RFR: JDK-8200738 Use --hash-style=gnu for gcc

[Erik Joelsson]

Looks good.

/Erik

On 2020-06-12 08:42, Magnus Ihse Bursie wrote:
> When support for gnu hash tables were added to the gcc toolchains, the 
> OpenJDK build system added a hack to change --hash-style=gnu to 
> --hash-style=both unconditionally, citing compatibility concerns.
>
> --hash-style=gnu has a very slight performance advantage over 
> --hash-style=both (very small static footprint reductions, tiny 
> startup cost differences). Both --hash-style=gnu and --hash-style=both 
> have a small to potentially large performance advantage over 
> --hash-style=sysv
>
> We should only use --hash-style=gnu. It's been the default in Ubuntu's 
> build of gcc since gcc 4.4[1], and likely similar in other distros.
>
> I also removed LIBJSIG_NOEXECSTACK_LDFLAGS which is no longer used.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8200738
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8200738-use-hash-style-gnu/webrev.01
>
> /Magnus
>
> [1] https://launchpad.net/ubuntu/maverick/+source/gcc-4.4/+changelog
>