From: Michael Jeanson <mjeanson@efficios.com>
Date: Tue, 16 Apr 2019 20:17:30 +0000 (-0400)
Subject: Update macros from the autoconf archive
X-Git-Tag: v2.12.0-rc1~45
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=e465639ea30d128bc6dd59448a5bf6551a5da222;p=lttng-ust.git

Update macros from the autoconf archive

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/m4/ax_c___attribute__.m4 b/m4/ax_c___attribute__.m4
index cf3d62bb..6a1ede15 100644
--- a/m4/ax_c___attribute__.m4
+++ b/m4/ax_c___attribute__.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html
+#    https://www.gnu.org/software/autoconf-archive/ax_c___attribute__.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -28,7 +28,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -43,7 +43,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 8
+#serial 9
 
 AC_DEFUN([AX_C___ATTRIBUTE__], [
   AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__],
diff --git a/m4/ax_check_class.m4 b/m4/ax_check_class.m4
index 42b51d72..e673c2d3 100644
--- a/m4/ax_check_class.m4
+++ b/m4/ax_check_class.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_check_class.html
+#      https://www.gnu.org/software/autoconf-archive/ax_check_class.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -36,7 +36,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -51,83 +51,18 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 7
+#serial 12
 
 AU_ALIAS([AC_CHECK_CLASS], [AX_CHECK_CLASS])
 AC_DEFUN([AX_CHECK_CLASS],[
 AC_REQUIRE([AX_PROG_JAVA])
 ac_var_name=`echo $1 | sed 's/\./_/g'`
-dnl Normaly I'd use a AC_CACHE_CHECK here but since the variable name is
+dnl Normally I'd use a AC_CACHE_CHECK here but since the variable name is
 dnl dynamic I need an extra level of extraction
 AC_MSG_CHECKING([for $1 class])
 AC_CACHE_VAL(ax_cv_class_$ac_var_name, [
-if test x$ac_cv_prog_uudecode_base64 = xyes; then
-dnl /**
-dnl  * Test.java: used to test dynamicaly if a class exists.
-dnl  */
-dnl public class Test
-dnl {
-dnl
-dnl public static void
-dnl main( String[] argv )
-dnl {
-dnl     Class lib;
-dnl     if (argv.length < 1)
-dnl      {
-dnl             System.err.println ("Missing argument");
-dnl             System.exit (77);
-dnl      }
-dnl     try
-dnl      {
-dnl             lib = Class.forName (argv[0]);
-dnl      }
-dnl     catch (ClassNotFoundException e)
-dnl      {
-dnl             System.exit (1);
-dnl      }
-dnl     lib = null;
-dnl     System.exit (0);
-dnl }
-dnl
-dnl }
-cat << \EOF > Test.uue
-begin-base64 644 Test.class
-yv66vgADAC0AKQcAAgEABFRlc3QHAAQBABBqYXZhL2xhbmcvT2JqZWN0AQAE
