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

[David Holmes]

Erik,

There seems to be some confusion as there are two different problems on 
32-bit windows. The build failure as reported in

https://bugs.openjdk.java.net/browse/JDK-8150456

is a build failure in the install phase. The fix you are proposing below 
fixes a runtime failure at VM initialization time.

David
-----

On 24/02/2016 8:50 AM, Erik Joelsson wrote:
> 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