--- old/make/autoconf/flags-cflags.m4	2020-06-04 23:38:54.804404759 -0400
+++ new/make/autoconf/flags-cflags.m4	2020-06-04 23:38:54.380390365 -0400
@@ -522,6 +522,18 @@
   fi
   TOOLCHAIN_CFLAGS_JDK_CONLY="$LANGSTD_CFLAGS $TOOLCHAIN_CFLAGS_JDK_CONLY"
 
+  # CXXFLAGS C++ language level for all of JDK, including Hotspot.
+  if test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang || test "x$TOOLCHAIN_TYPE" = xxlc; then
+    LANGSTD_CXXFLAGS="-std=c++14"
+  elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+    LANGSTD_CXXFLAGS="-std:c++14"
+  else
+    AC_MSG_ERROR([Don't know how to enable C++14 for this toolchain])
+  fi
+  TOOLCHAIN_CFLAGS_JDK_CXXONLY="$TOOLCHAIN_CFLAGS_JDK_CXXONLY $LANGSTD_CXXFLAGS"
+  TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM $LANGSTD_CXXFLAGS"
+  ADLC_LANGSTD_CXXFLAGS="$LANGSTD_CXXFLAGS"
+
   # CFLAGS WARNINGS STUFF
   # Set JVM_CFLAGS warning handling
   if test "x$TOOLCHAIN_TYPE" = xgcc; then
@@ -704,13 +716,6 @@
       $1_CFLAGS_CPU_JDK="${$1_CFLAGS_CPU_JDK} -fno-omit-frame-pointer"
     fi
 
-    $1_CXXSTD_CXXFLAG="-std=gnu++98"
-    FLAGS_CXX_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [${$1_CXXSTD_CXXFLAG}],
-        PREFIX: $3, IF_FALSE: [$1_CXXSTD_CXXFLAG=""])
-    $1_TOOLCHAIN_CFLAGS_JDK_CXXONLY="${$1_CXXSTD_CXXFLAG}"
-    $1_TOOLCHAIN_CFLAGS_JVM="${$1_TOOLCHAIN_CFLAGS_JVM} ${$1_CXXSTD_CXXFLAG}"
-    $2ADLC_CXXFLAG="${$1_CXXSTD_CXXFLAG}"
-
   elif test "x$TOOLCHAIN_TYPE" = xclang; then
     if test "x$FLAGS_OS" = xlinux; then
       # ppc test not really needed for clang
@@ -805,7 +810,7 @@
   AC_SUBST($2CFLAGS_JDKEXE)
   AC_SUBST($2CXXFLAGS_JDKLIB)
   AC_SUBST($2CXXFLAGS_JDKEXE)
-  AC_SUBST($2ADLC_CXXFLAG)
+  AC_SUBST($2ADLC_LANGSTD_CXXFLAGS)
 
   COMPILER_FP_CONTRACT_OFF_FLAG="-ffp-contract=off"
   # Check that the compiler supports -ffp-contract=off flag
--- old/make/autoconf/flags-ldflags.m4	2020-06-04 23:38:55.956443866 -0400
+++ new/make/autoconf/flags-ldflags.m4	2020-06-04 23:38:55.536429608 -0400
@@ -53,6 +53,7 @@
 
   LDFLAGS_TESTEXE="${TARGET_LDFLAGS_JDK_LIBPATH}"
   AC_SUBST(LDFLAGS_TESTEXE)
+  AC_SUBST(ADLC_LDFLAGS)
 ])
 
