cmd/go: shorten longest 5 tests

Running go test -parallel=1 -v, these are the top 10 tests:

PASS: TestScript/mod_invalid_version 40.14s
PASS: TestScript/build_cache_output 46.82s
PASS: TestScript/get_legacy 48.69s
PASS: TestTestCache 58.44s
PASS: TestScript/mod_get_direct 62.88s
PASS: TestScript/build_pgo_auto_multi 63.49s
PASS: TestScript/build_pgo_auto 70.69s
PASS: TestScript/gcflags_patterns 95.17s
PASS: TestScript/mod_list_compiled_concurrent 124.31s
PASS: TestScript/vet_flags 202.85s

Change the top 5 not to run builds at all, so they don't
have to use -a or clear the go build cache.

mod_get_direct should be replaced with a vcs-test test.
mod_invalid_version should be replaced with a vcs-test test.
get_legacy should be deleted eventually.

Change-Id: Id67c458b1a96c912d89cbece341372c2ef5ee082
Reviewed-on: https://go-review.googlesource.com/c/go/+/504536
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/cmd/go/testdata/script/build_pgo_auto.txt

@@ -3,7 +3,7 @@
 [short] skip 'compiles and links executables'
 
 # use default.pgo for a single main package
-go build -a -x -pgo=auto -o a1.exe ./a/a1
+go build -n -pgo=auto -o a1.exe ./a/a1
 stderr 'compile.*-pgoprofile=.*default\.pgo.*a1.go'
 
 # check that pgo applied to dependencies
@@ -12,25 +12,22 @@ stderr 'compile.*-p test/dep.*-pgoprofile=.*default\.pgo'
 # check that pgo appears in build info
 # N.B. we can't start the stdout check with -pgo because the script assumes that
 # if the first arg starts with - it is a grep flag.
-go version -m a1.exe
+stderr 'build\\t-pgo=.*default\.pgo'
-stdout 'build\s+-pgo=.*default\.pgo'
 
 # use default.pgo for ... with a single main package
-go build -a -x -pgo=auto ./a/...
+go build -n -pgo=auto ./a/...
 stderr 'compile.*-pgoprofile=.*default\.pgo.*a1.go'
 
 # check that pgo appears in build info
-go version -m a1$GOEXE
+stderr 'build\\t-pgo=.*default\.pgo'
-stdout 'build\s+-pgo=.*default\.pgo'
 
 # build succeeds without PGO when default.pgo file is absent
-go build -a -x -pgo=auto -o nopgo.exe ./nopgo
+go build -n -pgo=auto -o nopgo.exe ./nopgo
 stderr 'compile.*nopgo.go'
 ! stderr 'compile.*-pgoprofile'
 
 # check that pgo doesn't appear in build info
-go version -m nopgo.exe
+! stderr 'build\\t-pgo='
-! stdout 'build\s+-pgo='
 
 # other build-related commands
 go install -a -n -pgo=auto ./a/a1
@@ -52,30 +49,27 @@ go list -deps -pgo=auto ./a/a1
 
 # -pgo=auto is the default. Commands without explicit -pgo=auto
 # should work as -pgo=auto.
-go build -a -x -o a1.exe ./a/a1
+go build -a -n -o a1.exe ./a/a1
 stderr 'compile.*-pgoprofile=.*default\.pgo.*a1.go'
 stderr 'compile.*-p test/dep.*-pgoprofile=.*default\.pgo'
 
 # check that pgo appears in build info
-go version -m a1.exe
+stderr 'build\\t-pgo=.*default\.pgo'
-stdout 'build\s+-pgo=.*default\.pgo'
 
-go build -a -x -o nopgo.exe ./nopgo
+go build -a -n -o nopgo.exe ./nopgo
 stderr 'compile.*nopgo.go'
 ! stderr 'compile.*-pgoprofile'
 
 # check that pgo doesn't appear in build info
-go version -m nopgo.exe
+! stderr 'build\\t-pgo='
-! stdout 'build\s+-pgo='
 
 # -pgo=off should turn off PGO.
-go build -a -x -pgo=off -o a1.exe ./a/a1
+go build -a -n -pgo=off -o a1.exe ./a/a1
 stderr 'compile.*a1.go'
 ! stderr 'compile.*-pgoprofile'
 
 # check that pgo doesn't appear in build info
-go version -m a1.exe
+! stderr 'build\\t-pgo='
-! stdout 'build\s+-pgo='
 
 -- go.mod --
 module test

src/cmd/go/testdata/script/build_pgo_auto_multi.txt

@@ -1,9 +1,6 @@
 # Test go build -pgo=auto flag with multiple main packages.
 
