[clang-repl] Fix the process return code if diagnostics occurred. (#89879)

Should fix the failure seen in the pre-merge infrastructure of #89804.

Author: vgvassilev

clang/test/Interpreter/fail.cpp

@@ -1,12 +1,19 @@
-// FIXME: There're some inconsistencies between interactive and non-interactive
-// modes. For example, when clang-repl runs in the interactive mode, issues an
-// error, and then successfully recovers if we decide it's a success then for
-// the non-interactive mode the exit code should be a failure.
-// RUN: clang-repl "int x = 10;" "int y=7; err;" "int y = 10;"
 // REQUIRES: host-supports-jit
 // UNSUPPORTED: system-aix
-// RUN: cat %s | not clang-repl | FileCheck %s
-BOOM!
+// clang-repl can be called from the prompt in non-interactive mode as a
+// calculator in shell scripts, for example. In that case if there is an error
+// we should set the exit code as failure.
+// RUN: not clang-repl "int x = 10;" "int y=7; err;" "int y = 10;"
+
+// In interactive (REPL) mode, we can have errors but we should exit with
+// success because errors in the input code are part of the interactive use.
+// RUN: cat %s | clang-repl | FileCheck %s
+
+// However, interactive mode should fail when we specified -verify and there
+// was a diagnostic mismatches. This will make the testsuite fail as intended.
+// RUN: cat %s | not clang-repl -Xcc -Xclang -Xcc -verify | FileCheck %s
+
+BOOM! // expected-error {{intended to fail the -verify test}}
 extern "C" int printf(const char *, ...);
 int i = 42;
 auto r1 = printf("i = %d\n", i);

clang/tools/clang-repl/ClangRepl.cpp

@@ -215,13 +215,15 @@ int main(int argc, const char **argv) {
   } else
     Interp = ExitOnErr(clang::Interpreter::create(std::move(CI)));
 
+  bool HasError = false;
+
   for (const std::string &input : OptInputs) {
-    if (auto Err = Interp->ParseAndExecute(input))
+    if (auto Err = Interp->ParseAndExecute(input)) {
       llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
+      HasError = true;
+    }
   }
 
-  bool HasError = false;
-
   if (OptInputs.empty()) {
     llvm::LineEditor LE("clang-repl");
     std::string Input;
@@ -241,18 +243,13 @@ int main(int argc, const char **argv) {
         break;
       }
       if (Input == R"(%undo)") {
-        if (auto Err = Interp->Undo()) {
+        if (auto Err = Interp->Undo())
           llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
-          HasError = true;
-        }
       } else if (Input.rfind("%lib ", 0) == 0) {
-        if (auto Err = Interp->LoadDynamicLibrary(Input.data() + 5)) {
+        if (auto Err = Interp->LoadDynamicLibrary(Input.data() + 5))
           llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
-          HasError = true;
-        }
       } else if (auto Err = Interp->ParseAndExecute(Input)) {
         llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
-        HasError = true;
       }
 
       Input = "";