From 2ac63f8765e62f1492ef3ee06791636700bc6cfb Mon Sep 17 00:00:00 2001
From: triallax <triallax@tutanota.com>
Date: Sat, 29 Jun 2024 15:25:24 +0100
Subject: [PATCH] Cast offset to size_t to avoid c++11-narrowing warning (#92)

e.g. with clang 18 on chimera linux:

_CFFI_test_verify_anonymous_struct_with_star_typedef.cpp:583:10: error: non-constant-expression cannot be narrowed from type 'long' to 'size_t' (aka 'unsigned long') in initializer list [-Wc++11-narrowing]
  583 |   { "a", ((char *)&((foo_t)4096)->a) - (char *)4096,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
_CFFI_test_verify_anonymous_struct_with_star_typedef.cpp:583:10: note: insert an explicit cast to silence this issue
  583 |   { "a", ((char *)&((foo_t)4096)->a) - (char *)4096,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |          static_cast<size_t>(                      )

Upstream-Status: Backport [https://github.com/python-cffi/cffi/pull/92]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 src/cffi/recompiler.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cffi/recompiler.py b/src/cffi/recompiler.py
index ac6c163e..14d578ee 100644
--- a/src/cffi/recompiler.py
+++ b/src/cffi/recompiler.py
@@ -953,7 +953,7 @@ class Recompiler:
                 if cname is None or fbitsize >= 0:
                     offset = '(size_t)-1'
                 elif named_ptr is not None:
-                    offset = '((char *)&((%s)4096)->%s) - (char *)4096' % (
+                    offset = '(size_t)(((char *)&((%s)4096)->%s) - (char *)4096)' % (
                         named_ptr.name, fldname)
                 else:
                     offset = 'offsetof(%s, %s)' % (tp.get_c_name(''), fldname)
