/hg/release/icedtea6-1.7: Update INSTALL documentation and confi...
andrew at icedtea.classpath.org
andrew at icedtea.classpath.org
Thu Jul 22 01:25:00 PDT 2010
changeset 36fc1b3ae030 in /hg/release/icedtea6-1.7
details: http://icedtea.classpath.org/hg/release/icedtea6-1.7?cmd=changeset;node=36fc1b3ae030
author: Andrew John Hughes <ahughes at redhat.com>
date: Thu Jul 22 09:24:52 2010 +0100
Update INSTALL documentation and configure help.
2010-07-21 Andrew John Hughes <ahughes at redhat.com>
* INSTALL: Updated, with documentation of new
options and removal of outdated information.
* acinclude.m4: (WITH_OPENJDK_SRC_DIR): Add '=DIR' to the
configure help. (AC_CHECK_FOR_OPENJDK): Add '[=DIR]' to the
configure help. (AC_CHECK_WITH_TZDATA_DIR): Remove broken
expansion of ${DEFAULT} in configure help, replacing it with
the value used. (IT_CHECK_NEW_PLUGIN): Remove
'experimental'. Fix default in configure help.
* configure.ac: Fix default in configure help for NIO2.
diffstat:
4 files changed, 310 insertions(+), 93 deletions(-)
ChangeLog | 14 ++
INSTALL | 373 ++++++++++++++++++++++++++++++++++++++++++++--------------
acinclude.m4 | 12 -
configure.ac | 4
diffs (500 lines):
diff -r 32f3cb4b987b -r 36fc1b3ae030 ChangeLog
--- a/ChangeLog Wed Jul 21 16:46:23 2010 -0400
+++ b/ChangeLog Thu Jul 22 09:24:52 2010 +0100
@@ -1,3 +1,17 @@ 2010-07-21 Deepak Bhole <dbhole at redhat.
+2010-07-21 Andrew John Hughes <ahughes at redhat.com>
+
+ * INSTALL: Updated, with documentation
+ of new options and removal of outdated information.
+ * acinclude.m4:
+ (WITH_OPENJDK_SRC_DIR): Add '=DIR' to the configure help.
+ (AC_CHECK_FOR_OPENJDK): Add '[=DIR]' to the configure help.
+ (AC_CHECK_WITH_TZDATA_DIR): Remove broken expansion of ${DEFAULT}
+ in configure help, replacing it with the value used.
+ (IT_CHECK_NEW_PLUGIN): Remove 'experimental'. Fix default in
+ configure help.
+ * configure.ac:
+ Fix default in configure help for NIO2.
+
2010-07-21 Deepak Bhole <dbhole at redhat.com>
* rt/net/sourceforge/jnlp/JNLPFile.java: Use location as sourceLocation if
diff -r 32f3cb4b987b -r 36fc1b3ae030 INSTALL
--- a/INSTALL Wed Jul 21 16:46:23 2010 -0400
+++ b/INSTALL Thu Jul 22 09:24:52 2010 +0100
@@ -7,8 +7,10 @@ a default location.
The build requirements are as follows:
-GNU libgcj 4.3.0 (or equivalent 1.5 class library, such as GNU Classpath >= 0.95)
-Eclipse Java Compiler
+A bootstrap JDK, either:
+ - GNU libgcj 4.3.0 (or equivalent class library based on GNU Classpath >= 0.95) for --with-gcj-home mode (the default)
+ - IcedTea6 for --with-openjdk mode
+Eclipse Java Compiler (ecj)
CUPS
libX11 (libXp, libXtst, libXi, libXt)
Freetype2
@@ -29,112 +31,273 @@ libpng-devel
libpng-devel
libjpeg-devel >= 6b
zlib-devel
+xulrunner-devel (can be disabled using --disable-plugin)
rhino (can be disabled using --without-rhino)
-
-For building the PulseAudio based mixer, you will need
-pulseaudio-libs-devel >= 0.9.11
-
-For building VisualVM, you will need
-netbeans = 6.5
-
-For building the zero-assembler port (see below), you will need libffi.
-
-For building the Shark JIT, you will need LLVM 2.5 or current SVN.
