Integrated: 8304893: Link Time Optimization with gcc can be faster

[Julian Waters]

On Fri, 24 Mar 2023 17:12:26 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> A previous argument against link time optimization support that we have for gcc is that it was extremely slow. After some checks it turns out we are passing rather inefficient flags to gcc in optimized builds. Changing these flags to run the linker optimizations in parallel and passing additional flags to the compiler have the ability to speed this process up significantly. Also fixes some incorrect flags passed to ld for linking as well, since strict-aliasing is required for both linker and compiler, and the same optimization level should be specified instead of letting the default -O1 be passed to the linker

This pull request has now been integrated.

Changeset: aa762102
Author:    Julian Waters <jwaters at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/aa762102e9328ca76663b56b3be6f6141b044744
Stats:     7 lines in 2 files changed: 4 ins; 0 del; 3 mod

8304893: Link Time Optimization with gcc can be faster

Reviewed-by: dholmes, erikj

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PR: https://git.openjdk.org/jdk/pull/13180