[llvm] [llvm-split][nfc] Harmonize help and error message (PR #120062)

[via llvm-commits]

https://github.com/serge-sans-paille created https://github.com/llvm/llvm-project/pull/120062

Somme error / help message refer to options with a single dash while help refer to options with a double dash.

>From aacf56b1c092cff662bc5a91f5421c4816210a98 Mon Sep 17 00:00:00 2001
From: serge-sans-paille <sguelton at mozilla.com>
Date: Mon, 16 Dec 2024 10:51:53 +0100
Subject: [PATCH] [llvm-split][nfc] Harmonize help and error message

Somme error / help message refer to options with a single dash while
help refer to options with a double dash.
---
 llvm/tools/llvm-split/llvm-split.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/llvm/tools/llvm-split/llvm-split.cpp b/llvm/tools/llvm-split/llvm-split.cpp
index c456403e6bc68d..1b1f97f44e2742 100644
--- a/llvm/tools/llvm-split/llvm-split.cpp
+++ b/llvm/tools/llvm-split/llvm-split.cpp
@@ -67,7 +67,7 @@ static cl::opt<std::string>
             cl::value_desc("triple"), cl::cat(SplitCategory));
 
 static cl::opt<std::string>
-    MCPU("mcpu", cl::desc("Target CPU, ignored if -mtriple is not used"),
+    MCPU("mcpu", cl::desc("Target CPU, ignored if --mtriple is not used"),
          cl::value_desc("cpu"), cl::cat(SplitCategory));
 
 int main(int argc, char **argv) {
@@ -125,11 +125,11 @@ int main(int argc, char **argv) {
 
   if (TM) {
     if (PreserveLocals) {
-      errs() << "warning: -preserve-locals has no effect when using "
+      errs() << "warning: --preserve-locals has no effect when using "
                 "TargetMachine::splitModule\n";
     }
     if (RoundRobin)
-      errs() << "warning: -round-robin has no effect when using "
+      errs() << "warning: --round-robin has no effect when using "
                 "TargetMachine::splitModule\n";
 
     if (TM->splitModule(*M, NumOutputs, HandleModulePart))