RFR: 8349638: Build libjdwp with SIZE optimization

[Julian Waters]

On Tue, 11 Feb 2025 15:56:39 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The libjdwp is currently built with LOW optimization level, it could be built with SIZE optimization to lower the lib size by ~ 10 % on UNIX.
> On Windows LOW and SIZE currently translate to the same O1 optimization flag so no difference there.
> 
> On Linux x86_64 for example the lib shrinks from
> 300K to 268K and the debuginfo file shrinks from 1.9M to 1.7M .
> 
> On Linux ppc64le for example the lib shrinks from
> 428K to 368K and the debuginfo file shrinks from 2.0M to 1.7M .

Just a heads up, there is a known issue with -Os and gcc (-Os turns on -fdeclone-ctor-dtor which causes the problem), especially if LTO is active. Turning more optimization levels to -Os could present a problem if you want to have LTO support for the JDK's native code outside of HotSpot as was discussed elsewhere

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PR Comment: https://git.openjdk.org/jdk/pull/23563#issuecomment-2651543730