8307573: Implementation of JEP 449: Deprecate the Windows 32-bit x86 Port for Removal

Reviewed-by: erikj

Author: gdams

doc/building.html

@@ -324,6 +324,7 @@ <h3 id="building-on-x86">Building on x86</h3>
 <p>Even for 32-bit builds, it is recommended to use a 64-bit build
 machine, and instead create a 32-bit target using
 <code>--with-target-bits=32</code>.</p>
+<p>Note: The Windows 32-bit x86 port is deprecated and may be removed in a future release.</p>
 <h3 id="building-on-aarch64">Building on aarch64</h3>
 <p>At a minimum, a machine with 8 cores is advisable, as well as 8 GB of
 RAM. (The more cores to use, the more memory you need.) At least 6 GB of
@@ -400,6 +401,7 @@ <h3 id="windows">Windows</h3>
 use <code>--with-msvcr-dll=/cygdrive/c/msvcr100.dll</code> rather than
 <code>--with-msvcr-dll=c:\msvcr100.dll</code>. For details on this
 conversion, see the section on <a href="#fixpath">Fixpath</a>.</p>
+<p>Note: The Windows 32-bit x86 port is deprecated and may be removed in a future release.</p>
 <h4 id="cygwin">Cygwin</h4>
 <p>A functioning <a href="http://www.cygwin.com/">Cygwin</a> environment
 is required for building the JDK on Windows. If you have a 64-bit OS, we

doc/building.md

@@ -126,6 +126,8 @@ space is required.
 Even for 32-bit builds, it is recommended to use a 64-bit build machine, and
 instead create a 32-bit target using `--with-target-bits=32`.
 
+Note: The Windows 32-bit x86 port is deprecated and may be removed in a future release.
+
 ### Building on aarch64
 
 At a minimum, a machine with 8 cores is advisable, as well as 8 GB of RAM.
@@ -199,6 +201,8 @@ rule also applies to input to the build system, e.g. in arguments to
 `--with-msvcr-dll=c:\msvcr100.dll`. For details on this conversion, see the section
 on [Fixpath](#fixpath).
 
+Note: The Windows 32-bit x86 port is deprecated and may be removed in a future release.
+
 #### Cygwin
 
 A functioning [Cygwin](http://www.cygwin.com/) environment is required for

make/autoconf/platform.m4

@@ -657,6 +657,22 @@ AC_DEFUN_ONCE([PLATFORM_SETUP_OPENJDK_BUILD_AND_TARGET],
   PLATFORM_SET_MODULE_TARGET_OS_VALUES
   PLATFORM_SET_RELEASE_FILE_OS_VALUES
   PLATFORM_SETUP_LEGACY_VARS
+  PLATFORM_CHECK_DEPRECATION
+])
+
+AC_DEFUN_ONCE([PLATFORM_CHECK_DEPRECATION],
+[
+  AC_ARG_ENABLE(deprecated-ports, [AS_HELP_STRING([--enable-deprecated-ports@<:@=yes/no@:>@],
+       [Suppress the error when configuring for a deprecated port @<:@no@:>@])])
+  AC_REQUIRE([PLATFORM_EXTRACT_TARGET_AND_BUILD])
+  if test "x$OPENJDK_TARGET_OS" = xwindows && test "x$OPENJDK_TARGET_CPU" = xx86; then
+    if test "x$enable_deprecated_ports" = "xyes"; then
+      AC_MSG_WARN([The Windows 32-bit x86 port is deprecated and may be removed in a future release.])
+    else
+      AC_MSG_ERROR(m4_normalize([The Windows 32-bit x86 port is deprecated and may be removed in a future release.
+        Use --enable-deprecated-ports=yes to suppress this error.]))
+    fi
+  fi
 ])
 
 AC_DEFUN_ONCE([PLATFORM_SETUP_OPENJDK_BUILD_OS_VERSION],