Clean up linux includes setup.

Includes setup was moved to ParserOptions.cs and is used just like `SetupMSVC()` and `SetupXcode()`. Native compiler is queried for it's type and version. Correct include paths are set up in cases where system has multiple compilers installed as well.

src/CLI/Generator.cs

@@ -4,9 +4,11 @@ using CppSharp.Parser;
 using CppSharp.Passes;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using CppAbi = CppSharp.Parser.AST.CppAbi;
 
 namespace CppSharp
@@ -193,34 +195,7 @@ namespace CppSharp
 
         private void SetupLinuxOptions(ParserOptions parserOptions)
         {
-            parserOptions.MicrosoftMode = false;
-            parserOptions.NoBuiltinIncludes = true;
-
-            var headersPath = string.Empty;
-
-            // Search for the available GCC versions on the provided headers.
-            var versions = Directory.EnumerateDirectories(Path.Combine(headersPath, "usr/include/c++"));
-
-            if (versions.Count() == 0)
-                throw new Exception("No valid GCC version found on system include paths");
-
-            string gccVersionPath = versions.First();
-            string gccVersion = gccVersionPath.Substring(gccVersionPath.LastIndexOf(Path.DirectorySeparatorChar) + 1);
-
-            string[] systemIncludeDirs = {
-                Path.Combine("usr", "include", "c++", gccVersion),
-                Path.Combine("usr", "include", "x86_64-linux-gnu", "c++", gccVersion),
-                Path.Combine("usr", "include", "c++", gccVersion, "backward"),
-                Path.Combine("usr", "lib", "gcc", "x86_64-linux-gnu", gccVersion, "include"),
-                Path.Combine("usr", "lib", "gcc", "x86_64-pc-linux-gnu", gccVersion, "include"),
-                Path.Combine("usr", "include", "x86_64-linux-gnu"),
-                Path.Combine("usr", "include", "x86_64-pc-linux-gnu"),
-                Path.Combine("usr", "include")
-            };
-
-            foreach (var dir in systemIncludeDirs)
-                parserOptions.AddSystemIncludeDirs(Path.Combine(headersPath, dir));
-
+            parserOptions.SetupLinux();
             parserOptions.AddDefines("_GLIBCXX_USE_CXX11_ABI=" + (options.Cpp11ABI ? "1" : "0"));
         }
 

src/CppParser/ParserGen/ParserGen.cs

@@ -98,32 +98,7 @@ namespace CppSharp
 
             var headersPath = Platform.IsLinux ? string.Empty :
                 Path.Combine(GetSourceDirectory("build"), "headers", "x86_64-linux-gnu");
-
-            // Search for the available GCC versions on the provided headers.
-            var versions = Directory.EnumerateDirectories(Path.Combine(headersPath,
-                "usr/include/c++"));
-
-            if (versions.Count() == 0)
-                throw new Exception("No valid GCC version found on system include paths");
-
-            string gccVersionPath = versions.First();
-            string gccVersion = gccVersionPath.Substring(
-                gccVersionPath.LastIndexOf(Path.DirectorySeparatorChar) + 1);
-
-            string[] systemIncludeDirs = {
-                Path.Combine("usr", "include", "c++", gccVersion),
-                Path.Combine("usr", "include", "x86_64-linux-gnu", "c++", gccVersion),
-                Path.Combine("usr", "include", "c++", gccVersion, "backward"),
-                Path.Combine("usr", "lib", "gcc", "x86_64-linux-gnu", gccVersion, "include"),
-                Path.Combine("usr", "lib", "gcc", "x86_64-pc-linux-gnu", gccVersion, "include"),
-                Path.Combine("usr", "include", "x86_64-linux-gnu"),
-                Path.Combine("usr", "include", "x86_64-pc-linux-gnu"),
-                Path.Combine("usr", "include")
-            };
-
-            foreach (var dir in systemIncludeDirs)
-                options.AddSystemIncludeDirs(Path.Combine(headersPath, dir));
-
+            options.SetupLinux(headersPath);
             options.AddDefines("_GLIBCXX_USE_CXX11_ABI=" + (IsGnuCpp11Abi ? "1" : "0"));
         }
 
@@ -237,4 +212,4 @@ namespace CppSharp
             }
         }
     }
-}
+}

src/Parser/ParserOptions.cs

@@ -1,9 +1,12 @@
-using CppSharp.Parser.AST;
+using System;
+using CppSharp.Parser.AST;
 using System.Reflection;
 using LanguageVersion = CppSharp.Parser.LanguageVersion;
 using System.Globalization;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
+using System.Text.RegularExpressions;
 
 namespace CppSharp.Parser
 {
@@ -218,6 +221,53 @@ namespace CppSharp.Parser
             AddArguments("-stdlib=libc++");
         }
 
+        private void GetUnixCompilerInfo(out string compiler, out string version)
+        {
+            var info = new ProcessStartInfo(Environment.GetEnvironmentVariable("CXX") ?? "gcc", "-v");
+            info.RedirectStandardError = true;
+            info.CreateNoWindow = true;
+            info.UseShellExecute = false;
+            var process = Process.Start(info);
+            if (process == null)
+                throw new SystemException("GCC compiler was not found.");
+            process.WaitForExit();
+
+            var output = process.StandardError.ReadToEnd();
+            var match = Regex.Match(output, "(gcc|clang) version ([0-9\\.]+)");
+            if (!match.Success)
+                throw new SystemException("GCC compiler was not found.");
+
+            compiler = match.Groups[1].ToString();
+            version = match.Groups[2].ToString();
+        }
+
+        public void SetupLinux(string headersPath="")
+        {
+            MicrosoftMode = false;
+            NoBuiltinIncludes = true;
+            NoStandardIncludes = true;
+            Abi = CppAbi.Itanium;
+
+            string compiler, version;
+            GetUnixCompilerInfo(out compiler, out version);
+            Console.WriteLine($"Compiler version: {compiler}/{version}");
+            AddSystemIncludeDirs($"{headersPath}/usr/include");
+            if (compiler == "gcc")
+            {
+                AddSystemIncludeDirs($"{headersPath}/usr/include/c++/{version}");
+                AddSystemIncludeDirs($"{headersPath}/usr/include/x86_64-linux-gnu/c++/{version}");
+                AddSystemIncludeDirs($"{headersPath}/usr/include/c++/{version}/backward");
+            }
+            string[] tripples = {"x86_64-linux-gnu", "x86_64-pc-linux-gnu"};
+            foreach (var tripple in tripples)
+            {
+                AddSystemIncludeDirs($"{headersPath}/usr/lib/{compiler}/{tripple}/{version}/include");
+                AddSystemIncludeDirs($"{headersPath}/usr/lib/{compiler}/{tripple}/{version}/include/c++");
+                AddSystemIncludeDirs($"{headersPath}/usr/lib/{compiler}/{tripple}/{version}/include/c++/{tripple}");
+                AddSystemIncludeDirs($"{headersPath}/usr/include/{tripple}");
+            }
+        }
+
         public void Setup()
         {
             SetupArguments();
@@ -291,6 +341,9 @@ namespace CppSharp.Parser
                 case TargetPlatform.MacOS:
                     SetupXcode();
                     break;
+                case TargetPlatform.Linux:
+                    SetupLinux();
+                    break;
             }
         }
     }