RFR: JDK-8167479: arm 32/64 slowdebug fails to build on unpack200

[David Holmes]

On 11/10/2016 7:41 PM, Erik Joelsson wrote:
> Hello,
>
> After the cleanup of C++ linking with the GCC toolchain. We missed
> updating one instance with the correct TOOLCHAIN configuration. This
> leads to build failures for arm ports with slowdebug. I have no idea why
> it only happens there, but correcting the TOOLCHAIN configuration (so
> that g++ is used to link instead of gcc) makes it build again.

Unexplained errors raise alarm bells for me. This particular reference 
relates to C++ exception handling which raises questions:

- why only on this platform?
- why only in slowdebug?
- why only in this code? (which seems unrelated to exceptions)

I agree the fix is to use g++ instead of gcc for linking, assuming the 
exception related code should actually be there.

Thanks,
David

> The build error looks like this:
>
> /localhome/hg/jdk9-dev-CDR/build/linux-arm64-slowdebug/support/native/jdk.pack200/unpackexe/bands.o:(.data.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]+0x0):
> undefined reference to `__gxx_personality_v0'
> collect2: error: ld returned 1 exit status
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8167479
>
> Webrev: http://cr.openjdk.java.net/~erikj/8167479/webrev.01/
>
> /Erik
>