ForceFunctionAttrs: Use reportFatalUsageError (#139473)

Author: arsenm

llvm/lib/Transforms/IPO/ForceFunctionAttrs.cpp

@@ -91,8 +91,12 @@ PreservedAnalyses ForceFunctionAttrsPass::run(Module &M,
   bool Changed = false;
   if (!CSVFilePath.empty()) {
     auto BufferOrError = MemoryBuffer::getFileOrSTDIN(CSVFilePath);
-    if (!BufferOrError)
-      report_fatal_error("Cannot open CSV file.");
+    if (!BufferOrError) {
+      std::error_code EC = BufferOrError.getError();
+      M.getContext().emitError("cannot open CSV file: " + EC.message());
+      return PreservedAnalyses::all();
+    }
+
     StringRef Buffer = BufferOrError.get()->getBuffer();
     auto MemoryBuffer = MemoryBuffer::getMemBuffer(Buffer);
     line_iterator It(*MemoryBuffer);

llvm/test/Transforms/ForcedFunctionAttrs/open-file-error.ll

@@ -0,0 +1,6 @@
+; RUN: not opt -disable-output -passes='forceattrs' -forceattrs-csv-path="%S/CannotOpenFile.csv"  %s 2>&1 | FileCheck -DMSG=%errc_ENOENT %s
+
+; CHECK: error: cannot open CSV file: [[MSG]]
+define void @first_function() {
+  ret void
+}