 ################################################################################
--- old/make/autoconf/lib-std.m4	2020-06-04 23:38:57.096482565 -0400
+++ new/make/autoconf/lib-std.m4	2020-06-04 23:38:56.676468307 -0400
@@ -70,6 +70,7 @@
     else
       LIBCXX="$LIBCXX $STATIC_STDCXX_FLAGS"
       JVM_LDFLAGS="$JVM_LDFLAGS $STATIC_STDCXX_FLAGS"
+      ADLC_LDFLAGS="$ADLC_LDFLAGS $STATIC_STDCXX_FLAGS"
       # Ideally, we should test stdc++ for the BUILD toolchain separately. For now
       # just use the same setting as for the TARGET toolchain.
       OPENJDK_BUILD_JVM_LDFLAGS="$OPENJDK_BUILD_JVM_LDFLAGS $STATIC_STDCXX_FLAGS"
--- old/make/autoconf/spec.gmk.in	2020-06-04 23:38:58.248521672 -0400
+++ new/make/autoconf/spec.gmk.in	2020-06-04 23:38:57.824507279 -0400
@@ -476,7 +476,8 @@
 WARNINGS_AS_ERRORS := @WARNINGS_AS_ERRORS@
 
 CFLAGS_CCACHE:=@CFLAGS_CCACHE@
-ADLC_CXXFLAG=@ADLC_CXXFLAG@
+ADLC_LANGSTD_CXXFLAGS=@ADLC_LANGSTD_CXXFLAGS@
+ADLC_LDFLAGS=@ADLC_LDFLAGS@
 
 # Tools that potentially need to be cross compilation aware.
 CC:=@FIXPATH@ @CCACHE@ @ICECC@ @CC@
--- old/make/autoconf/toolchain.m4	2020-06-04 23:38:59.396560643 -0400
+++ new/make/autoconf/toolchain.m4	2020-06-04 23:38:58.976546385 -0400
@@ -50,9 +50,9 @@
 TOOLCHAIN_DESCRIPTION_xlc="IBM XL C/C++"
 
 # Minimum supported versions, empty means unspecified
-TOOLCHAIN_MINIMUM_VERSION_clang="3.2"
+TOOLCHAIN_MINIMUM_VERSION_clang="3.5"
 TOOLCHAIN_MINIMUM_VERSION_gcc="5.0"
-TOOLCHAIN_MINIMUM_VERSION_microsoft="16.00.30319.01" # VS2010
+TOOLCHAIN_MINIMUM_VERSION_microsoft="19.10.0.0" # VS2017
 TOOLCHAIN_MINIMUM_VERSION_xlc=""
 
 # Minimum supported linker versions, empty means unspecified
--- old/make/autoconf/toolchain_windows.m4	2020-06-04 23:39:00.540599478 -0400
+++ new/make/autoconf/toolchain_windows.m4	2020-06-04 23:39:00.116585085 -0400
@@ -25,55 +25,7 @@
 
