py/misc: Don't warn about a GNU extension for static assert macro.

This warning was enabled by default on clang 17.0.0 on macOS 26.  Disable
it, because we want to make these checks at compile-time even if it
requires an extension.

Fixes issue #18116.

Signed-off-by: Jeff Epler <jepler@unpythonic.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/py/misc.h b/py/misc.h
index ab40d3d98..67248ac2f 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -83,6 +83,9 @@ typedef unsigned int uint;
 #if defined(_MSC_VER) || defined(__cplusplus)
 #define MP_STATIC_ASSERT_NONCONSTEXPR(cond) ((void)1)
 #else
+#if __clang__
+#pragma GCC diagnostic ignored "-Wgnu-folding-constant"
+#endif
 #define MP_STATIC_ASSERT_NONCONSTEXPR(cond) ((void)sizeof(char[1 - 2 * !(cond)]))
 #endif