
+
+   1. Backup old cross/mingw to cross/mingw-X.Y.Z.
+   2. Cleanup old GCC files from cross/mingw.
+   3. Unpack GCC, rename to gcc-cross, create or clean gcc-cross-build.
+   4. Adapt older gcc-X.Y.Z-mingw-cross.patch (--dry-run) and apply.
+   5. Adapt gcc-cross-configure.
+   6. Build & install:
+
+      cd gcc-cross-build
+      ../gcc-cross-configure
+      make -j 16
+      make install
+
+   7. Clean up .so & .la files from cross/mingw/lib/gcc/i686-mingw/X.Y.Z
+      (we still seem to have to build with --enable-shared for exceptions
+       to work).
+   8. Check that the compiler works. Compile and run sizeof_funds.cxx and
+      throw.cxx. There should be no auto-importing (see step 7).
+
+3. Build the native compiler:
+
+  1. Unpack GCC, rename to gcc, create or clean gcc-build.
+  2. Adapt older gcc-X.Y.Z-mingw.patch (--dry-run) and apply.
+  3. Adapt older gcc-X.Y.Z-static-plugin.patch (--dry-run) and apply.
+     This step will probably require careful review of changes in the
+     plugin code (plugin.h and plugin.c).
+  4. Regegerate configure script in gcc/gcc/. Use the same autoconf
+     version as in the original (see ~/build/autocond-X.Y). For example:
+
+     sudo make -C ~/build/autoconf-2.64 install
+     autoconf --version
+     cd gcc
+     autoconf
+     sudo make -C ~/build/autoconf-2.64 uninstall
+
+  4. Adapt gcc-configure.
+  5. Configure and make GCC manually:
+
+     export PATH=`pwd`/cross/mingw/bin:$PATH
+     cd gcc-build
+     ../gcc-configure
+     make -j 16
+
+     This step will fail due to lack of libplugin-stub.a. That's
+     ok. Copy .h and .def files from gcc-build/gcc/ to gcc-headers/
+     (backup old ones).
+
+4. Run the build-dist script with -rebuild
+
+   1. If GCC build fails, then it can be re-configured or re-made
+      directly from the gcc-build directory provided you don't
+      clean it up (if you do so, you can manually copy libplugin-stub.a
+      to gcc-build/gcc/).
+
+   2. Check the package for any stray directories/files.
+
+   3. On Windows, check that:
+
+      - Compiler, including exceptions, work. Compile and run sizeof_funds.cxx
+        and throw.cxx.
+
+      - Make sure ODB runs, including throwing exceptions (run on object
+        with private data members).
+
+5. Copy updates/patches to odb/etc/.