-
-For building with systemtap support (--enable-systemtap), you will need
-systemtap-sdt-devel (available since systemtap 0.9.5). This also needs
-the --with-abs-install-dir configure option to make sure the hotspot.stp.in
-tapset gets the correct installation location for the libjvm.so, it
-defaults to the root of the j2sdk-image build dir otherwise (but then
-you cannot move that to another location without adjusting the paths
-in the tapset/hotspot.stp file. For example:
- --enable-systemtap --with-abs-install-dir=/usr/lib/jvm/java-1.6.0-openjdk
-(Java method tracing works starting with systemtap 0.9.9)
+libffi (for --enable-zero or on archs other than x86/x86_64/sparc)
+pulseaudio-libs-devel >= 0.9.11 (for --enable-pulse-java)
+LLVM 2.5 or later (for --enable-shark)
+systemtap-sdl-devel >= 0.9.5 (for --enable-systemtap, Java method tracing requires systemtap >= 0.9.9)
+netbeans = 6.5 (for --enable-visualvm)
See ./configure --help if you need to override the defaults.
-To bootstrap IcedTea with ecj and a Classpath-based JDK such as GCJ:
-autoreconf
+To bootstrap IcedTea with ecj and a GNU Classpath-based JDK:
+./autogen.sh
./configure
make
-To build IcedTea with an older version of IcedTea or OpenJDK, use:
-autoreconf
-./configure --with-openjdk
- to specify the location use --with-openjdk=/path/to/icedtea]
+The following locations are checked for a GNU Classpath-based JDK:
+ * /usr/lib/jvm/java-gcj
+ * /usr/lib/jvm/gcj-jdk
+ * /usr/lib/jvm/cacao
+in that order.
+
+To build IcedTea with an older version of IcedTea6, use:
+./autogen.sh
+./configure --with-openjdk
make
-There is currently no install target.
+The following locations are checked for an IcedTea6 JDK:
+ * /usr/lib/jvm/java-openjdk
+ * /usr/lib/jvm/icedtea6
+ * /usr/lib/jvm/java-6-openjdk
+ * /usr/lib/jvm/openjdk
+ * /usr/lib/jvm/java-icedtea
+in the order given above.
-IcedTea ends up in openjdk/build/<os>-<arch> when the build completes.
-Example instantiations of <os>-<arch> include linux-i586, linux-amd64 and linux-ppc64.
+Note that IcedTea7 can not be used to build IcedTea6.
-Rebuilding The IcedTea Plugs
-----------------------------
+There is currently no install target. IcedTea ends up in
+openjdk/build/<os>-<arch> when the build completes. Example
+instantiations of <os>-<arch> include linux-i586, linux-amd64 and
+linux-ppc64.
-When IcedTea is initially built, it creates stamp files in the stamps directory
-to determine what and when dependencies were compiled. For example, to rebuild
-the rt plugs certain files need to be deleted before restarting the build.
+Most targets in IcedTea creat stamp files in the stamps directory to
+determine what and when dependencies were compiled. Each target has a
+corresponding clean-x target which removes the output and the stamp
+file, allowing it to be rebuilt. For example, stamps/rt.stamp (alias
+rt) builds the bootstrap classes needed in the bootstrap build and
+clean-rt removes the classes and the stamp file.
- - If the rt plugs have been modified, delete stamps/rt-class-files.stamp.
- - If a new class has been added to the rt plugs, delete
- rt-source-files.txt so it can be recreated with the new class list.
+Build Modification Options
+==========================
-To view all targets that create stamp files, see
-Makefile.am (section 'All Stamped Targets').
+The build process may be modified by passing the following options
+to configure:
-The Zero Assembler Port
------------------------
+* --disable-docs: Don't build the Javadoc documentation.
+* --with-openjdk-src-dir: Copy the specified OpenJDK tree, rather than
+ downloading and extracting a tarball.
+* --disable-optimizations: Build with -O0.
+* --enable-hg: Checkout the OpenJDK tree from Mercurial, rather than
+ downloading and extracting a tarball.
+* --with-gcj: Compile ecj to native code with gcj prior to building.
+* --with-openjdk: Perform a quick (no bootstrap) build using an installed
+ copy of IcedTea6. If a directory is not specified, a check against
+ the list presented above is performed.
+* --with-parallel-jobs: Run the specified number of parallel jobs when
+ building HotSpot and the JDK.
+* --with-netbeans-home: The location of NetBeans for use in the VisualVM build,
+ defaults to /usr/share/netbeans.
+* --with-ant-home: The location of Ant, defaults to /usr/share/ant.
+* --with-pkgversion=PKG: Include the specified distro package information in
+ the output of java -version.
