[lld-macho] Include install name in error messages for dylibs from TBDs

[int3]

Summary

Since multiple dylibs can be defined in one TBD, this is
necessary to avoid confusion.

[oontvoo]

lld/MachO/InputFiles.cpp

709

why does this need to move?

[oontvoo]

lld/MachO/InputFiles.cpp

709

Oh, never mind - because toString() needs it.

Maybe you could move the other two fields too? (just in case something else comes up)

[int3]

move up initialization of all fields

lld/MachO/InputFiles.cpp

 using namespace llvm::sys;
 using namespace lld;
 using namespace lld::macho;
 
 // Returns "<internal>", "foo.a(bar.o)", or "baz.o".
 std::string lld::toString(const InputFile *f) {
   if (!f)
     return "<internal>";
+
+  // Multiple dylibs can be defined in one .tbd file.
+  if (auto dylibFile = dyn_cast<DylibFile>(f))
+    if (f->getName().endswith(".tbd"))
+      return (f->getName() + "(" + dylibFile->dylibName + ")").str();
+
   if (f->archiveName.empty())
     return std::string(f->getName());
   return (path::filename(f->archiveName) + "(" + path::filename(f->getName()) +
           ")")
       .str();
 }
 
 SetVector<InputFile *> macho::inputFiles;

 DylibFile::DylibFile(const InterfaceFile &interface, DylibFile *umbrella,
                      bool isBundleLoader)
     : InputFile(DylibKind, interface), refState(RefState::Unreferenced),
       isBundleLoader(isBundleLoader) {
   // FIXME: Add test for the missing TBD code path.
 
   if (umbrella == nullptr)
     umbrella = this;
+  dylibName = saver.save(interface.getInstallName());
 
   if (!is_contained(interface.targets(), config->target)) {
     error(toString(this) + " is incompatible with " +
           std::string(config->target));
     return;
   }
 
-  dylibName = saver.save(interface.getInstallName());
   compatibilityVersion = interface.getCompatibilityVersion().rawValue();
   currentVersion = interface.getCurrentVersion().rawValue();
   DylibFile *exportingFile = isImplicitlyLinked(dylibName) ? this : umbrella;
   auto addSymbol = [&](const Twine &name) -> void {
     symbols.push_back(symtab->addDylib(saver.save(name), exportingFile,
                                        /*isWeakDef=*/false,
                                        /*isTlv=*/false));
   };

lld/test/MachO/invalid/incompatible-target-tapi.test

 REQUIRES: x86, aarch64
 RUN: rm -rf %t; mkdir -p %t
 RUN: echo "" | llvm-mc -filetype=obj -triple=x86_64-apple-macosx -o %t/x86_64-test.o
 RUN: echo "" | llvm-mc -filetype=obj -triple=arm64-apple-iossimulator -o %t/arm64-test.o
 RUN: not %lld -dylib -arch x86_64 %S/Inputs/libincompatible.tbd %t/x86_64-test.o \
 RUN:   -o /dev/null 2>&1 | FileCheck %s --check-prefix=ARCH
 RUN: not %lld -dylib -arch arm64 -platform_version ios-simulator 14.0 15.0 %t/arm64-test.o \
 RUN:   %S/Inputs/libincompatible.tbd -o /dev/null 2>&1 | FileCheck %s --check-prefix=PLATFORM
-ARCH:     error: {{.*}}libincompatible.tbd is incompatible with x86_64 (macOS)
-PLATFORM: error: {{.*}}libincompatible.tbd is incompatible with arm64 (iOS Simulator)
+ARCH:     error: {{.*}}libincompatible.tbd(/usr/lib/libincompatible.dylib) is incompatible with x86_64 (macOS)
+PLATFORM: error: {{.*}}libincompatible.tbd(/usr/lib/libincompatible.dylib) is incompatible with arm64 (iOS Simulator)