Misc advancements towards compiling C++

bootstrap/Compilation.zig

@@ -166,7 +166,12 @@ const MuslContext = struct {
     }
 };
 
-pub fn compileCSourceFile(context: *const Context, arguments: [][*:0]u8) !void {
+const CSourceKind = enum{
+    c,
+    cpp,
+};
+
+pub fn compileCSourceFile(context: *const Context, arguments: [][*:0]u8, kind: CSourceKind) !void {
     const musl = try MuslContext.init(context);
     var exists = true;
     var dir = std.fs.cwd().openDir(musl.global_cache_dir, .{}) catch b: {
@@ -258,8 +263,10 @@ pub fn compileCSourceFile(context: *const Context, arguments: [][*:0]u8) !void {
     var clang_args = UnpinnedArray([]const u8){};
     try clang_args.append(context.my_allocator, context.executable_absolute_path);
     try clang_args.append(context.my_allocator, "clang");
+
+    if (kind == .c or kind == .cpp) {
         try clang_args.append(context.my_allocator, "-nostdinc");
-    // TODO: fix
+
         switch (@import("builtin").os.tag) {
             .linux => {
                 try clang_args.append_slice(context.my_allocator, &.{ "-isystem", "/home/david/dev/zig/lib/include", "-isystem", "/home/david/dev/zig/lib/libc/include/x86_64-linux-gnu", "-isystem", "/home/david/dev/zig/lib/libc/include/generic-glibc", "-isystem", "/home/david/dev/zig/lib/libc/include/x86-linux-any", "-isystem", "/home/david/dev/zig/lib/libc/include/any-linux-any" });
@@ -275,7 +282,23 @@ pub fn compileCSourceFile(context: *const Context, arguments: [][*:0]u8) !void {
                     "-isystem",    "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include",
                 });
             },
-        else => @compileError("Foo"),
+            else => @compileError("Operating system not supported"),
+        }
+    }
+
+    if (kind == .cpp) {
+        try clang_args.append(context.my_allocator, "-nostdinc++");
+        switch (@import("builtin").os.tag) {
+            .linux => {
+            },
+            .macos => {
+                try clang_args.append_slice(context.my_allocator, &.{
+                    "-isystem", try context.pathFromCompiler("lib/libcxx/include"),
+                    "-isystem", try context.pathFromCompiler("lib/libcxxabi/include"),
+                });
+            },
+            else => @compileError("Operating system not supported"),
+        }
     }
 
     for (arguments) |arg| {
@@ -15076,7 +15099,7 @@ pub const Unit = struct {
                 var stack_protector = "-fno-stack-protector".*;
 
                 var arguments = [_][*:0]u8{ &c_flag, c_source_file, &o_flag, basename_z, &g_flag, &stack_protector };
-                try compileCSourceFile(context, &arguments);
+                try compileCSourceFile(context, &arguments, .c);
                 unit.object_files.append_with_capacity(basename_z);
             }
 

bootstrap/main.zig

@@ -69,11 +69,9 @@ pub fn entry_point(arguments: [][*:0]u8) !void {
         // const exit_code = try clangMain(allocator, arguments);
         // std.process.exit(exit_code);
     } else if (byte_equal(command, "cc")) {
-        // TODO: transform our arguments to Clang and invoke it
-        try Compilation.compileCSourceFile(context, command_arguments);
+        try Compilation.compileCSourceFile(context, command_arguments, .c);
     } else if (byte_equal(command, "c++")) {
-        // TODO: transform our arguments to Clang and invoke it
-        todo();
+        try Compilation.compileCSourceFile(context, command_arguments, .cpp);
     } else if (byte_equal(command, "exe")) {
         try Compilation.buildExecutable(context, command_arguments, .{
             .is_test = false,

test/cc/cpp_first/.gitignore

@@ -0,0 +1,3 @@
+main
+*.o
+build

test/cc/cpp_first/CMakeLists.txt

@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.15)
+project(cpp_first CXX)
+add_executable(cpp_first main.cpp)

test/cc/cpp_first/main.cpp

@@ -0,0 +1,7 @@
+#include <iostream>
+
+int main()
+{
+    std::cout << "Hello world\n";
+    return 0;
+}