From 78bfc751bdc7c7bbeeeb71fe94489c1971195a2f Mon Sep 17 00:00:00 2001
From: mcbarton <150042563+mcbarton@users.noreply.github.com>
Date: Wed, 12 Nov 2025 20:23:27 +0000
Subject: [PATCH] Revert "Fix missing C stderr output (fprintf(stderr, ...) not
 shown) (#402)"

This reverts commit 5860e959a9fb6ea170e124e5e16e0ed05bd95117.
---
 src/xinterpreter.cpp      | 45 +++++++++++++--------------------------
 test/test_interpreter.cpp | 42 ------------------------------------
 2 files changed, 15 insertions(+), 72 deletions(-)

diff --git a/src/xinterpreter.cpp b/src/xinterpreter.cpp
index 15d6861b..14972324 100644
--- a/src/xinterpreter.cpp
+++ b/src/xinterpreter.cpp
@@ -56,22 +56,16 @@ using namespace std::placeholders;
 namespace xcpp
 {
     struct StreamRedirectRAII {
-        std::string& out;
-        std::string& err;
-
-        StreamRedirectRAII(std::string& o, std::string& e)
-            : out(o)
-            , err(e)
-        {
-            Cpp::BeginStdStreamCapture(Cpp::kStdOut);
-            Cpp::BeginStdStreamCapture(Cpp::kStdErr);
-        }
-
-        ~StreamRedirectRAII()
-        {
-            err = Cpp::EndStdStreamCapture();
-            out = Cpp::EndStdStreamCapture();
-        }
+      std::string &err;
+      StreamRedirectRAII(std::string &e) : err(e) {
+        Cpp::BeginStdStreamCapture(Cpp::kStdErr);
+        Cpp::BeginStdStreamCapture(Cpp::kStdOut);
+      }
+      ~StreamRedirectRAII() {
+        std::string out = Cpp::EndStdStreamCapture();
+        err = Cpp::EndStdStreamCapture();
+        std::cout << out;
+      }
     };
 
     void interpreter::configure_impl()
@@ -169,12 +163,11 @@ __get_cxx_version ()
         }
 
         std::string err;
-        std::string out;
 
         // Attempt normal evaluation
         try
         {
-            StreamRedirectRAII R(out, err);
+            StreamRedirectRAII R(err);
             compilation_result = Cpp::Process(code.c_str());
         }
         catch (std::exception& e)
@@ -189,12 +182,11 @@ __get_cxx_version ()
             ename = "Error: ";
         }
 
-        if (!out.empty())
-        {
-            std::cout << out;
-        }
-        if (!err.empty())
+        if (compilation_result)
         {
+            errorlevel = 1;
+            ename = "Error: ";
+            evalue = "Compilation error! " + err;
             std::cerr << err;
         }
 
@@ -209,13 +201,6 @@ __get_cxx_version ()
             std::cerr.rdbuf(cerr_strbuf);
         }
 
-        if (compilation_result)
-        {
-            errorlevel = 1;
-            ename = "Error: ";
-            evalue = "Compilation error! " + err;
-        }
-
         // Depending of error level, publish execution result or execution
         // error, and compose execute_reply message.
         if (errorlevel)
diff --git a/test/test_interpreter.cpp b/test/test_interpreter.cpp
index 5ce9d540..cfb0d7d5 100644
--- a/test/test_interpreter.cpp
+++ b/test/test_interpreter.cpp
@@ -1094,45 +1094,3 @@ TEST_SUITE("mime_bundle_repr")
         REQUIRE(res == expected);
     }
 }
-
-TEST_CASE("C and C++ stdout/stderr capture") 
-{
-    std::vector<const char*> Args = {};
-    xcpp::interpreter interpreter((int)Args.size(), Args.data());
-
-    xeus::execute_request_config config;
-    config.silent = false;
-    config.store_history = false;
-    config.allow_stdin = false;
-
-    nl::json header = nl::json::object();
-    xeus::xrequest_context::guid_list id = {};
-    xeus::xrequest_context context(header, id);
-
-    std::promise<nl::json> promise;
-    auto callback = [&promise](nl::json result) { promise.set_value(result); };
-
-    // Redirect std::cout and std::cerr
-    StreamRedirectRAII cout_redirect(std::cout);
-    StreamRedirectRAII cerr_redirect(std::cerr);
-
-    std::string code = R"(
-        #include <stdio.h>
-        #include <iostream>
-        printf("C stdout\n");
-        fprintf(stderr, "C stderr\n");
-        std::cout << "C++ stdout\n";
-        std::cerr << "C++ stderr\n";
-    )";
-
-    interpreter.execute_request(context, callback, code, config, nl::json::object());
-    (void)promise.get_future().get(); // wait for result
-
-    std::string captured_out = cout_redirect.getCaptured();
-    std::string captured_err = cerr_redirect.getCaptured();
-
-    REQUIRE(captured_out.find("C stdout") != std::string::npos);
-    REQUIRE(captured_out.find("C++ stdout") != std::string::npos);
-    REQUIRE(captured_err.find("C stderr") != std::string::npos);
-    REQUIRE(captured_err.find("C++ stderr") != std::string::npos);
-}