-bWFpbgEAFihbTGphdmEvbGFuZy9TdHJpbmc7KVYBAARDb2RlAQAPTGluZU51
-bWJlclRhYmxlDAAKAAsBAANlcnIBABVMamF2YS9pby9QcmludFN0cmVhbTsJ
-AA0ACQcADgEAEGphdmEvbGFuZy9TeXN0ZW0IABABABBNaXNzaW5nIGFyZ3Vt
-ZW50DAASABMBAAdwcmludGxuAQAVKExqYXZhL2xhbmcvU3RyaW5nOylWCgAV
-ABEHABYBABNqYXZhL2lvL1ByaW50U3RyZWFtDAAYABkBAARleGl0AQAEKEkp
-VgoADQAXDAAcAB0BAAdmb3JOYW1lAQAlKExqYXZhL2xhbmcvU3RyaW5nOylM
-amF2YS9sYW5nL0NsYXNzOwoAHwAbBwAgAQAPamF2YS9sYW5nL0NsYXNzBwAi
-AQAgamF2YS9sYW5nL0NsYXNzTm90Rm91bmRFeGNlcHRpb24BAAY8aW5pdD4B
-AAMoKVYMACMAJAoAAwAlAQAKU291cmNlRmlsZQEACVRlc3QuamF2YQAhAAEA
-AwAAAAAAAgAJAAUABgABAAcAAABtAAMAAwAAACkqvgSiABCyAAwSD7YAFBBN
-uAAaKgMyuAAeTKcACE0EuAAaAUwDuAAasQABABMAGgAdACEAAQAIAAAAKgAK
-AAAACgAAAAsABgANAA4ADgATABAAEwASAB4AFgAiABgAJAAZACgAGgABACMA
-JAABAAcAAAAhAAEAAQAAAAUqtwAmsQAAAAEACAAAAAoAAgAAAAQABAAEAAEA
-JwAAAAIAKA==
-====
-EOF
-                if $UUDECODE Test.uue; then
-                        :
-                else
-                        echo "configure: __oline__: uudecode had trouble decoding base 64 file 'Test.uue'" >&AS_MESSAGE_LOG_FD
-                        echo "configure: failed file was:" >&AS_MESSAGE_LOG_FD
-                        cat Test.uue >&AS_MESSAGE_LOG_FD
-                        ac_cv_prog_uudecode_base64=no
-                fi
-        rm -f Test.uue
-        if AC_TRY_COMMAND($JAVA -classpath ".:$CLASSPATH" $JAVAFLAGS Test $1) >/dev/null 2>&1; then
-                eval "ac_cv_class_$ac_var_name=yes"
-        else
-                eval "ac_cv_class_$ac_var_name=no"
-        fi
-        rm -f Test.class
-else
         AX_TRY_COMPILE_JAVA([$1], , [eval "ac_cv_class_$ac_var_name=yes"],
                 [eval "ac_cv_class_$ac_var_name=no"])
-fi
 eval "ac_var_val=$`eval echo ac_cv_class_$ac_var_name`"
 eval "HAVE_$ac_var_name=$`echo ac_cv_class_$ac_var_val`"
 HAVE_LAST_CLASS=$ac_var_val
@@ -137,7 +72,7 @@ else
         ifelse([$3], , :, [$3])
 fi
 ])
-dnl for some reason the above statment didn't fall though here?
+dnl for some reason the above statement didn't fall though here?
 dnl do scripts have variable scoping?
 eval "ac_var_val=$`eval echo ac_cv_class_$ac_var_name`"
 AC_MSG_RESULT($ac_var_val)
diff --git a/m4/ax_check_classpath.m4 b/m4/ax_check_classpath.m4
index 3c9081a0..e08a253d 100644
--- a/m4/ax_check_classpath.m4
+++ b/m4/ax_check_classpath.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_check_classpath.html
+#    https://www.gnu.org/software/autoconf-archive/ax_check_classpath.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -33,7 +33,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -48,7 +48,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 5
+#serial 6
 
