RFR: JDK-8150456: jdk 9 nightly build fails on Windows 32 bit

[Erik Joelsson]

The windows 32 bit build is currently DOA.

In JDK-8150203, the following build warning on Windows x64 was eliminated:

CRC32.c: warning LNK4197: export 'ZIP_CRC32' specified multiple times; 
using first specification

This warning is emitted because the function both has a JNIEXPORT 
declaration and a link time -export:ZIP_CRC32. The change removed the 
-export link flag which removed the warning.

On Windows x86, removing the explicit -export link flag is causing 
trouble. Just using JNIEXPORT (or really __declspec(dllexport)) is not 
the same thing as the link flag -export. The first will export 
_ZIP_CRC32 and the second ZIP_CRC32. In hotspot, jvm.dll will look for 
the symbol ZIP_CRC32 and will fail without the -export link flag.

My proposed fix is to readd the -export and remove the JNIEXPORT from 
this function. This would mimic the pattern of the other exported 
symbols in this library.

Bug: https://bugs.openjdk.java.net/browse/JDK-8150456
Patch:
diff -r 9d536355b828 make/lib/CoreLibraries.gmk
--- a/make/lib/CoreLibraries.gmk        Tue Feb 23 09:49:04 2016 +0100
+++ b/make/lib/CoreLibraries.gmk        Tue Feb 23 23:49:10 2016 +0100
@@ -225,7 +225,7 @@
          $(call SET_SHARED_LIBRARY_ORIGIN), \
      LDFLAGS_windows := -export:ZIP_Open -export:ZIP_Close 
-export:ZIP_FindEntry \
          -export:ZIP_ReadEntry -export:ZIP_GetNextEntry \
-        -export:ZIP_InflateFully, \
+        -export:ZIP_InflateFully -export:ZIP_CRC32, \
      LIBS_unix := -ljvm -ljava $(LIBZ), \
      LIBS_solaris := -lc, \
      LIBS_windows := jvm.lib $(WIN_JAVA_LIB), \
diff -r 9d536355b828 src/java.base/share/native/libzip/CRC32.c
--- a/src/java.base/share/native/libzip/CRC32.c Tue Feb 23 09:49:04 2016 
+0100
+++ b/src/java.base/share/native/libzip/CRC32.c Tue Feb 23 23:49:10 2016 
+0100
@@ -54,7 +54,7 @@
      return crc;
  }

-JNIEXPORT jint JNICALL
+jint JNICALL
  ZIP_CRC32(jint crc, const jbyte *buf, jint len)
  {
      return crc32(crc, (Bytef*)buf, len);

/Erik