From 316b81c462f065927d7fec56aadd5c8cb94d1cf0 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 | 30 ------------------------------
 1 file changed, 30 deletions(-)

diff --git a/configure.in b/configure.in
index 3663220..dce9789 100644
--- a/configure.in
+++ b/configure.in
@@ -1303,36 +1303,6 @@ 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_CACHE_CHECK([for mmap that can map /dev/zero],
-    [ac_cv_mmap__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])])
-fi
-
 # Now we determine which one is our anonymous shmem preference.
 haveshmgetanon="0"
 havemmapzero="0"