 AU_ALIAS([AC_CHECK_CLASSPATH], [AX_CHECK_CLASSPATH])
 AC_DEFUN([AX_CHECK_CLASSPATH],[
diff --git a/m4/ax_check_rqrd_class.m4 b/m4/ax_check_rqrd_class.m4
index 8f14241b..baa041ac 100644
--- a/m4/ax_check_rqrd_class.m4
+++ b/m4/ax_check_rqrd_class.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_check_rqrd_class.html
+#   https://www.gnu.org/software/autoconf-archive/ax_check_rqrd_class.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -35,7 +35,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -50,7 +50,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 5
+#serial 6
 
 AU_ALIAS([AC_CHECK_RQRD_CLASS], [AX_CHECK_RQRD_CLASS])
 AC_DEFUN([AX_CHECK_RQRD_CLASS],[
diff --git a/m4/ax_java_options.m4 b/m4/ax_java_options.m4
index 36c10d92..722d7880 100644
--- a/m4/ax_java_options.m4
+++ b/m4/ax_java_options.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_java_options.html
+#     https://www.gnu.org/software/autoconf-archive/ax_java_options.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -27,7 +27,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 6
+#serial 7
 
 AU_ALIAS([AC_JAVA_OPTIONS], [AX_JAVA_OPTIONS])
 AC_DEFUN([AX_JAVA_OPTIONS],[
diff --git a/m4/ax_jni_include_dir.m4 b/m4/ax_jni_include_dir.m4
index b664d80b..ae7a5f04 100644
--- a/m4/ax_jni_include_dir.m4
+++ b/m4/ax_jni_include_dir.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_jni_include_dir.html
+#    https://www.gnu.org/software/autoconf-archive/ax_jni_include_dir.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -32,6 +32,10 @@
 #
 #   - at the configure level, setenv JAVAC
 #
+#   This macro depends on AC_CANONICAL_HOST which requires that config.guess
+#   and config.sub be distributed along with the source code.  See autoconf
+#   manual for details.
+#
 #   Note: This macro can work with the autoconf M4 macros for Java programs.
 #   This particular macro is not part of the original set of macros.
 #
@@ -44,11 +48,13 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 10
+#serial 15
 
