gn build: Document llvm_enable_dia_sdk variable better

llvm-svn: 359196

diff --git a/llvm/utils/gn/secondary/llvm/lib/DebugInfo/PDB/enable_dia.gni b/llvm/utils/gn/secondary/llvm/lib/DebugInfo/PDB/enable_dia.gni
index 9d397bc..aed3566 100644 (file)
--- a/llvm/utils/gn/secondary/llvm/lib/DebugInfo/PDB/enable_dia.gni
+++ b/llvm/utils/gn/secondary/llvm/lib/DebugInfo/PDB/enable_dia.gni
@@ -1,4 +1,6 @@
 declare_args() {
   # Whether to build code that requires the Microsoft DIA SDK.
+  # If this is set, %INCLUDE% must contain ".../DIA SDK/include"
+  # and %LIB% must contain ".../DIA SKD/lib/amd64".
   llvm_enable_dia_sdk = false
 }