[libc-commits] [libc] [llvm] [libc] Support multilib with runtimes build (PR #115357)

[Petr Hosek via libc-commits]

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@@ -248,10 +248,17 @@ foreach(config_path IN LISTS LIBC_CONFIG_JSON_FILE_LIST)
   load_libc_config(${config_path}/config.json ${cmd_line_conf})
 endforeach()
 
+if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+  set(LIBC_TARGET_SUBDIR ${LLVM_DEFAULT_TARGET_TRIPLE})
+  if(LIBC_LIBDIR_SUBDIR)
+    string(APPEND LIBC_TARGET_SUBDIR /${LIBC_LIBDIR_SUBDIR})
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petrhosek wrote:

This is set by the bootstrapping build here:
https://github.com/llvm/llvm-project/blob/7b5e285d16090c2ddf4ee539c410d24bde52cbea/llvm/runtimes/CMakeLists.txt#L636
The name comes from `LLVM_RUNTIME_MULTILIBS`.

https://github.com/llvm/llvm-project/pull/115357