 AU_ALIAS([AC_JNI_INCLUDE_DIR], [AX_JNI_INCLUDE_DIR])
 AC_DEFUN([AX_JNI_INCLUDE_DIR],[
 
+AC_REQUIRE([AC_CANONICAL_HOST])
+
 JNI_INCLUDE_DIRS=""
 
 if test "x$JAVA_HOME" != x; then
@@ -66,9 +72,17 @@ else
 fi
 
 case "$host_os" in
-        darwin*)        _JTOPDIR=`echo "$_JTOPDIR" | sed -e 's:/[[^/]]*$::'`
-                        _JINC="$_JTOPDIR/Headers";;
-        *)              _JINC="$_JTOPDIR/include";;
+        darwin*)        # Apple Java headers are inside the Xcode bundle.
+            macos_version=$(sw_vers -productVersion | sed -n -e 's/^@<:@0-9@:>@*.\(@<:@0-9@:>@*\).@<:@0-9@:>@*/\1/p')
+            if @<:@ "$macos_version" -gt "7" @:>@; then
+                _JTOPDIR="$(xcrun --show-sdk-path)/System/Library/Frameworks/JavaVM.framework"
+                _JINC="$_JTOPDIR/Headers"
+            else
+                _JTOPDIR="/System/Library/Frameworks/JavaVM.framework"
+                _JINC="$_JTOPDIR/Headers"
+            fi
+            ;;
+        *) _JINC="$_JTOPDIR/include";;
 esac
 _AS_ECHO_LOG([_JTOPDIR=$_JTOPDIR])
 _AS_ECHO_LOG([_JINC=$_JINC])
@@ -76,18 +90,27 @@ _AS_ECHO_LOG([_JINC=$_JINC])
 # On Mac OS X 10.6.4, jni.h is a symlink:
 # /System/Library/Frameworks/JavaVM.framework/Versions/Current/Headers/jni.h
 # -> ../../CurrentJDK/Headers/jni.h.
-AC_CHECK_FILE([$_JINC/jni.h],
-	[JNI_INCLUDE_DIRS="$JNI_INCLUDE_DIRS $_JINC"],
-	[_JTOPDIR=`echo "$_JTOPDIR" | sed -e 's:/[[^/]]*$::'`
-	 AC_CHECK_FILE([$_JTOPDIR/include/jni.h],
-		[JNI_INCLUDE_DIRS="$JNI_INCLUDE_DIRS $_JTOPDIR/include"],
-                AC_MSG_ERROR([cannot find JDK header files]))
-	])
+AC_CACHE_CHECK(jni headers, ac_cv_jni_header_path,
+[
+  if test -f "$_JINC/jni.h"; then
+    ac_cv_jni_header_path="$_JINC"
+    JNI_INCLUDE_DIRS="$JNI_INCLUDE_DIRS $ac_cv_jni_header_path"
+  else
+    _JTOPDIR=`echo "$_JTOPDIR" | sed -e 's:/[[^/]]*$::'`
+    if test -f "$_JTOPDIR/include/jni.h"; then
+      ac_cv_jni_header_path="$_JTOPDIR/include"
+      JNI_INCLUDE_DIRS="$JNI_INCLUDE_DIRS $ac_cv_jni_header_path"
+    else
+      ac_cv_jni_header_path=none
+    fi
+  fi
+])
 
 # get the likely subdirectories for system specific java includes
 case "$host_os" in
 bsdi*)          _JNI_INC_SUBDIRS="bsdos";;
 freebsd*)       _JNI_INC_SUBDIRS="freebsd";;
+darwin*)        _JNI_INC_SUBDIRS="darwin";;
 linux*)         _JNI_INC_SUBDIRS="linux genunix";;
 osf*)           _JNI_INC_SUBDIRS="alpha";;
 solaris*)       _JNI_INC_SUBDIRS="solaris";;
@@ -96,13 +119,15 @@ cygwin*)	_JNI_INC_SUBDIRS="win32";;
 *)              _JNI_INC_SUBDIRS="genunix";;
 esac
 
-# add any subdirectories that are present
-for JINCSUBDIR in $_JNI_INC_SUBDIRS
-do
+if test "x$ac_cv_jni_header_path" != "xnone"; then
+  # add any subdirectories that are present
+  for JINCSUBDIR in $_JNI_INC_SUBDIRS
+  do
     if test -d "$_JTOPDIR/include/$JINCSUBDIR"; then
          JNI_INCLUDE_DIRS="$JNI_INCLUDE_DIRS $_JTOPDIR/include/$JINCSUBDIR"
     fi
-done
+  done
+fi
 ])
 
