tcmode: filter out default cs intall paths from PATH

The toolchain installer can end up modifying the user's PATH via their
dotfiles, but if the ia32 sourcery g++ toolchain is always in the user's path,
things can fail to build, as the ia32 toolchain provides non-prefixed binaries
(e.g. 'gcc', 'ld').

Signed-off-by: Christopher Larson <chris_larson@mentor.com>

conf/distro/include/tcmode-external-sourcery.inc

@@ -99,6 +99,14 @@ python toolchain_metadata_setup () {
     l.finalize()
     oe_import(l)
 
+    # Remove already-added toolchain install paths from the PATH, as they can
+    # break the build (in particular, the ia32 toolchain, as it provdes
+    # non-prefixed binaries).
+    install_prefix_default = bb.data.expand('${HOME}/CodeSourcery/', l)
+    path = d.getVar('PATH', True).split(':')
+    path = filter(lambda p: not p.startswith(install_prefix_default), path)
+    d.setVar('PATH', ':'.join(path))
+
     external_toolchain = l.getVar('EXTERNAL_TOOLCHAIN', True)
     if not external_toolchain or external_toolchain == 'UNDEFINED':
         bb.fatal("Error: EXTERNAL_TOOLCHAIN must be set to the path to your sourcery toolchain")