[llvm] [BOLT][NFC] Clarify requirement of PLTCall pass (PR #164280)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-bolt

Author: Gergely Bálint (bgergely0)

<details>
<summary>Changes</summary>

PLTCall does not depend on linking the input with -znow: it sets the
DF_BIND_NOW and/or DF_1_NOW tags for the output binary.
The requirement is that the input contains either FLAGS or FLAGS_1
dynamic entries.

---
Full diff: https://github.com/llvm/llvm-project/pull/164280.diff


1 Files Affected:

- (modified) bolt/lib/Passes/PLTCall.cpp (+1-1) 


``````````diff
diff --git a/bolt/lib/Passes/PLTCall.cpp b/bolt/lib/Passes/PLTCall.cpp
index 90b5f586a7bad..db0e8f93f80ee 100644
--- a/bolt/lib/Passes/PLTCall.cpp
+++ b/bolt/lib/Passes/PLTCall.cpp
@@ -23,7 +23,7 @@ namespace opts {
 extern cl::OptionCategory BoltOptCategory;
 
 static cl::opt<bolt::PLTCall::OptType>
-    PLT("plt", cl::desc("optimize PLT calls (requires linking with -znow)"),
+    PLT("plt", cl::desc("optimize PLT calls (sets DF_BIND_NOW/DF_1_NOW in the output binary)"),
         cl::init(bolt::PLTCall::OT_NONE),
         cl::values(clEnumValN(bolt::PLTCall::OT_NONE, "none",
                               "do not optimize PLT calls"),

``````````

</details>


https://github.com/llvm/llvm-project/pull/164280