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diff --git a/src/cmd/cgo/doc.go b/src/cmd/cgo/doc.go
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-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-/*
-
-Cgo enables the creation of Go packages that call C code.
-
-Usage: cgo [compiler options] file.go
-
-The compiler options are passed through uninterpreted when
-invoking gcc to compile the C parts of the package.
-
-The input file.go is a syntactically valid Go source file that imports
-the pseudo-package "C" and then refers to types such as C.size_t,
-variables such as C.stdout, or functions such as C.putchar.
-
-If the import of "C" is immediately preceded by a comment, that
-comment is used as a header when compiling the C parts of
-the package.  For example:
-
-	// #include <stdio.h>
-	// #include <errno.h>
-	import "C"
-
-CFLAGS and LDFLAGS may be defined with pseudo #cgo directives
-within these comments to tweak the behavior of gcc.  Values defined
-in multiple directives are concatenated together.  Options prefixed
-by $GOOS, $GOARCH, or $GOOS/$GOARCH are only defined in matching
-systems.  For example:
-
-	// #cgo CFLAGS: -DPNG_DEBUG=1
-	// #cgo linux CFLAGS: -DLINUX=1
-	// #cgo LDFLAGS: -lpng
-	// #include <png.h>
-	import "C"
-
-Alternatively, CFLAGS and LDFLAGS may be obtained via the pkg-config
-tool using a '#cgo pkg-config:' directive followed by the package names.
-For example:
-
-	// #cgo pkg-config: png cairo
-	// #include <png.h>
-	import "C"
-
-Within the Go file, C identifiers or field names that are keywords in Go
-can be accessed by prefixing them with an underscore: if x points at a C
-struct with a field named "type", x._type accesses the field.
-
-The standard C numeric types are available under the names
-C.char, C.schar (signed char), C.uchar (unsigned char),
-C.short, C.ushort (unsigned short), C.int, C.uint (unsigned int),
-C.long, C.ulong (unsigned long), C.longlong (long long),
-C.ulonglong (unsigned long long), C.float, C.double.
-
-To access a struct, union, or enum type directly, prefix it with
-struct_, union_, or enum_, as in C.struct_stat.
-
-Any C function that returns a value may be called in a multiple
-assignment context to retrieve both the return value and the
-C errno variable as an os.Error.  For example:
-
-	n, err := C.atoi("abc")
-
-In C, a function argument written as a fixed size array
-actually requires a pointer to the first element of the array.
-C compilers are aware of this calling convention and adjust
-the call accordingly, but Go cannot.  In Go, you must pass
-the pointer to the first element explicitly: C.f(&x[0]).
-
-Cgo transforms the input file into four output files: two Go source
-files, a C file for 6c (or 8c or 5c), and a C file for gcc.
-
-The standard package makefile rules in Make.pkg automate the
-process of using cgo.  See $GOROOT/misc/cgo/stdio and
-$GOROOT/misc/cgo/gmp for examples.
-
-Cgo does not yet work with gccgo.
-*/
-package documentation