+* --with-gcj-home: Perform a full bootstrap build using an installed
+ copy of a GNU Classpath JDK such as gcj. If a directory is not specified,
+ a check against the list presented above is performed.
+* --with-java: Specify the location of a 'java' binary. By default, the path
+ is checked for gij and java.
+* --with-ecj: Specify the location of a 'ecj' binary. By default, the path
+ is checked for ecj, ecj-3.1, ecj-3.2 and ecj-3.3.
+* --with-javac: Specify the location of a 'javac' binary. By default, the path
+ is checked for javac.
+* --with-jar: Specify the location of a 'jar' binary. By default, the path
+ is checked for gjar and jar.
+* --with-javah: Specify the location of a 'javah' binary. By default, the path
+ is checked for gjavah and javah.
+* --with-rmic: Specify the location of a 'rmic' binary. By default, the path
+ is checked for grmic and rmic.
+* --with-ecj-jar: Specify the location of an ecj JAR file. By default, the
+ following paths are checked:
+ - /usr/share/java/eclipse-ecj.jar
+ - /usr/share/java/ecj.jar
+ - /usr/share/eclipse-ecj-3.{2,3,4,5}/lib/ecj.jar
+* --with-xalan2-jar: Specify the location of a xalan2 JAR file. By default, the
+ following paths are checked:
+ - /usr/share/java/xalan-j2.jar
+ - /usr/share/java/xalan2.jar
+ - /usr/share/xalan/lib/xalan.jar
+* --with-xalan2-serializer-jar: Specify the location of a xalan2 serializer JAR file.
+ By default, the following paths are checked:
+ - /usr/share/java/xalan-j2-serializer.jar
+ - /usr/share/xalan-serializer/lib/serializer.jar
+ - /usr/share/java/serializer.jar
+* --with-xerces2-jar: Specify the location of a xerces2 JAR file. By default, the
+ following paths are checked:
+ - /usr/share/java/xerces-j2.jar
+ - /usr/share/java/xerces2.jar
+ - /usr/share/xerces-2/lib/xercesImpl.jar
+ - /usr/share/java/xercesImpl.jar
+* --with-openjdk-src-zip: Specify the location of the OpenJDK tarball to avoid downloading.
+* --with-hotspot-src-zip: Specify the location of the HotSpot tarball to avoid downloading.
+* --with-alt-jar: Use the specified jar binary in the second stage rather than the one just built.
+* --with-cacao-home: Specify the location of an installed CACAO to use rather than downloading
+ and building one.
+* --with-cacao-src-zip: Specify the location of a CACAO tarball to avoid downloading.
+* --with-cacao-src-dir: Specify the location of a CACAO source tree to avoid downloading.
+* --with-hg-revision: Specify a hg revision to use (as opposed to tip) with the --enable-hg option.
+* --with-tzdata-dir: Specify the location of Java timezone data, defaulting to /usr/share/javazi.
+* --with-netbeans: Specify the location of NetBeans for VisualVM, defaulting to the netbeans on the path.
+* --with-abs-install-dir: The final install location of the j2sdk-image, for use in the SystemTap tapset.
-Gary Benson has developed a port of the interpreter included in the
-HotSpot virtual machine which avoids using any assembly language. As
-a pure C++ interpreter, it should be possible to build this on most
-architectures and have a working (albeit slow) version of OpenJDK.
-Successful builds have been made on ppc, ppc64 and arm. The zero
-assembler port is enabled by default on platforms other than x86,
-x86_64 and sparc. To enable it on these platforms, use the
---enable-zero option.
+Other options may be supplied which enable or disable new features.
+These are documented fully in the relevant section below.
-Gary is now working on a JIT called Shark to provide better
-performance on platforms which need to use the zero port. A
-preliminary version of this is now included with IcedTea and can be
-built with the --enable-shark option.
+* --enable-visualvm: Build VisualVM.
+* --enable-pulse-java: Build the PulseAudio sound provider.
+* --disable-xrender: Don't include the XRender pipeline.
+* --enable-nio2: Include the NIO2 backport.
+* --enable-systemtap: Include support for tracing using systemtap.
+* --enable-nss: Enable the NSS security provider.
+* --enable-cacao: Replace HotSpot with the CACAO VM.
+* --enable-shark: Build the Shark LLVM-based JIT.
+* --enable-zero: Build the zero assembler port on x86/x86_64/sparc platforms.
