From ee728971fd9d2da39356f1574d58d5daa3b24520 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 26 Aug 2022 00:28:08 -0700
Subject: [PATCH] configure: Remove runtime test for mmap that can map
 /dev/zero

This never works for cross-compile moreover it ends up disabling
ac_cv_file__dev_zero which then results in compiler errors in shared
mutexes

Upstream-Status: Inappropriate [Cross-compile specific]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 configure.in | 32 --------------------------------
 1 file changed, 32 deletions(-)

diff --git a/configure.in b/configure.in
index a99049d..f1f55c7 100644
--- a/configure.in
+++ b/configure.in
@@ -1182,38 +1182,6 @@ AC_CHECK_FUNCS([mmap munmap shm_open shm_unlink shmget shmat shmdt shmctl \
 APR_CHECK_DEFINE(MAP_ANON, sys/mman.h)
 AC_CHECK_FILE(/dev/zero)
 
-# Not all systems can mmap /dev/zero (such as HP-UX).  Check for that.
-if test "$ac_cv_func_mmap" = "yes" &&
-   test "$ac_cv_file__dev_zero" = "yes"; then
-    AC_MSG_CHECKING(for mmap that can map /dev/zero)
-    AC_TRY_RUN([
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#ifdef HAVE_SYS_MMAN_H
-#include <sys/mman.h>
-#endif
-    int main()
-    {
-        int fd;
-        void *m;
-        fd = open("/dev/zero", O_RDWR);
-        if (fd < 0) {
-            return 1;
-        }
-        m = mmap(0, sizeof(void*), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
-        if (m == (void *)-1) {  /* aka MAP_FAILED */
-            return 2;
-        }
-        if (munmap(m, sizeof(void*)) < 0) {
-            return 3;
-        }
-        return 0;
-    }], [], [ac_cv_file__dev_zero=no], [ac_cv_file__dev_zero=no])
-
-    AC_MSG_RESULT($ac_cv_file__dev_zero)
-fi
-
 # Now we determine which one is our anonymous shmem preference.
 haveshmgetanon="0"
 havemmapzero="0"
-- 
2.37.2