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src/LiquidCode.Tester.Worker/Services/CppCompilationServiceIsolate.cs

@@ -1,4 +1,6 @@
+using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using LiquidCode.Tester.Worker.Services.Isolate;
 using LiquidCode.Tester.Worker.Models;
@@ -85,19 +87,66 @@ public class CppCompilationServiceIsolate : ICompilationService
 
             File.Copy(sourceFilePath, boxSourcePath, overwrite: true);
 
+            // Copy common headers from the source directory (e.g., testlib.h)
+            var sourceDirectory = Path.GetDirectoryName(sourceFilePath);
+            if (!string.IsNullOrEmpty(sourceDirectory) && Directory.Exists(sourceDirectory))
+            {
+                foreach (var header in Directory.EnumerateFiles(sourceDirectory))
+                {
+                    if (string.Equals(header, sourceFilePath, StringComparison.OrdinalIgnoreCase))
+                    {
+                        continue;
+                    }
+
+                    var extension = Path.GetExtension(header);
+                    if (extension is ".h" or ".hpp" or ".hh" or ".hxx" or ".h++" or ".inl" or ".tcc" )
+                    {
+                        var destination = Path.Combine(boxDir, Path.GetFileName(header));
+                        File.Copy(header, destination, overwrite: true);
+                    }
+                }
+            }
+
             // Resolve compiler and flags
             var (compiler, compilerFlags) = ResolveVersion(version);
             _logger.LogDebug("Using compiler: {Compiler} with flags: {Flags}", compiler, string.Join(' ', compilerFlags));
 
             // Build compiler arguments
             var arguments = new List<string>(compilerFlags);
+            var directoryBindings = new List<DirectoryBinding>
+            {
+                new DirectoryBinding { HostPath = "/usr/include", SandboxPath = "/usr/include", ReadOnly = true },
+                new DirectoryBinding { HostPath = "/usr/lib", SandboxPath = "/usr/lib", ReadOnly = true },
+                new DirectoryBinding { HostPath = "/lib", SandboxPath = "/lib", ReadOnly = true }
+            };
 
             // Add include directories
             if (includeDirectories != null)
             {
                 foreach (var includeDir in includeDirectories.Where(d => !string.IsNullOrWhiteSpace(d)))
                 {
-                    arguments.Add($"-I{includeDir}");
+                    var resolvedIncludeDir = includeDir;
+
+                    if (!Path.IsPathRooted(resolvedIncludeDir))
+                    {
+                        var baseDir = sourceDirectory ?? Directory.GetCurrentDirectory();
+                        resolvedIncludeDir = Path.GetFullPath(Path.Combine(baseDir, includeDir));
+                    }
+
+                    if (Directory.Exists(resolvedIncludeDir))
+                    {
+                        arguments.Add($"-I{resolvedIncludeDir}");
+                        directoryBindings.Add(new DirectoryBinding
+                        {
+                            HostPath = resolvedIncludeDir,
+                            SandboxPath = resolvedIncludeDir,
+                            ReadOnly = true
+                        });
+                    }
+                    else
+                    {
+                        arguments.Add($"-I{includeDir}");
+                    }
                 }
             }
 
@@ -133,12 +182,7 @@ public class CppCompilationServiceIsolate : ICompilationService
                 EnableNetwork = false,
                 StderrFile = stderrFilePath,
                 WorkingDirectory = "/box",
-                DirectoryBindings = new List<DirectoryBinding>
-                {
-                    new DirectoryBinding { HostPath = "/usr/include", SandboxPath = "/usr/include", ReadOnly = true },
-                    new DirectoryBinding { HostPath = "/usr/lib", SandboxPath = "/usr/lib", ReadOnly = true },
-                    new DirectoryBinding { HostPath = "/lib", SandboxPath = "/lib", ReadOnly = true }
-                }
+                DirectoryBindings = directoryBindings
             });
 
             // Read compiler output