+* --disable-plugin: Don't build the browser plugin.
+* --disable-npplugin: Build the old unsupported plugin rather than NPPlugin.
+* --with-hotspot-build: The HotSpot to use, defaulting to 'original' i.e. hs14 as bundled with OpenJDK.
+* --with-rhino: Include Javascript support using Rhino.
+* --with-additional-vms=vm-list: Additional VMs to build using the system described
+ below.
+
+Testing
+=======
+
+IcedTea6 includes support for running the test suite included with
+OpenJDK, using the in-tree copy of JTReg. Invoking 'make check' will
+cause the HotSpot, JDK and langtools test suites to be run. The
+individual test suites may be run using the check-hotspot, check-jdk
+and check-langtools targets respectively.
+
+VisualVM
+========
+
+IcedTea6 supports the downloading and compilation of VisualVM 1.1.1
+via the --enable-visualvm option. This requires NetBeans 6.5. The
+build takes place following that of IcedTea, which is used to compile
+VisualVM, and the result is installed in the SDK image created by the
+OpenJDK build (i.e. openjdk/build/<os>-<arch>/j2sdk-image).
+
+The PulseAudio provider
+=======================
+
+IcedTea6 includes an implementation of the javax.sound.* APIs using
+PulseAudio which can be enabled using --enable-pulse-java. The resulting
+provider is org.classpath.icedtea.pulseaudio.PulseAudioMixerProvider.
+
+Xrender Support
+===============
+
+IcedTea6 includes support for an Xrender-based rendering pipeline
+developed by Clemens Eisserer (http://linuxhippy.blogspot.com/). This
+is compiled by default, and can be disabled using --disable-xrender.
+To actually use the pipeline, the sun.java2d.xrender property needs to
+be set to true, e.g. by passing the -Dsun.java2d.xrender=True option
+to java.
+
+NIO2 Backport
+=============
+
+IcedTea6 includes a backport of NIO2 from OpenJDK7; see
+http://openjdk.java.net/projects/nio/. This provides support for
+asynchronous I/O and an improved file system API, providing access to
+POSIX file permissions, timestamps, extended attributes and ACLs and
+allowing directories to be watched. This is enabled using the
+--enable-nio2 option.
+
+As new classes can not be added to the java.* and javax.* namespace of
+the 1.6 API, the new java.nio classes are contained in
+org.classpath.icedtea.java.nio, so code will needed to be adjusted to
+work with the backport.
+
+SystemTap
+=========
+
+IcedTea6 includes work to allow the existing DTrace probes included in
+OpenJDK to be used with SystemTap. This is enabled using the
+--enable-systemtap option, and requires version 0.9.5 or later (0.9.9
+or later if you want Java method tracing). The tapset needs to know
+the final install location of the JDK, so the --with-abs-install-dir
+should also be used to specify this. If not set, it defaults to the
+in-tree location of openjdk/build/<os>-<arch>/j2sdk-image and requires
+manual changes to tapset/hotspot.stp to work from elsewhere. For
+example, if you plan to install the resulting build in
+/usr/lib/jvm/java-1.6.0-openjdk, then you should specify
+--enable-systemtap
+--with-abs-install-dir=/usr/lib/jvm/java-1.6.0-openjdk.
+
+NSS Security Provider
+=====================
+
+OpenJDK includes an NSS-based security provider in the form of
+sun.security.pkcs11.SunPKCS11. However, as this needs to know the
+location of the NSS installation it should use, it is not enabled
+in normal OpenJDK builds. As IcedTea can detect NSS using configure,
+it can simplify the process of enabling this provider. If --enable-nss
+is specified, then a configuration file for the NSS provider will be
+generated and installed, and the provider turned on.
CACAO
------
+=====
-The CACAO virtual machine (http://cacaovm.org) can be used as an
-alternative to the HotSpot virtual machine. One advantage of this is
-that it already provides a JIT for many platforms to which HotSpot has
-not yet been ported, including ppc, ppc64, arm and mips. To use CACAO
-as the VM, use the --with-cacao option. This will download CACAO
-0.99.3 during the build. To use a different version, use
---with-cacao-home=<dir> to point to an existing installation which use
-the Sun VM interface.
+IcedTea6 can use CACAO as the virtual machine, as opposed to HotSpot.
+One advantage of this is that CACAO has a JIT implementation for
+more platforms than HotSpot, including ppc, ppc64, arm and mips.
