From 1918d4bcb21af6a7e4de32073455ac51f2f9673f Mon Sep 17 00:00:00 2001
From: Amir Ayupov <aaupov@fb.com>
Date: Wed, 20 Mar 2024 16:00:11 -0700
Subject: [PATCH] [BOLT][CMake] Build rt library despite unreadable map_files
 (#77876)

Emit a warning and print a suggested workaround.

Fixes https://github.com/llvm/llvm-project/issues/77822.
---
 bolt/CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bolt/CMakeLists.txt b/bolt/CMakeLists.txt
index f163d45342874..cc3a70fa35e0a 100644
--- a/bolt/CMakeLists.txt
+++ b/bolt/CMakeLists.txt
@@ -45,9 +45,9 @@ if (BOLT_ENABLE_RUNTIME)
   execute_process(COMMAND ls /proc/self/map_files
     RESULT_VARIABLE LS OUTPUT_QUIET ERROR_QUIET)
   if (LS)
-    set(BOLT_ENABLE_RUNTIME OFF)
     message(WARNING
-      "BOLT runtime is disabled as /proc/self/map_files is unreadable.")
+      "BOLT runtime may not be able to read /proc/self/map_files. Please use
+      `--instrumentation-binpath <path-to-instrumented-binary>` option.")
   endif()
 endif()