support/scripts: fix RPATH fixups

Commit a87abcf6da65 (Makefile: run PPD and RPATH fixup in host-fialize)
(sic) moved the fixups peviously done in prepare-sdk, to host-finalize.

This exposed a bug in fix-rpath, when RPATH contains multiple entries,
like:  /PPD/host-foo/host/lib:/PPD/host-foo/host/lib/foo

In that situation, we want to get rid of /PPD/host-foo and replace it
with the finale HOST_DIR, so we mangle the RPATH with a sed expression.

However, that sed expression only ever replaces the first match, as it
is missing the 'g' option. Thus, the second (and following) parts of
RPATH are still referring to the PPD, and thus patchelf does not find it
relative to the final HOST_DIR, amd rops it. This eventually lead to a
final RPATH set as $ORIGIN/../lib instead of the expected
$ORIGIN/../lib:$ORIGIN/../lib/foo

This is the case for host-systemd, which installs some of its libraries
in $PREFIX/lib/systemd/ and adds an RPATH set appropriately to
/PPD/host-systemd/host/lib:/PPD/host-systemd/host/lib/systemd and that
gets incorrectly mangled.

Fixes: https://gitlab.com/buildroot.org/buildroot/-/issues/39

Also fix a typo in the comment just above.

Reported-by: José Luis Salvador Rufo @jlsalvador
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Tested-by: José Luis Salvador Rufo <salvador.joseluis@gmail.com>
Reviewed-by: José Luis Salvador Rufo <salvador.joseluis@gmail.com>
Tested-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Reviewed-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/scripts/fix-rpath

@@ -84,9 +84,9 @@ patch_file() {
     # work with the --make-rpath-relative ${rootdir} invocation as
     # the per-package host directory is not within ${rootdir}. So,
     # we rewrite all RPATHs pointing to per-package directories so
-    # that they point to the global host directry.
+    # that they point to the global host directory.
     # shellcheck disable=SC2001 # ${var//search/replace} hard when search or replace have / in them
-    changed_rpath="$(echo "${rpath}" | sed "s@${PER_PACKAGE_DIR}/[^/]\+/host@${HOST_DIR}@")"
+    changed_rpath="$(echo "${rpath}" | sed "s@${PER_PACKAGE_DIR}/[^/]\+/host@${HOST_DIR}@g")"
     if test "${rpath}" != "${changed_rpath}" ; then
         "${PATCHELF}" --set-rpath "${changed_rpath}" "${file}"
     fi