Applying to trunk.

-- 8< --

Previously, if the common ancestor of the two paths is / we would print the
absolute second argument, but this PR asks for a relative path in that case
as well, which makes sense for the libstdc++.modules.json use case.

        PR libstdc++/119081

contrib/ChangeLog:

        * relpath.sh: Give relative path even at /.
---
 contrib/relpath.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/contrib/relpath.sh b/contrib/relpath.sh
index ac6b769ef81..1b329fc04a7 100755
--- a/contrib/relpath.sh
+++ b/contrib/relpath.sh
@@ -59,9 +59,9 @@ while [ "${to#$from}" = "$to" ]; do
     from=$(dirname $from);
     back=../$back
 
-    if [ "$from" = "/" ]; then
-       echo $to
-       exit 0
+    if [ "$from" = / ] && [ "${to#/}" = "$to" ]; then
+       echo no common ancestor between $1 and $2 >&2
+       exit 1
     elif [ "$from" = . ]; then
        echo no common ancestor between $1 and $2 >&2
        exit 1

base-commit: 445128c12cf22081223f7385196ee3889ef4c4b2
-- 
2.48.1

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