 ################################################################################
 # The order of these defines the priority by which we try to find them.
-VALID_VS_VERSIONS="2019 2017 2013 2015 2012 2010"
-
-VS_DESCRIPTION_2010="Microsoft Visual Studio 2010"
-VS_VERSION_INTERNAL_2010=100
-VS_MSVCR_2010=msvcr100.dll
-# We don't use msvcp on Visual Studio 2010
-#VS_MSVCP_2010=msvcp100.dll
-VS_ENVVAR_2010="VS100COMNTOOLS"
-VS_VS_INSTALLDIR_2010="Microsoft Visual Studio 10.0"
-VS_SDK_INSTALLDIR_2010="Microsoft SDKs/Windows/v7.1"
-VS_VS_PLATFORM_NAME_2010="v100"
-VS_SDK_PLATFORM_NAME_2010="Windows7.1SDK"
-VS_SUPPORTED_2010=false
-
-VS_DESCRIPTION_2012="Microsoft Visual Studio 2012"
-VS_VERSION_INTERNAL_2012=110
-VS_MSVCR_2012=msvcr110.dll
-VS_MSVCP_2012=msvcp110.dll
-VS_ENVVAR_2012="VS110COMNTOOLS"
-VS_VS_INSTALLDIR_2012="Microsoft Visual Studio 11.0"
-VS_SDK_INSTALLDIR_2012=
-VS_VS_PLATFORM_NAME_2012="v110"
-VS_SDK_PLATFORM_NAME_2012=
-VS_SUPPORTED_2012=false
-
-VS_DESCRIPTION_2013="Microsoft Visual Studio 2013"
-VS_VERSION_INTERNAL_2013=120
-VS_MSVCR_2013=msvcr120.dll
-VS_MSVCP_2013=msvcp120.dll
-VS_ENVVAR_2013="VS120COMNTOOLS"
-VS_VS_INSTALLDIR_2013="Microsoft Visual Studio 12.0"
-VS_SDK_INSTALLDIR_2013=
-VS_VS_PLATFORM_NAME_2013="v120"
-VS_SDK_PLATFORM_NAME_2013=
-VS_SUPPORTED_2013=false
-
-VS_DESCRIPTION_2015="Microsoft Visual Studio 2015"
-VS_VERSION_INTERNAL_2015=140
-VS_MSVCR_2015=vcruntime140.dll
-VS_MSVCP_2015=msvcp140.dll
-VS_ENVVAR_2015="VS140COMNTOOLS"
-VS_VS_INSTALLDIR_2015="Microsoft Visual Studio 14.0"
-VS_SDK_INSTALLDIR_2015=
-VS_VS_PLATFORM_NAME_2015="v140"
-VS_SDK_PLATFORM_NAME_2015=
-# The vcvars of 2015 breaks if 2017 is also installed. Work around this by
-# explicitly specifying Windows Kit 8.1 to be used.
-VS_ENV_ARGS_2015="8.1"
-VS_SUPPORTED_2015=false
+VALID_VS_VERSIONS="2019 2017"
 
 VS_DESCRIPTION_2017="Microsoft Visual Studio 2017"
 VS_VERSION_INTERNAL_2017=141
--- old/make/hotspot/gensrc/GensrcAdlc.gmk	2020-06-04 23:39:01.692638586 -0400
+++ new/make/hotspot/gensrc/GensrcAdlc.gmk	2020-06-04 23:39:01.268624192 -0400
@@ -37,18 +37,18 @@
   ifeq ($(call isBuildOs, linux), true)
     ADLC_CFLAGS := -fno-exceptions -DLINUX
   else ifeq ($(call isBuildOs, aix), true)
-    ADLC_LDFLAGS := -q64
+    ADLC_LDFLAGS += -q64
     ADLC_CFLAGS := -qnortti -qeh -q64 -DAIX
   else ifeq ($(call isBuildOs, windows), true)
-    ADLC_LDFLAGS := -nologo
+    ADLC_LDFLAGS += -nologo
     ADLC_CFLAGS := -nologo -EHsc
     # NOTE: The old build also have -D_CRT_SECURE_NO_DEPRECATE but it doesn't
     # seem needed any more.
     ADLC_CFLAGS_WARNINGS := -W3 -D_CRT_SECURE_NO_WARNINGS
   endif
 
-  # Set the C++ standard if supported
-  ADLC_CFLAGS += $(ADLC_CXXFLAG)
+  # Set the C++ standard
+  ADLC_CFLAGS += $(ADLC_LANGSTD_CXXFLAG)
 
   # NOTE: The old build didn't set -DASSERT for windows but it doesn't seem to
   # hurt.
--- old/make/modules/jdk.hotspot.agent/Lib.gmk	2020-06-04 23:39:02.836677421 -0400
+++ new/make/modules/jdk.hotspot.agent/Lib.gmk	2020-06-04 23:39:02.416663163 -0400
@@ -66,6 +66,7 @@
     CXXFLAGS := $(CXXFLAGS_JDKLIB) $(SA_CFLAGS) $(SA_CXXFLAGS), \
     EXTRA_SRC := $(LIBSA_EXTRA_SRC), \
     LDFLAGS := $(LDFLAGS_JDKLIB), \
+    LIBS := $(LIBCXX), \
     LIBS_linux := $(LIBDL), \
     LIBS_macosx := -framework Foundation -framework JavaNativeFoundation \
         -framework JavaRuntimeSupport -framework Security -framework CoreFoundation, \