RFR: 8348207: Linux PPC64 PCH build broken after JDK-8347909

[Magnus Ihse Bursie]

On Thu, 23 Jan 2025 12:59:19 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The Linux PPC64 PCH build was broken after JDK-8347909.
> Build error
> 
> * For target hotspot_variant-server_libjvm_objs_sharedRuntimeTrans.o:
> cc1plus: error: /jdk25_opt/hotspot/variant-server/libjvm/objs/precompiled/precompiled.hpp.gch: created and used with differing settings of '-mpower8-fusion-sign' [-Werror=invalid-pch]
> cc1plus: error: one or more PCH files were found, but they were invalid
> <command-line>: fatal error: precompiled.hpp: No such file or directory
> 
> * For target hotspot_variant-server_libjvm_objs_sharedRuntimeTrig.o:
> cc1plus: error: /jdk25_opt/hotspot/variant-server/libjvm/objs/precompiled/precompiled.hpp.gch: created and used with differing settings of '-mpower8-fusion-sign' [-Werror=invalid-pch]
> cc1plus: error: one or more PCH files were found, but they were invalid
> <command-line>: fatal error: precompiled.hpp: No such file or directory
> 
> 
> There was a mismatch of the build settings of  precompiled.hpp.gch and these 2 compilation units leading to this error;  the PCH build exclusion of these 2 files did not work.

I just fixed the same issue in https://github.com/openjdk/jdk/pull/23283. I chose a more conservative path, so I'd only affect ppc64 code.

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PR Comment: https://git.openjdk.org/jdk/pull/23268#issuecomment-2611244863