[llvm-libtool-darwin] Improve warning message for no symbols

This more closely mirrors apple's libtool, and also potentially makes it
clearer for multi-arch archives where the issue lies.

Differential Revision: https://reviews.llvm.org/D118867

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp b/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp
index 9355d38..a5c664c 100644
--- a/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp
+++ b/llvm/tools/llvm-libtool-darwin/llvm-libtool-darwin.cpp
@@ -360,8 +360,9 @@ private:
 
       auto *O = dyn_cast<MachOObjectFile>(ObjOrErr->get());
       uint32_t FileCPUType, FileCPUSubtype;
+      StringRef ArchName = O->getArchTriple().getArchName();
       std::tie(FileCPUType, FileCPUSubtype) = MachO::getCPUTypeFromArchitecture(
-          MachO::getArchitectureFromName(O->getArchTriple().getArchName()));
+          MachO::getArchitectureFromName(ArchName));
 
       // If -arch_only is specified then skip this file if it doesn't match
       // the architecture specified.
@@ -370,7 +371,9 @@ private:
       }
 
       if (!NoWarningForNoSymbols && O->symbols().empty())
-        WithColor::warning() << Member.MemberName + " has no symbols\n";
+        WithColor::warning() << "'" + Member.MemberName +
+                                    "': has no symbols for architecture " +
+                                    ArchName + "\n";
 
       uint64_t FileCPUID = getCPUID(FileCPUType, FileCPUSubtype);
       Builder.Data.MembersPerArchitecture[FileCPUID].push_back(