[libc] [llvm] [libc] Make RPC server handling header only (PR #131205)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

> This commit broke standalone offload builds:
> 
> ```
> [64/78] /usr/lib/ccache/bin/x86_64-pc-linux-gnu-g++ -DDEBUG_PREFIX=\"PluginInterface\" -DTARGET_NAME=\"PluginInterface\" -I/usr/lib/llvm/21/include -I/var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload/plugins-nextgen/common/include -I/var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload_build/include -I/var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload/include  -O2 -pipe -march=native -std=c++17 -fPIC -fno-exceptions -MD -MT plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o -MF plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o.d -o plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o -c /var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload/plugins-nextgen/common/src/RPC.cpp
> FAILED: plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o 
> /usr/lib/ccache/bin/x86_64-pc-linux-gnu-g++ -DDEBUG_PREFIX=\"PluginInterface\" -DTARGET_NAME=\"PluginInterface\" -I/usr/lib/llvm/21/include -I/var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload/plugins-nextgen/common/include -I/var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload_build/include -I/var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload/include  -O2 -pipe -march=native -std=c++17 -fPIC -fno-exceptions -MD -MT plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o -MF plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o.d -o plugins-nextgen/common/CMakeFiles/PluginCommon.dir/src/RPC.cpp.o -c /var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload/plugins-nextgen/common/src/RPC.cpp
> /var/tmp/portage/llvm-runtimes/offload-21.0.0.9999/work/offload/plugins-nextgen/common/src/RPC.cpp:16:10: fatal error: shared/rpc.h: No such file or directory
>    16 | #include "shared/rpc.h"
>       |          ^~~~~~~~~~~~~~
> compilation terminated.
> ```
> 
> Looks like it's missing an include directory.

Uhh, do those go through the runtime build? I think that might be a side-effect of me moving where the `FindLLVMLibcCommonUtils.cmake` file lived. It used to be in `runtimes/` but I put it in `llvm`. If you copy it back does it work?

https://github.com/llvm/llvm-project/pull/131205