[CMake][NFC] Add comment about new `--gdb-index` option used with `-gsplit-dwarf`
Follow-up of https://reviews.llvm.org/D108776
diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index c7fdc03..b9fc95b 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -503,7 +503,7 @@
"Path to fuzzing library for linking with fuzz targets")
option(LLVM_USE_SPLIT_DWARF
- "Use -gsplit-dwarf when compiling llvm." OFF)
+ "Use -gsplit-dwarf when compiling llvm and --gdb-index when linking." OFF)
# Define an option controlling whether we should build for 32-bit on 64-bit
# platforms, where supported.
