Coming soon: JDK 9 Platform/Compiler upgrades at Oracle

[Erik Joelsson]

On 2014-06-10 00:27, Martin Buchholz wrote:
> AFAIK there is no way to build with a newer compiler and remain 
> compatible with older runtimes.
>
> Are you actually using gcc 4.8 built in some magic backward-compatible 
> way or are you using an older gcc?
> If you have magic spells, please share.
>
It depends on what you mean by "runtime". It's true that the version of 
libstdc++ a binary requires depends only on the version of GCC used to 
compile it. When building OracleJDK, Hotspot is already statically 
linking libstdc++ to avoid these kinds of problems. For glibc, it's like 
David Holmes says, we only provide an old glibc so the compiler and 
linker accepts it. No magic unfortunately.

/Erik
>
> On Mon, Jun 9, 2014 at 1:37 AM, Erik Joelsson 
> <erik.joelsson at oracle.com <mailto:erik.joelsson at oracle.com>> wrote:
>
>
>     On 2014-06-07 21:26, Florian Weimer wrote:
>
>         On 06/05/2014 11:46 PM, Tim Bell wrote:
>
>             - Linux - Oracle Linux 6.4 64-bit / GCC 4.8.2
>
>
>         Are you sure the GCC version is correct?
>
>     Yes, we are not using the GCC bundled with the Linux distribution,
>     but have instead opted to create our own compiler package from
>     source. The compiler packages are actually based on Oracle Linux 5
>     so that the built JDK bits will be compatible with older Linux
>     versions without forcing us to run the builds on older OS
>     versions. The scripts used to generate these packages can be found
>     in make/devkit/ in the root repo.
>
>     /Erik
>
>