python · vstinner · May 7, 2026 · May 7, 2026
@@ -792,6 +792,8 @@ also be used to improve performance.
   - ``-marm`` and/or ``-mno-thumb`` is added on 32-bit ARM when supported,
   - on s390x platforms, when supported, ``-mbackchain`` is added *instead*.
     of the above frame pointer flags.
+   - on ppc64le platforms, no compiler flags is needed since the power ABI
+     requires that compilers maintain a back chain by default.

   Frame pointers enable profilers, debuggers, and system tracing tools
   (``perf``, ``eBPF``, ``dtrace``, ``gdb``) to walk the C call stack

diff --git a/Lib/test/test_frame_pointer_unwind.py b/Lib/test/test_frame_pointer_unwind.py
@@ -56,6 +56,12 @@ def _frame_pointers_expected(machine):
            if sys.maxsize < 2**32:
                return None
            return True
+        if machine == "ppc64le":
+            # The power ABI specification requires that compilers maintain a
+            # back chain by default, so unwinding already works without a
+            # dedicated frame pointer.
+            # https://openpowerfoundation.org/specifications/64bitelfabi/
+            return True
        if machine == "x86_64":
            final_opt = ""
            for opt in cflags.split():

@@ -2557,6 +2557,9 @@ AS_VAR_IF([ac_cv_gcc_compat], [yes], [
          frame_pointer_cflags="$frame_pointer_cflags -mno-thumb"
        ], [], [-Werror])
      ])
+      AS_CASE([$host_cpu], [powerpc64le], [
+        frame_pointer_cflags=""
+      ])
      AS_CASE([$host_cpu], [s390*], [
        AX_CHECK_COMPILE_FLAG([-mbackchain], [
          dnl Do not use no-omit-frame-pointer; see gh-149362