[gcc r17-1419] testsuite: get a predictable ordered array for comparison

[Torbjorn Svensson]

https://gcc.gnu.org/g:050c632327e4c499c66d4d258763a7b846a53134

commit r17-1419-g050c632327e4c499c66d4d258763a7b846a53134
Author: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
Date:   Tue Apr 7 14:32:46 2026 +0200

    testsuite: get a predictable ordered array for comparison
    
    Without this patch, errors like below can be seen in g++.log:
    
    Traceback (most recent call last):
      File "/build/gcc_src/gcc/testsuite/g++.dg/modules/test-p1689.py", line 220, in <module>
        is_ok = validate_p1689(actual, expect)
    ...
      File "/build/gcc_src/gcc/testsuite/g++.dg/modules/test-p1689.py", line 149, in compare_json
        actual = set(actual)
    TypeError: unhashable type: 'dict'
    
    To avoid hashing dicts, transform the elements to string representation
    prior to sorting the array and then transform back to objects after.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/modules/test-p1689.py: Make arrays have predictable
            order.
    
    Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>

Diff:
---
 gcc/testsuite/g++.dg/modules/test-p1689.py | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/g++.dg/modules/test-p1689.py b/gcc/testsuite/g++.dg/modules/test-p1689.py
index 2f07cc361aaf..b9cb3ebfc323 100644
--- a/gcc/testsuite/g++.dg/modules/test-p1689.py
+++ b/gcc/testsuite/g++.dg/modules/test-p1689.py
@@ -131,6 +131,16 @@ def _inspect_ordering(arr):
 
     return arr, req_ordering
 
+def _get_predictable_ordered_array(arr):
+    if not arr:
+        return arr
+
+    # Convert to list of string to get predictable order.
+    # Using set() here causes issue with complex arrays
+    arr = [json.dumps(x) for x in arr]
+    arr.sort()
+    return [json.loads(x) for x in arr]
+
 
 def compare_json(path, actual, expect):
     actual_type = type(actual)
@@ -146,8 +156,8 @@ def compare_json(path, actual, expect):
     elif actual_type == list:
         expect, req_ordering = _inspect_ordering(expect)
         if not req_ordering:
-            actual = set(actual)
-            expect = set(expect)
+            actual = _get_predictable_ordered_array(actual)
+            expect = _get_predictable_ordered_array(expect)
         is_ok = _compare_array(path, actual, expect)
     elif actual_type == str:
         is_ok = _compare_string(path, actual, expect)