 # _ACJNI_FOLLOW_SYMLINKS <path>
diff --git a/m4/ax_prog_jar.m4 b/m4/ax_prog_jar.m4
index 3c60fcaf..d474912a 100644
--- a/m4/ax_prog_jar.m4
+++ b/m4/ax_prog_jar.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#        http://www.gnu.org/software/autoconf-archive/ax_prog_jar.html
+#       https://www.gnu.org/software/autoconf-archive/ax_prog_jar.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -37,7 +37,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 7
+#serial 8
 
 AU_ALIAS([AC_PROG_JAR], [AX_PROG_JAR])
 AC_DEFUN([AX_PROG_JAR],[
diff --git a/m4/ax_prog_java.m4 b/m4/ax_prog_java.m4
index 03961db5..c2e6964e 100644
--- a/m4/ax_prog_java.m4
+++ b/m4/ax_prog_java.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#       http://www.gnu.org/software/autoconf-archive/ax_prog_java.html
+#       https://www.gnu.org/software/autoconf-archive/ax_prog_java.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -85,7 +85,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -100,7 +100,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 9
+#serial 10
 
 AU_ALIAS([AC_PROG_JAVA], [AX_PROG_JAVA])
 AC_DEFUN([AX_PROG_JAVA],[
diff --git a/m4/ax_prog_java_works.m4 b/m4/ax_prog_java_works.m4
index 54e132af..bc705261 100644
--- a/m4/ax_prog_java_works.m4
+++ b/m4/ax_prog_java_works.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_prog_java_works.html
+#    https://www.gnu.org/software/autoconf-archive/ax_prog_java_works.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -32,7 +32,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -47,57 +47,16 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 9
+#serial 11
 
 AU_ALIAS([AC_PROG_JAVA_WORKS], [AX_PROG_JAVA_WORKS])
 AC_DEFUN([AX_PROG_JAVA_WORKS], [
-AC_PATH_PROG(UUDECODE, uudecode, [no])
-if test x$UUDECODE != xno; then
-AC_CACHE_CHECK([if uudecode can decode base 64 file], ac_cv_prog_uudecode_base64, [
-dnl /**
-dnl  * Test.java: used to test if java compiler works.
-dnl  */
-dnl public class Test
-dnl {
-dnl
-dnl public static void
-dnl main( String[] argv )
-dnl {
-dnl     System.exit (0);
-dnl }
-dnl
-dnl }
-cat << \EOF > Test.uue
-begin-base64 644 Test.class
-yv66vgADAC0AFQcAAgEABFRlc3QHAAQBABBqYXZhL2xhbmcvT2JqZWN0AQAE
-bWFpbgEAFihbTGphdmEvbGFuZy9TdHJpbmc7KVYBAARDb2RlAQAPTGluZU51
-bWJlclRhYmxlDAAKAAsBAARleGl0AQAEKEkpVgoADQAJBwAOAQAQamF2YS9s
-YW5nL1N5c3RlbQEABjxpbml0PgEAAygpVgwADwAQCgADABEBAApTb3VyY2VG
-aWxlAQAJVGVzdC5qYXZhACEAAQADAAAAAAACAAkABQAGAAEABwAAACEAAQAB
-AAAABQO4AAyxAAAAAQAIAAAACgACAAAACgAEAAsAAQAPABAAAQAHAAAAIQAB
-AAEAAAAFKrcAErEAAAABAAgAAAAKAAIAAAAEAAQABAABABMAAAACABQ=
-====
-EOF
-if $UUDECODE Test.uue; then
-        ac_cv_prog_uudecode_base64=yes
-else
-        echo "configure: __oline__: uudecode had trouble decoding base 64 file 'Test.uue'" >&AS_MESSAGE_LOG_FD
-        echo "configure: failed file was:" >&AS_MESSAGE_LOG_FD
-        cat Test.uue >&AS_MESSAGE_LOG_FD
-        ac_cv_prog_uudecode_base64=no
-fi
-rm -f Test.uue])
-fi
-if test x$ac_cv_prog_uudecode_base64 != xyes; then
-        rm -f Test.class
-        AC_MSG_WARN([I have to compile Test.class from scratch])
         if test x$ac_cv_prog_javac_works = xno; then
                 AC_MSG_ERROR([Cannot compile java source. $JAVAC does not work properly])
         fi
         if test x$ac_cv_prog_javac_works = x; then
                 AX_PROG_JAVAC
         fi
-fi
 AC_CACHE_CHECK(if $JAVA works, ac_cv_prog_java_works, [
 JAVA_TEST=Test.java
 CLASS_TEST=Test.class
@@ -111,7 +70,6 @@ public static void main (String args[]) {
 } }
 EOF
 changequote([, ])dnl
-if test x$ac_cv_prog_uudecode_base64 != xyes; then
         if AC_TRY_COMMAND($JAVAC $JAVACFLAGS $JAVA_TEST) && test -s $CLASS_TEST; then
                 :
         else
@@ -119,7 +77,6 @@ if test x$ac_cv_prog_uudecode_base64 != xyes; then
           cat $JAVA_TEST >&AS_MESSAGE_LOG_FD
           AC_MSG_ERROR(The Java compiler $JAVAC failed (see config.log, check the CLASSPATH?))
         fi
-fi
 if AC_TRY_COMMAND($JAVA -classpath . $JAVAFLAGS $TEST) >/dev/null 2>&1; then
   ac_cv_prog_java_works=yes
 else
@@ -127,7 +84,7 @@ else
   cat $JAVA_TEST >&AS_MESSAGE_LOG_FD
   AC_MSG_ERROR(The Java VM $JAVA failed (see config.log, check the CLASSPATH?))
 fi
-rm -fr $JAVA_TEST $CLASS_TEST Test.uue
+rm -f $JAVA_TEST $CLASS_TEST
 ])
 AC_PROVIDE([$0])dnl
 ]
diff --git a/m4/ax_prog_javac.m4 b/m4/ax_prog_javac.m4
index d061243c..8abb733f 100644
--- a/m4/ax_prog_javac.m4
+++ b/m4/ax_prog_javac.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#       http://www.gnu.org/software/autoconf-archive/ax_prog_javac.html
+#      https://www.gnu.org/software/autoconf-archive/ax_prog_javac.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -49,7 +49,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -64,7 +64,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 7
+#serial 8
 
