fix(turboquant): resolve common.h by detecting llama-common vs common target (#9413)

The shared grpc-server CMakeLists hardcoded `llama-common`, the post-rename
target name in upstream llama.cpp. The turboquant fork branched before that
rename and still exposes the helpers library as `common`, so the name
silently degraded to a plain `-llama-common` link flag, the PUBLIC include
directory was never propagated, and tools/server/server-task.h failed to
find common.h during turboquant-<flavor> builds.

Author: mudler

backend/cpp/llama-cpp/CMakeLists.txt

@@ -62,7 +62,18 @@ add_executable(${TARGET} grpc-server.cpp json.hpp httplib.h)
 target_include_directories(${TARGET} PRIVATE ../llava)
 target_include_directories(${TARGET} PRIVATE ${CMAKE_SOURCE_DIR})
 
-target_link_libraries(${TARGET} PRIVATE llama-common llama mtmd ${CMAKE_THREAD_LIBS_INIT} absl::flags hw_grpc_proto
+# Upstream llama.cpp renamed the `common` helpers library to `llama-common`.
+# Forks that branched before the rename (e.g. llama-cpp-turboquant) still
+# expose it as `common`. Detect which one is present so the same CMakeLists
+# drives both builds — otherwise an unresolved name silently degrades to a
+# plain `-l` flag and the PUBLIC include dir (where common.h lives) is lost.
+if (TARGET llama-common)
+    set(_LLAMA_COMMON_TARGET llama-common)
+else()
+    set(_LLAMA_COMMON_TARGET common)
+endif()
+
+target_link_libraries(${TARGET} PRIVATE ${_LLAMA_COMMON_TARGET} llama mtmd ${CMAKE_THREAD_LIBS_INIT} absl::flags hw_grpc_proto
   absl::flags_parse
   gRPC::${_REFLECTION}
   gRPC::${_GRPC_GRPCPP}