a full C parser and type checker that was also aware of any extensions
known to the system compiler (for example, all the GNU C extensions) as
well as the system-specific header locations and system-specific
pre-#defined macros. This is certainly possible to do, but it is an
enormous amount of work.

Cgo takes a different approach. It determines the meaning of C
identifiers not by parsing C code but by feeding carefully constructed

		includes:        append([]string{filepath.Dir(name)}, flags.I...),
		beginningOfLine: true,
		macros:          predefine(flags.D),
	}
}

// predefine installs the macros set by the -D flag on the command line.
func predefine(defines flags.MultiFlag) map[string]*Macro {
	macros := make(map[string]*Macro)
	for _, name := range defines {
		value := "1"
		i := strings.IndexRune(name, '=')
		if i > 0 {

pkg go/ast, method (CommentMap) Filter(Node) CommentMap
pkg go/ast, method (CommentMap) String() string
pkg go/ast, method (CommentMap) Update(Node, Node) Node
pkg go/ast, type ChanType struct, Arrow token.Pos
pkg go/ast, type CommentMap map[Node][]*CommentGroup
pkg go/build, const AllowBinary = 2
pkg go/build, const FindOnly = 1
pkg go/build, type Context struct, InstallSuffix string

	buf, err := bio.Create(*flags.OutputFile)
	if err != nil {
		log.Fatal(err)
	}
	defer buf.Close()

	if !*flags.SymABIs {
		buf.WriteString(objabi.HeaderString())
		fmt.Fprintf(buf, "!\n")
	}

	// Set macros for GOEXPERIMENTs so we can easily switch
	// runtime assembly code based on them.
	if objabi.LookupPkgSpecial(ctxt.Pkgpath).AllowAsmABI {
		for _, exp := range buildcfg.Experiment.Enabled() {

pkg go/ast, type SelectorExpr struct
pkg go/ast, type SelectorExpr struct, Sel *Ident
pkg go/ast, type SelectorExpr struct, X Expr
pkg go/ast, type SendStmt struct
pkg go/ast, type SendStmt struct, Arrow token.Pos
pkg go/ast, type SendStmt struct, Chan Expr
pkg go/ast, type SendStmt struct, Value Expr
pkg go/ast, type SliceExpr struct
pkg go/ast, type SliceExpr struct, High Expr