From 51ba7166987d49ad39065d67308c8484251e97d7 Mon Sep 17 00:00:00 2001
From: Carl Shapiro <cshapiro@meta.com>
Date: Tue, 20 Jan 2026 18:56:32 -0800
Subject: [PATCH] Determine the page size on Android from NDK header files

The definition of the PAGE_SIZE macro is used as a signal for a 32-bit
target or a 64-bit target with an older NDK.  Otherwise, a 16KiB page
size is assumed.

Resolves jemalloc/jemalloc#2657
---
 configure.ac | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/configure.ac b/configure.ac
index 897f17198..376779b00 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1990,6 +1990,11 @@ case "${host}" in
         LG_PAGE=14
       fi
       ;;
+  *-*-linux-android)
+      if test "x$LG_PAGE" = "xdetect"; then
+	AC_CHECK_DECLS([PAGE_SIZE], [LG_PAGE=12], [LG_PAGE=14], [#include <sys/user.h>])
+      fi
+      ;;
   aarch64-unknown-linux-*)
       if test "x$LG_PAGE" = "xdetect"; then
         LG_PAGE=16