 AU_ALIAS([AC_PROG_JAVAC], [AX_PROG_JAVAC])
 AC_DEFUN([AX_PROG_JAVAC],[
diff --git a/m4/ax_prog_javac_works.m4 b/m4/ax_prog_javac_works.m4
index 7dfa1e37..9b48149d 100644
--- a/m4/ax_prog_javac_works.m4
+++ b/m4/ax_prog_javac_works.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_prog_javac_works.html
+#   https://www.gnu.org/software/autoconf-archive/ax_prog_javac_works.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -32,7 +32,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -47,7 +47,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 6
+#serial 7
 
 AU_ALIAS([AC_PROG_JAVAC_WORKS], [AX_PROG_JAVAC_WORKS])
 AC_DEFUN([AX_PROG_JAVAC_WORKS],[
diff --git a/m4/ax_prog_javah.m4 b/m4/ax_prog_javah.m4
index 2809f29c..935ec896 100644
--- a/m4/ax_prog_javah.m4
+++ b/m4/ax_prog_javah.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#       http://www.gnu.org/software/autoconf-archive/ax_prog_javah.html
+#      https://www.gnu.org/software/autoconf-archive/ax_prog_javah.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -21,7 +21,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 7
+#serial 11
 
 AU_ALIAS([AC_PROG_JAVAH], [AX_PROG_JAVAH])
 AC_DEFUN([AX_PROG_JAVAH],[
@@ -30,18 +30,35 @@ AC_REQUIRE([AC_PROG_CPP])dnl
 AC_PATH_PROG(JAVAH,javah)
 AS_IF([test -n "$ac_cv_path_JAVAH"],
       [
-        AC_TRY_CPP([#include <jni.h>],,[
+        AC_PREPROC_IFELSE([AC_LANG_SOURCE([[#include <jni.h>]])],[],[
         ac_save_CPPFLAGS="$CPPFLAGS"
-        ax_prog_javah_bin_dir=`AS_DIRNAME([$ac_cv_path_JAVAH])`
-        ac_dir="`AS_DIRNAME([$ax_prog_javah_bin])`/include"
+        _ACJAVAH_FOLLOW_SYMLINKS("$ac_cv_path_JAVAH")
+        ax_prog_javah_bin_dir=`AS_DIRNAME([$_ACJAVAH_FOLLOWED])`
+        ac_dir="`AS_DIRNAME([$ax_prog_javah_bin_dir])`/include"
         AS_CASE([$build_os],
-                [cygwin*],
+                [cygwin*|mingw*],
                 [ac_machdep=win32],
                 [ac_machdep=`AS_ECHO($build_os) | sed 's,[[-0-9]].*,,'`])
         CPPFLAGS="$ac_save_CPPFLAGS -I$ac_dir -I$ac_dir/$ac_machdep"
-        AC_TRY_CPP([#include <jni.h>],
-                   ac_save_CPPFLAGS="$CPPFLAGS",
-                   AC_MSG_WARN([unable to include <jni.h>]))
+        AC_PREPROC_IFELSE([AC_LANG_SOURCE([[#include <jni.h>]])],
+                          [ac_save_CPPFLAGS="$CPPFLAGS"],
+                          [AC_MSG_WARN([unable to include <jni.h>])])
         CPPFLAGS="$ac_save_CPPFLAGS"])
       ])
 ])
+
+AC_DEFUN([_ACJAVAH_FOLLOW_SYMLINKS],[
+# find the include directory relative to the javac executable
+_cur="$1"
+while ls -ld "$_cur" 2>/dev/null | grep " -> " >/dev/null; do
+        AC_MSG_CHECKING([symlink for $_cur])
+        _slink=`ls -ld "$_cur" | sed 's/.* -> //'`
+        case "$_slink" in
+        /*) _cur="$_slink";;
+        # 'X' avoids triggering unwanted echo options.
+        *) _cur=`echo "X$_cur" | sed -e 's/^X//' -e 's:[[^/]]*$::'`"$_slink";;
+        esac
+        AC_MSG_RESULT([$_cur])
+done
+_ACJAVAH_FOLLOWED="$_cur"
+])
diff --git a/m4/ax_sys_weak_alias.m4 b/m4/ax_sys_weak_alias.m4
index e1bfd336..733b1ddd 100644
--- a/m4/ax_sys_weak_alias.m4
+++ b/m4/ax_sys_weak_alias.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#     http://www.gnu.org/software/autoconf-archive/ax_sys_weak_alias.html
+#    https://www.gnu.org/software/autoconf-archive/ax_sys_weak_alias.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -22,8 +22,8 @@
 #   another object file.
 #
 #   There are four known schemes of declaring weak symbols; each scheme is
-#   checked in turn, and the first one found is prefered. Note that only one
-#   of the mentioned preprocessor macros will be defined!
+#   checked in turn, and the first one found is preferred. Note that only
+#   one of the mentioned preprocessor macros will be defined!
 #
 #   1. Function attributes
 #
@@ -110,7 +110,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 6
+#serial 8
 
 AU_ALIAS([KLM_SYS_WEAK_ALIAS], [AX_SYS_WEAK_ALIAS])
 AC_DEFUN([AX_SYS_WEAK_ALIAS], [
diff --git a/m4/ax_try_compile_java.m4 b/m4/ax_try_compile_java.m4
index a8ed6b2a..245c36c4 100644
--- a/m4/ax_try_compile_java.m4
+++ b/m4/ax_try_compile_java.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_try_compile_java.html
+#   https://www.gnu.org/software/autoconf-archive/ax_try_compile_java.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -29,7 +29,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 8
+#serial 10
 
 AU_ALIAS([AC_TRY_COMPILE_JAVA], [AX_TRY_COMPILE_JAVA])
 AC_DEFUN([AX_TRY_COMPILE_JAVA],[
@@ -48,8 +48,8 @@ dnl Don't remove the temporary files here, so they can be examined.
 else
   echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
   cat Test.java >&AS_MESSAGE_LOG_FD
-ifelse([$4], , , [  rm -fr Test.java Test.class
+ifelse([$4], , , [  rm -f Test.java Test.class
   $4
 ])dnl
 fi
-rm -fr Test.java Test.class])
+rm -f Test.java Test.class])
diff --git a/m4/ax_try_run_java.m4 b/m4/ax_try_run_java.m4
index c680f03f..2ebb86d6 100644
--- a/m4/ax_try_run_java.m4
+++ b/m4/ax_try_run_java.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_try_run_java.html
+#     https://www.gnu.org/software/autoconf-archive/ax_try_run_java.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -29,7 +29,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 2
+#serial 3
 
 AU_ALIAS([AC_TRY_RUN_JAVA], [AX_TRY_RUN_JAVA])
 AC_DEFUN([AX_TRY_RUN_JAVA],[