--- /dev/null
+From 1146bf07624b5820b942b84b68e66f0d3dd25914 Mon Sep 17 00:00:00 2001
+From: Ola Jeppsson <ola.jeppsson@gmail.com>
+Date: Mon, 7 Oct 2019 18:07:30 -0400
+Subject: [PATCH] configure: Fix cross-compilation errors
+
+AC_RUN_IFELSE does not work when cross-compiling so we need to provide
+fallback methods for those cases.
+
+I tried to use constructs that work with Autoconf 2.52.
+Alas, I wasn't able to generate a working build system with that version.
+
+Autoconf 2.58 / Automake 1.7.9 is the earliest combo that I could get
+to work (with and without this patch).
+Perhaps it's time for a slight bump for the required version numbers?
+
+Cross-compiles sucessfully against:
+riscv64-unknown-linux-gnu
+
+Downloaded from upstream PR:
+https://github.com/memcached/memcached/pull/552
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+---
+ configure.ac | 80 +++++++++++++++++++++++++++-------------------------
+ 1 file changed, 41 insertions(+), 39 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index fb78fc5..27dc939 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -264,23 +264,42 @@ return sizeof(void*) == 8 ? 0 : 1;
+ ],[
+ CFLAGS="-m64 $org_cflags"
+ ],[
+- AC_MSG_ERROR([Don't know how to build a 64-bit object.])
++ AC_MSG_ERROR([Don't know how to build a 64-bit object.])
++ ],[
++ dnl cross compile
++ AC_MSG_WARN([Assuming no extra CFLAGS are required for cross-compiling 64bit version.])
+ ])
+ fi
+
+ dnl If data pointer is 64bit or not.
+-AC_RUN_IFELSE(
+- [AC_LANG_PROGRAM([], [dnl
+-return sizeof(void*) == 8 ? 0 : 1;
+- ])
+-],[
+- have_64bit_ptr=yes
+-],[
++AC_CHECK_HEADERS([stdint.h])
++AS_IF([test -z "$have_64bit_ptr"],
++ [AC_RUN_IFELSE(
++ [AC_LANG_PROGRAM([], [return sizeof(void*) == 8 ? 0 : 1;])],
++ [have_64bit_ptr=yes ],
++ [have_64bit_ptr=no],
++ [dnl cross compile (this test requires C99)
++ AS_IF([test "x$ac_cv_header_stdint_h" = xyes],
++ [AC_COMPILE_IFELSE(
++ [AC_LANG_PROGRAM([
++ #include <stdint.h>
++ #if UINTPTR_MAX == 0xFFFFFFFFFFFFFFFFUL
++ /* 64 bit pointer */
++ #else
++ #error 32 bit pointer
++ #endif
++ ], [])],
++ [have_64bit_ptr=yes],
++ [have_64bit_ptr=no])],
++ [have_64bit_ptr=unknown])
++ ])
+ ])
+-
+-if test $have_64bit_ptr = yes; then
++AS_IF([test "$have_64bit_ptr" = "unknown" ],[
++ AC_MSG_ERROR([Cannot detect pointer size. Must pass have_64bit_ptr={yes,no} to configure.])
++])
++AS_IF([test "$have_64bit_ptr" = yes],[
+ AC_DEFINE(HAVE_64BIT_PTR, 1, [data pointer is 64bit])
+-fi
++])
+
+ # Issue 213: Search for clock_gettime to help people linking
+ # with a static version of libevent
+@@ -570,30 +589,10 @@ fi
+ AC_C_SOCKLEN_T
+
+ dnl Check if we're a little-endian or a big-endian system, needed by hash code
+-AC_DEFUN([AC_C_ENDIAN],
+-[AC_CACHE_CHECK(for endianness, ac_cv_c_endian,
+-[
+- AC_RUN_IFELSE(
+- [AC_LANG_PROGRAM([], [dnl
+- long val = 1;
+- char *c = (char *) &val;
+- exit(*c == 1);
+- ])
+- ],[
+- ac_cv_c_endian=big
+- ],[
+- ac_cv_c_endian=little
+- ])
+-])
+-if test $ac_cv_c_endian = big; then
+- AC_DEFINE(ENDIAN_BIG, 1, [machine is bigendian])
+-fi
+-if test $ac_cv_c_endian = little; then
+- AC_DEFINE(ENDIAN_LITTLE, 1, [machine is littleendian])
+-fi
+-])
+-
+-AC_C_ENDIAN
++AC_C_BIGENDIAN(
++ [AC_DEFINE(ENDIAN_BIG, 1, [machine is bigendian])],
++ [AC_DEFINE(ENDIAN_LITTLE, 1, [machine is littleendian])],
++ [AC_MSG_ERROR([Cannot detect endianness. Must pass ac_cv_c_bigendian={yes,no} to configure.])])
