RFR: 8365231: Don't build gtest with /EHsc

[Kim Barrett]

On Mon, 11 Aug 2025 09:55:20 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> According to https://github.com/openjdk/jdk/pull/26661#issuecomment-3162014034, we should not build gtest with `/EHsc`. 
> 
> I can honestly say I don't fully understand the consequences of this change, but at least it passes building and testing on Oracle CI. And it does seem to make sense that we build the gtest version of libjvm as close as possible to the real version. For libgtest I just thought it was prudent to keep the flags in sync with how we build libjvm. This might not be the correct decision.
> 
> I have not tested how or if this affects the ability for gtest to handle bugs or crashes in the JVM, nor do I really have any idea about any such consequences. This PR is opened more to start a discussion than with the intention of just integrating this.

make/hotspot/lib/CompileGtest.gmk line 112:

> 110:     DISABLED_WARNINGS_clang_test_g1ServiceThread.cpp := delete-abstract-non-virtual-dtor, \
> 111:     DISABLED_WARNINGS_clang_test_logDecorations.cpp := missing-field-initializers, \
> 112:     DISABLED_WARNINGS_microsoft := $(DISABLED_WARNINGS_microsoft) 4530, \

How widespread are these warnings? I expect such a warning from jfr/test_networkUtilization.cpp,
but not anywhere else. Could the disable of this warning be narrowed accordingly?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26721#discussion_r2276648787