[LTO] Errors in LLVM backend should manifest as lld errors

[sbc100]

This change causes: test/ELF/lto/sample-profile.ll to fail with:

ld.lld: error: /dev/null: Could not open profile: Unrecognized sample profile encoding format

This seems like it really is an error so we should probably update the test but I'm not sure exactly what the intent of that particular test is.

[sbc100]

• fix elf test

[pcc]

LGTM

test/ELF/lto/sample-profile.ll

5 ↗

(On Diff #153751)

Remove this line.

Common/ErrorHandler.cpp

void lld::exitLld(int Val) {
   _exit(Val);
 }
 
 void lld::diagnosticHandler(const DiagnosticInfo &DI) {
   SmallString<128> S;
   raw_svector_ostream OS(S);
   DiagnosticPrinterRawOStream DP(OS);
   DI.print(DP);
+  switch (DI.getSeverity()) {
+    case DS_Error:
+      error(S);
+      break;
+    case DS_Warning:
       warn(S);
+      break;
+    case DS_Remark:
+    case DS_Note:
+      message(S);
+      break;
+  }
 }
 
 void lld::checkError(Error E) {
   handleAllErrors(std::move(E),
                   [&](ErrorInfoBase &EIB) { error(EIB.message()); });
 }
 
 void ErrorHandler::print(StringRef S, raw_ostream::Colors C) {

test/wasm/lto/diagnostics.ll

+; verify that errors in the LLVM backend during LTO manifest as lld
+; errors
+
+; RUN: llvm-as %s -o %t.o
+; RUN: not wasm-ld --lto-O0 %t.o -o %t2 2>&1 | FileCheck %s
+
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown"
+
+define void @_start() {
+  call i8* @foo()
+  ret void
+}
+
+define i8* @foo() {
+  %1 = call i8* @llvm.returnaddress(i32 0)
+  ret i8* %1
+}
+
+declare i8* @llvm.returnaddress(i32)
+
+; CHECK: error: {{.*}} WebAssembly hasn't implemented __builtin_return_address