Tested x86_64-pc-linux-gnu, applying to trunk.

-- 8< --

We don't want a warning about a reserved init_priority in a system header
even with -Wsystem-headers.

gcc/cp/ChangeLog:

        * tree.cc (handle_init_priority_attribute): Check
        in_system_header_at.
---
 gcc/cp/tree.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/tree.cc b/gcc/cp/tree.cc
index 99088da9cee..f43febed124 100644
--- a/gcc/cp/tree.cc
+++ b/gcc/cp/tree.cc
@@ -5196,7 +5196,8 @@ handle_init_priority_attribute (tree* node,
 
   /* Check for init_priorities that are reserved for
      language and runtime support implementations.*/
-  if (pri <= MAX_RESERVED_INIT_PRIORITY)
+  if (pri <= MAX_RESERVED_INIT_PRIORITY
+      && !in_system_header_at (input_location))
     {
       warning
        (0, "requested %<init_priority%> %i is reserved for internal use",

base-commit: 005f7176e0f457a1e1a7398ddcb4a4972da28c62
-- 
2.46.0

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