RFR: 8352284: EXTRA_CFLAGS incorrectly applied to BUILD_LIBJVM src/hotspot C++ source files [v2]

[Patrick Zhang]

On Mon, 31 Mar 2025 13:24:25 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>>> 3. Fixed `STATIC_LIB_CFLAGS` in `Flags.gmk` to `-DSTATIC_BUILD=1`, which was missed by [cbab40bc](https://github.com/openjdk/jdk/commit/cbab40bce45a2f58906be49c841178fa1dfd457e#diff-ab3ce05e795360030f19402fd0c2fad1dc1f7c5e7acc993cc4a2096cf31ccf40R114-R121) for the refactor of building static libs. 
>> 
>> Unrelated, after the fix got limited to `JvmFlags.gmk` only.
>> However, it is a practical bug, and existing tests did not cover the corner case. As described in the No.3 bullet of this PR. The problem showed up when I tested applying `EXTRA_CXXFLAGS to `precompiled.hpp.gch`. It is a simple and tiny fix which may not require a separate PR I thought, does it?
>> 
>> FYI, the failures on linux-x64-static and linux-x64-static-libs tests, captured by OpenJDK GHA Sanity Checks: https://github.com/cnqpzhang/jdk/actions/runs/13943096440.
>
> You are correct that this is a bug, but the fix should not be sneaked in under the guise of another problem.
> 
> I created https://bugs.openjdk.org/browse/JDK-8353272 for this.

Reverted the fix. Thanks for helping file a new JBS and follow-ups.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/24115#discussion_r2021172025