cmd/yacc: remove go tool yacc

It is no longer used by Go.

It's now moved to golang.org/x/tools/cmd/goyacc for anybody who needs it.

Fixes #11229

Change-Id: Ia431d5a380c7ff784a2050dee2f5bc8acee015da
Reviewed-on: https://go-review.googlesource.com/27325
Run-TryBot: Brad Fitzpatrick <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Matthew Dempsky <[email protected]>

Author: bradfitz

doc/articles/go_command.html

@@ -255,8 +255,7 @@ <h2>Limitations</h2>
 source files <em>during</em> a build, although it does provide
 <a href="/cmd/go/#hdr-Generate_Go_files_by_processing_source"><code>go</code>
 <code>generate</code></a>,
-which can automate the creation of Go files <em>before</em>
-the build, such as by running <code>yacc</code>.
+which can automate the creation of Go files <em>before</em> the build.
 For more advanced build setups, you may need to write a
 makefile (or a configuration file for the build tool of your choice)
 to run whatever tool creates the Go files and then check those generated source files

doc/go_faq.html

@@ -1670,8 +1670,7 @@ <h3 id="What_compiler_technology_is_used_to_build_the_compilers">
 
 <p>
 <code>Gccgo</code> has a front end written in C++, with a recursive descent parser coupled to the
-standard GCC back end. <code>Gc</code> is written in Go using
-<code>yacc</code>/<code>bison</code> for the parser
+standard GCC back end. <code>Gc</code> is written in Go with a recursive descent parser
 and uses a custom loader, also written in Go but
 based on the Plan 9 loader, to generate ELF/Mach-O/PE binaries.
 </p>

src/cmd/go/alldocs.go

@@ -367,7 +367,7 @@
 //
 // Generate runs commands described by directives within existing
 // files. Those commands can run any process but the intent is to
-// create or update Go source files, for instance by running yacc.
+// create or update Go source files.
 //
 // Go generate is never run automatically by go build, go get, go test,
 // and so on. It must be run explicitly.
@@ -430,10 +430,10 @@
 // can be used to create aliases or to handle multiword generators.
 // For example,
 //
-// 	//go:generate -command yacc go tool yacc
+// 	//go:generate -command foo go tool foo
 //
-// specifies that the command "yacc" represents the generator
-// "go tool yacc".
+// specifies that the command "foo" represents the generator
+// "go tool foo".
 //
 // Generate processes packages in the order given on the command line,
 // one at a time. If the command line lists .go files, they are treated

src/cmd/go/generate.go

@@ -25,7 +25,7 @@ var cmdGenerate = &Command{
 	Long: `
 Generate runs commands described by directives within existing
 files. Those commands can run any process but the intent is to
-create or update Go source files, for instance by running yacc.
+create or update Go source files.
 
 Go generate is never run automatically by go build, go get, go test,
 and so on. It must be run explicitly.
@@ -88,10 +88,10 @@ string xxx represents the command identified by the arguments. This
 can be used to create aliases or to handle multiword generators.
 For example,
 
-	//go:generate -command yacc go tool yacc
+	//go:generate -command foo go tool foo
 
-specifies that the command "yacc" represents the generator
-"go tool yacc".
+specifies that the command "foo" represents the generator
+"go tool foo".
 
 Generate processes packages in the order given on the command line,
 one at a time. If the command line lists .go files, they are treated

src/cmd/go/pkg.go

@@ -691,24 +691,23 @@ const (
 
 // goTools is a map of Go program import path to install target directory.
 var goTools = map[string]targetDir{
-	"cmd/addr2line":                        toTool,
-	"cmd/api":                              toTool,
-	"cmd/asm":                              toTool,
-	"cmd/compile":                          toTool,
-	"cmd/cgo":                              toTool,
-	"cmd/cover":                            toTool,
-	"cmd/dist":                             toTool,
-	"cmd/doc":                              toTool,
-	"cmd/fix":                              toTool,
-	"cmd/link":                             toTool,
-	"cmd/newlink":                          toTool,
-	"cmd/nm":                               toTool,
-	"cmd/objdump":                          toTool,
-	"cmd/pack":                             toTool,
-	"cmd/pprof":                            toTool,
-	"cmd/trace":                            toTool,
-	"cmd/vet":                              toTool,
-	"cmd/yacc":                             toTool,
+	"cmd/addr2line": toTool,
+	"cmd/api":       toTool,
+	"cmd/asm":       toTool,
+	"cmd/compile":   toTool,
+	"cmd/cgo":       toTool,
+	"cmd/cover":     toTool,
+	"cmd/dist":      toTool,
+	"cmd/doc":       toTool,
+	"cmd/fix":       toTool,
+	"cmd/link":      toTool,
+	"cmd/newlink":   toTool,
+	"cmd/nm":        toTool,
+	"cmd/objdump":   toTool,
+	"cmd/pack":      toTool,
+	"cmd/pprof":     toTool,
+	"cmd/trace":     toTool,
+	"cmd/vet":       toTool,
 	"code.google.com/p/go.tools/cmd/cover": stalePath,
 	"code.google.com/p/go.tools/cmd/godoc": stalePath,
 	"code.google.com/p/go.tools/cmd/vet":   stalePath,