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
