hardcoding -m32/-m64 is more harmful than using the toolchain defaults

[Andrew Haley]

On 27/10/15 20:36, Martin Buchholz wrote:
> The world would be a better place if the current x86 32-bit ABI was
> replaced by "x32"
> https://en.wikipedia.org/wiki/X32_ABI
> but it's looking unlikely that we will get there.  For starters, all
> compilers must be rewritten to target x32, and that includes the jdk
> jits.

No they wouldn't.  The jits don't have to be changed at all because we
already can handle compressed OOPs with no shift or base offset,
i.e. native 32-bit addresses.  The Java calling convention would
therefore stay as it is.  All that would have to be changed is the
native <-> Java interfaces and accesses to native pointer-sized fields
in C++ structures.  It's not trivial, but neither is it a rewrite.

Andrew.