+When --enable-cacao is specified, CACAO will be downloaded and built,
+followed by the JDK portion of OpenJDK resulting in a CACAO+OpenJDK
+image in openjdk/build/<os>-<arch>/j2sdk-image. The --with-cacao-home
+option can be used to specify the use of an existing CACAO install
+instead, and --with-cacao-src-zip/dir options exist to allow the use
+of a pre-downloaded zip or source tree respectively.
-Building additional virtual machines
-------------------------------------
+Zero & Shark
+============
-Although IcedTea can be built multiple times to use a different virtual
-machine, addtional VM's can be built without building the other components
-multiple times.
+IcedTea6 includes a zero assembler port of HotSpot, which avoids
+architecture-specific code as much as possible, allowing an
+interpreter to be built and run on most platforms (albeit very
+slowly). As HotSpot only includes JITs for x86, x86_64 and SPARC, the
+zero assembler port is automatically enabled on all other
+architectures. On x86, x86_64 and SPARC, it may be built using
+--enable-zero.
-On architectures where hotspot is available, use
- --with-additional-vms=cacao,zero (or shark instead of zero)
-on architectures where only zero (or shark) is available, use
- --with-additional-vms=cacao
-to build the additional VM's. It's not possible to build cacao as the
-default VM, and zero as additional VM.
-To build zero as the default VM and shark as an additional VM, use
- --enable-zero --with-additional-vms=shark
+To overcome the performance issues inherent in zero, a LLVM-based JIT
+called Shark has been developed. This performs Just-In-Time compilation
+on any architecture supported by LLVM. To enable it, pass the option
+--enable-shark to configure. Please note that Shark is still in
+development and builds are still likely to fail at present.
-The additional VM's are available by calling the java with the option
-`-cacao', `-zero' or `-shark', or by calling the java tools with
-`-J-<vm name>'. If the build was configured with '--enable-shark',
-use `-Xint' to just use the zero VM.
+The Browser Plugin
+==================
-Support for different versions of HotSpot
------------------------------------------
+IcedTea6 currently includes two browser plugins; a new supported
+plugin based on NPRuntime and an older deprecated plugin used in
+previous releases. By default, the first will be built and this
+is the recommended option. Passing the option --disable-npplugin
+reverts to the old plugin, while --disable-plugin turns off the
+build of a browser plugin altogether.
+
+A test suite is supplied for the browser plugin. It can be built
+using 'make plugin-tests' and run by loading the HTML page specified
+into a browser with the plugin installed.
+
+For debugging, the environment variable ICEDTEAPLUGIN_DEBUG should be
+set to 'true'. This will produce output on the console from the C++
+side, and output from the Java side in $HOME/.icedteaplugin/java.stdout
+and $HOME/.icedteaplugin/java.stderr. It also starts the debug server
+on port 8787.
+
+Support for Different Versions of HotSpot
+=========================================
IcedTea allows the version of HotSpot provided with the upstream build
drop to be replaced with another. Support for this is provided by the
@@ -169,7 +332,47 @@ are HotSpot 14 ('original') which is pro
are HotSpot 14 ('original') which is provided by the upstream OpenJDK
tarball, and 'hs16', which is used in hotspot.map to provide the
latest version of HotSpot 16. Thus, either --with-hotspot-build
-without an argument or --with-hotspot-build=hs16 provides the
-latest supported hs16, while no HotSpot build argument,
+without an argument or --with-hotspot-build=hs16 provides the latest
+supported hs16, while no HotSpot build argument,
--without-hotspot-build or --with-hotspot-build=original uses the
upstream HotSpot.
+
+Javascript Support
+==================
+
+IcedTea6 adds Javascript support via the javax.script API by using
+an existing installation of Rhino. Support is enabled by default,
+with the following locations being searched for a Rhino JAR file:
+
+* /usr/share/java/rhino.jar
+* /usr/share/java/js.jar
+* /usr/share/rhino-1.6/lib/js.jar
+
+A JAR file can instead be specified using the --with-rhino option,
+or support may be disabled by specifying --without-rhino.
+
+Note that the final installed JAR file is a modified version with the
+namespace prefixed by 'sun.' as in the proprietary Oracle JDK. This
+avoids conflicts between the JDK's copy of Rhino and any used by other
+applications.
+
+Building Additional Virtual Machines
+====================================
+
+Although IcedTea can be built multiple times to use a different virtual
+machine, additional VMs can be built without building the other components
+multiple times.
