Integrated: 8292226: Prepare make for better Link Time Optimization support

[Julian Waters]

On Thu, 11 Aug 2022 04:18:58 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> The support for Link Time Optimization in the JDK's make system could do with some cleaning up, at the moment it simply assumes the compiler is gcc and sets the flags as such. Instead of introducing changes in bulk, as a first step, it would be good to simply supply the appropriate flags depending on the compiler and refine the flags for the one existing compiler with support for it. In practice the latter just means adding the proper -fuse-linker-plugin to gcc compile step when link-time-opt is specified, as without it the compiler generates both native code and information rich representation for Link Time Optimization. With this flag, native code generation is disabled and object files will contain only code required for Link Time Optimization, thus speeding up compile times as well.

This pull request has now been integrated.

Changeset: 1ed03d82
Author:    Julian Waters <jwaters at openjdk.org>
Committer: Magnus Ihse Bursie <ihse at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/1ed03d82b221d6fa54b855070944aec52366c658
Stats:     10 lines in 2 files changed: 4 ins; 0 del; 6 mod

8292226: Prepare make for better Link Time Optimization support

Reviewed-by: ihse

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PR: https://git.openjdk.org/jdk/pull/9829