[libxml2] Fix autotools warnings

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 0ff527482d0b29b06bae8a5438a2c32ca69a11a8
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Aug 17 02:54:28 2020 +0200

    Fix autotools warnings

 configure.ac     | 23 ++++++++++++++---------
 fuzz/Makefile.am |  9 +++++++++
 2 files changed, 23 insertions(+), 9 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 32c47ac8f..a4c675bbd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,15 +1,20 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ([2.63])
-AC_INIT
+
+m4_define([MAJOR_VERSION], 2)
+m4_define([MINOR_VERSION], 9)
+m4_define([MICRO_VERSION], 10)
+
+AC_INIT([libxml2],[MAJOR_VERSION.MINOR_VERSION.MICRO_VERSION])
 AC_CONFIG_SRCDIR([entities.c])
 AC_CONFIG_HEADERS([config.h])
 AM_MAINTAINER_MODE([enable])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CANONICAL_HOST
 
-LIBXML_MAJOR_VERSION=2
-LIBXML_MINOR_VERSION=9
-LIBXML_MICRO_VERSION=10
+LIBXML_MAJOR_VERSION=MAJOR_VERSION
+LIBXML_MINOR_VERSION=MINOR_VERSION
+LIBXML_MICRO_VERSION=MICRO_VERSION
 LIBXML_MICRO_VERSION_SUFFIX=
 LIBXML_VERSION=$LIBXML_MAJOR_VERSION.$LIBXML_MINOR_VERSION.$LIBXML_MICRO_VERSION$LIBXML_MICRO_VERSION_SUFFIX
 LIBXML_VERSION_INFO=`expr $LIBXML_MAJOR_VERSION + 
$LIBXML_MINOR_VERSION`:$LIBXML_MICRO_VERSION:$LIBXML_MINOR_VERSION
@@ -50,7 +55,7 @@ AC_SUBST(LIBXML_VERSION_EXTRA)
 
 VERSION=${LIBXML_VERSION}
 
-AM_INIT_AUTOMAKE(libxml2, $VERSION)
+AM_INIT_AUTOMAKE([foreign])
 
 # Support silent build rules, requires at least automake-1.11. Disable
 # by either passing --disable-silent-rules to configure or passing V=1
@@ -1514,8 +1519,8 @@ else
 
             AC_CHECK_HEADER(unicode/ucnv.h,
             AC_MSG_CHECKING(for icu)
-            AC_TRY_LINK([#include <unicode/ucnv.h>],[
-        UConverter *utf = ucnv_open("UTF-8", NULL);],[
+            AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <unicode/ucnv.h>]], [[
+        UConverter *utf = ucnv_open("UTF-8", NULL);]])],[
                 AC_MSG_RESULT(yes)
                 have_libicu=yes],[
                 AC_MSG_RESULT(no)
@@ -1526,8 +1531,8 @@ else
                 LDFLAGS="${LDFLAGS} ${ICU_LIBS}"
                 LIBS="${LIBS} -licucore"
 
-                AC_TRY_LINK([#include <unicode/ucnv.h>],[
-        UConverter *utf = ucnv_open("UTF-8", NULL);],[
+                AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <unicode/ucnv.h>]], [[
+        UConverter *utf = ucnv_open("UTF-8", NULL);]])],[
                     AC_MSG_RESULT(yes)
                     have_libicu=yes
                     ICU_LIBS="${ICU_LIBS} -licucore"
diff --git a/fuzz/Makefile.am b/fuzz/Makefile.am
index 30883de5f..feba65be3 100644
--- a/fuzz/Makefile.am
+++ b/fuzz/Makefile.am
@@ -1,3 +1,4 @@
+AUTOMAKE_OPTIONS = -Wno-syntax
 EXTRA_PROGRAMS = html htmlSeed regexp uri schema schemaSeed xml xmlSeed \
                  xpath xpathSeed
 check_PROGRAMS = testFuzzer
@@ -20,10 +21,18 @@ XML_SEED_CORPUS_SRC = \
 
 testFuzzer_SOURCES = testFuzzer.c fuzz.c
 
+.PHONY: tests clean-corpus
+
 tests: testFuzzer$(EXEEXT)
        @echo "## Running fuzzer tests"
        @./testFuzzer$(EXEEXT)
 
+clean-corpus:
+       rm -rf seed/html.stamp seed/html
+       rm -rf seed/schema.stamp seed/schema
+       rm -rf seed/xml.stamp seed/xml
+       rm -rf seed/xpath.stamp seed/xpath
+
 # XML fuzzer
 
 xmlSeed_SOURCES = xmlSeed.c fuzz.c