+
+On architectures where hotspot is available, use
+ --with-additional-vms=cacao,zero (or shark instead of zero)
+on architectures where only zero (or shark) is available, use
+ --with-additional-vms=cacao
+to build the additional VM's. It's not possible to build cacao as the
+default VM, and zero as additional VM.
+To build zero as the default VM and shark as an additional VM, use
+ --enable-zero --with-additional-vms=shark
+
+The additional VM's are available by calling the java with the option
+`-cacao', `-zero' or `-shark', or by calling the java tools with
+`-J-<vm name>'. If the build was configured with '--enable-shark',
+use `-Xint' to just use the zero VM.
diff -r 32f3cb4b987b -r 36fc1b3ae030 acinclude.m4
--- a/acinclude.m4 Wed Jul 21 16:46:23 2010 -0400
+++ b/acinclude.m4 Thu Jul 22 09:24:52 2010 +0100
@@ -221,7 +221,7 @@ AC_DEFUN([WITH_OPENJDK_SRC_DIR],
[
AC_MSG_CHECKING(for an OpenJDK source directory)
AC_ARG_WITH([openjdk-src-dir],
- [AS_HELP_STRING(--with-openjdk-src-dir,specify the location of the openjdk sources)],
+ [AS_HELP_STRING(--with-openjdk-src-dir=DIR,specify the location of the openjdk sources)],
[
OPENJDK_SRC_DIR=${withval}
AC_MSG_RESULT(${withval})
@@ -1028,7 +1028,7 @@ AC_DEFUN([AC_CHECK_FOR_OPENJDK],
[
AC_MSG_CHECKING([for an existing OpenJDK installation])
AC_ARG_WITH([openjdk],
- [AS_HELP_STRING([--with-openjdk],
+ [AS_HELP_STRING([--with-openjdk[=DIR]],
[perform a quick build with an installed copy of OpenJDK])],
[
if test "x${withval}" = xno
@@ -1069,7 +1069,7 @@ AC_DEFUN([AC_CHECK_WITH_TZDATA_DIR],
DEFAULT="/usr/share/javazi"
AC_MSG_CHECKING([which Java timezone data directory to use])
AC_ARG_WITH([tzdata-dir],
- [AS_HELP_STRING(--with-tzdata-dir,set the Java timezone data directory [[default=${DEFAULT}]])],
+ [AS_HELP_STRING(--with-tzdata-dir,set the Java timezone data directory [[default=/usr/share/javazi]])],
[
if test "x${withval}" = x || test "x${withval}" = xyes; then
TZDATA_DIR_SET=yes
@@ -1270,10 +1270,10 @@ AC_MSG_RESULT(${enable_plugin})
AC_DEFUN_ONCE([IT_CHECK_NEW_PLUGIN],
[
-AC_MSG_CHECKING([whether to build the new experimental browser plugin based on npruntime])
+AC_MSG_CHECKING([whether to build the new browser plugin based on npruntime])
AC_ARG_ENABLE([npplugin],
- [AS_HELP_STRING([--enable-npplugin],
- [Enable compilation of browser plugin (automatically disables default plugin)])],
+ [AS_HELP_STRING([--disable-npplugin],
+ [Disable compilation of the new browser plugin (automatically disables default plugin)])],
[enable_npplugin="${enableval}"], [enable_npplugin="yes"])
AC_MSG_RESULT(${enable_npplugin})
])
diff -r 32f3cb4b987b -r 36fc1b3ae030 configure.ac
--- a/configure.ac Wed Jul 21 16:46:23 2010 -0400
+++ b/configure.ac Thu Jul 22 09:24:52 2010 +0100
@@ -128,8 +128,8 @@ AC_MSG_RESULT(${ENABLE_XRENDER})
AC_MSG_CHECKING([whether to include NIO2 support])
AC_ARG_ENABLE([nio2],
- [AS_HELP_STRING([--disable-nio2],
- [Disable inclusion of backported NIO2])],
+ [AS_HELP_STRING([--enable-nio2],
+ [Enable inclusion of backported NIO2])],
[ENABLE_NIO2="${enableval}"], [ENABLE_NIO2='no'])
AM_CONDITIONAL([ENABLE_NIO2], [test x$ENABLE_NIO2 = xyes])
AC_MSG_RESULT(${ENABLE_NIO2})
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