+
+ AC_DEFUN([AC_C_HTONLL],
+ [
+@@ -670,12 +669,15 @@ AC_DEFUN([AC_C_ALIGNMENT],
+ ],[
+ ac_cv_c_alignment=need
+ ],[
+- ac_cv_c_alignment=need
++ dnl cross compile
++ ac_cv_c_alignment=maybe
+ ])
+ ])
+-if test $ac_cv_c_alignment = need; then
+- AC_DEFINE(NEED_ALIGN, 1, [Machine need alignment])
+-fi
++AS_IF([test $ac_cv_c_alignment = need],
++ [AC_DEFINE(NEED_ALIGN, 1, [Machine need alignment])])
++AS_IF([test $ac_cv_c_alignment = maybe],
++ [AC_MSG_WARN([Assuming aligned access is required when cross-compiling])
++ AC_DEFINE(NEED_ALIGN, 1, [Machine need alignment])])
+ ])
+
+ AC_C_ALIGNMENT
+--
+2.20.1
+
--- /dev/null
+From ec7f3bc97c53578d5ca332b9e86c4d08d155c5a0 Mon Sep 17 00:00:00 2001
+From: Ola Jeppsson <ola.jeppsson@gmail.com>
+Date: Mon, 7 Oct 2019 19:57:46 -0400
+Subject: [PATCH] configure: Simplify pointer size check
+
+Tested with:
+Autoconf 2.59 / Automake 1.7.9
+Autoconf 2.69 / Automake 1.16.1
+
+Downloaded from upstream PR:
+https://github.com/memcached/memcached/pull/552
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+---
+ configure.ac | 31 ++-----------------------------
+ restart.h | 2 +-
+ 2 files changed, 3 insertions(+), 30 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 27dc939..7e5bd5d 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -271,35 +271,8 @@ return sizeof(void*) == 8 ? 0 : 1;
+ ])
+ fi
+
+-dnl If data pointer is 64bit or not.
+-AC_CHECK_HEADERS([stdint.h])
+-AS_IF([test -z "$have_64bit_ptr"],
+- [AC_RUN_IFELSE(
+- [AC_LANG_PROGRAM([], [return sizeof(void*) == 8 ? 0 : 1;])],
+- [have_64bit_ptr=yes ],
+- [have_64bit_ptr=no],
+- [dnl cross compile (this test requires C99)
+- AS_IF([test "x$ac_cv_header_stdint_h" = xyes],
+- [AC_COMPILE_IFELSE(
+- [AC_LANG_PROGRAM([
+- #include <stdint.h>
+- #if UINTPTR_MAX == 0xFFFFFFFFFFFFFFFFUL
+- /* 64 bit pointer */
+- #else
+- #error 32 bit pointer
+- #endif
+- ], [])],
+- [have_64bit_ptr=yes],
+- [have_64bit_ptr=no])],
+- [have_64bit_ptr=unknown])
+- ])
+-])
+-AS_IF([test "$have_64bit_ptr" = "unknown" ],[
+- AC_MSG_ERROR([Cannot detect pointer size. Must pass have_64bit_ptr={yes,no} to configure.])
+-])
+-AS_IF([test "$have_64bit_ptr" = yes],[
+- AC_DEFINE(HAVE_64BIT_PTR, 1, [data pointer is 64bit])
+-])
++dnl Check if data pointer is 64bit or not
++AC_CHECK_SIZEOF([void *])
+
+ # Issue 213: Search for clock_gettime to help people linking
+ # with a static version of libevent
+diff --git a/restart.h b/restart.h
+index 76cd0a8..9de5096 100644
+--- a/restart.h
++++ b/restart.h
+@@ -4,7 +4,7 @@
+ #define RESTART_TAG_MAXLEN 255
+
+ // Track the pointer size for restart fiddling.
+-#ifdef HAVE_64BIT_PTR
++#if SIZEOF_VOID_P == 8
+ typedef uint64_t mc_ptr_t;
+ #else
+ typedef uint32_t mc_ptr_t;
+--
+2.20.1
+
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