A recent change, JDK-8029007 introduced JNU_ThrowOutOfMemoryError into MessageUtils. The Windows x86 build subsequently fails as follows:

Warning (shows the root cause):
c:/jprt/T/P1/113753.chhegar/s/jdk/src/share/native/sun/misc/MessageUtils.c(58) : warning C4013: 'JNU_ThrowOutOfMemoryError' undefined; assuming extern returning int

Actual linkage failure:
## Starting jdk
Compiling 9620 files for BUILD_JDK
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Compiling 235 files for BUILD_SECURITY
Compiling 2 files for BUILD_ACCESSBRIDGE_32
Compiling 2 files for BUILD_ACCESSBRIDGE_LEGACY
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
MessageUtils.c
c:/cygwin/home/chhegar/sbdata/repos/jdk9/dev/dev/jdk/src/share/native/sun/misc/MessageUtils.c(58) : warning C4013: 'JNU_ThrowOutOfMemoryError' undefined; assuming extern returning int
VM.c
Version.c
   Creating library c:/cygwin/home/chhegar/sbdata/repos/jdk9/dev/dev/build/windows-x86-normal-server-release/jdk/objs/libjava/java.lib and object c:/cygwin/home/chhegar/sbdata/repos/jdk9/dev/dev/build/windows-x86-normal-server-release/jdk/objs/libjava/java.exp
MessageUtils.obj : error LNK2019: unresolved external symbol _JNU_ThrowOutOfMemoryError referenced in function _printToFile
c:/cygwin/home/chhegar/sbdata/repos/jdk9/dev/dev/build/windows-x86-normal-server-release/jdk/bin/java.dll : fatal error LNK1120: 1 unresolved externals
lib/CoreLibraries.gmk:185: recipe for target `/cygdrive/c/cygwin/home/chhegar/sbdata/repos/jdk9/dev/dev/build/windows-x86-normal-server-release/jdk/bin/java.dll' failed
make[2]: *** [/cygdrive/c/cygwin/home/chhegar/sbdata/repos/jdk9/dev/dev/build/windows-x86-normal-server-release/jdk/bin/java.dll] Error 96
BuildJdk.gmk:70: recipe for target `libs-only' failed
make[1]: *** [libs-only] Error 2
/cygdrive/c/cygwin/home/chhegar/sbdata/repos/jdk9/dev/dev//make/Main.gmk:115: recipe for target `jdk-only' failed
make: *** [jdk-only] Error 2