-[short] skip 'compiles and links executables'
+go install -a -n -pgo=auto ./a ./b ./nopgo
-
-env GOBIN=$WORK/bin
-go install -a -x -pgo=auto ./a ./b ./nopgo
 
 # a/default.pgo applies to package a and (transitive)
 # dependencies.
@@ -36,16 +33,9 @@ stderr -count=3 'compile.*dep3(/|\\\\)dep3.go'
 stderr -count=2 'compile.*-pgoprofile=.*dep3(/|\\\\)dep3\.go'
 
 # check that pgo appears or not in build info as expected
-# N.B. we can't start the stdout check with -pgo because the script assumes that
+stderr 'path\\ttest/a\\n.*build\\t-pgo=.*a(/|\\\\)default\.pgo'
-# if the first arg starts with - it is a grep flag.
+stderr 'path\\ttest/b\\n.*build\\t-pgo=.*b(/|\\\\)default\.pgo'
-go version -m $GOBIN/a$GOEXE
+! stderr 'path\\ttest/nopgo\\n.*build\\t-pgo='
-stdout 'build\s+-pgo=.*a'${/}'default\.pgo'
-
-go version -m $GOBIN/b$GOEXE
-stdout 'build\s+-pgo=.*b'${/}'default\.pgo'
-
-go version -m $GOBIN/nopgo$GOEXE
-! stdout 'build\s+-pgo='
 
 # go test works the same way
 go test -a -n -pgo=auto ./a ./b ./nopgo

src/cmd/go/testdata/script/gcflags_patterns.txt

@@ -3,17 +3,15 @@ env GO111MODULE=off
 [!compiler:gc] skip 'using -gcflags and -ldflags'
 [short] skip
 
-env GOCACHE=$WORK/gocache  # Looking for compile commands, so need a clean cache.
-
 # -gcflags=-e applies to named packages, not dependencies
-go build -n -v -gcflags=-e z1 z2
+go build -a -n -v -gcflags=-e z1 z2
 stderr 'compile.* -p z1.* -e '
 stderr 'compile.* -p z2.* -e '
 stderr 'compile.* -p y'
 ! stderr 'compile.* -p [^z].* -e '
 
 # -gcflags can specify package=flags, and can be repeated; last match wins
-go build -n -v -gcflags=-e -gcflags=z1=-N z1 z2
+go build -a -n -v -gcflags=-e -gcflags=z1=-N z1 z2
 stderr 'compile.* -p z1.* -N '
 ! stderr 'compile.* -p z1.* -e '
 ! stderr 'compile.* -p z2.* -N '
@@ -23,11 +21,11 @@ stderr 'compile.* -p y'
 ! stderr 'compile.* -p [^z].* -N '
 
 # -gcflags can have arbitrary spaces around the flags
-go build -n -v -gcflags='  z1 =  	-e 	' z1
+go build -a -n -v -gcflags='  z1 =  	-e 	' z1
 stderr 'compile.* -p z1.* -e '
 
 # -gcflags='all=-e' should apply to all packages, even with go test
-go test -c -n -gcflags='all=-e' z1
+go test -a -c -n -gcflags='all=-e' z1
 stderr 'compile.* -p z3.* -e '
 
 # this particular -gcflags argument made the compiler crash
@@ -39,31 +37,31 @@ stderr 'PhaseOptions usage'
 stderr 'invalid value'
 
 # -ldflags for implicit test package applies to test binary
-go test -c -n -gcflags=-N -ldflags=-X=x.y=z z1
+go test -a -c -n -gcflags=-N -ldflags=-X=x.y=z z1
 stderr 'compile.* -N .*z_test.go'
 stderr 'link.* -X=x.y=z'
 
 # -ldflags for explicit test package applies to test binary
-go test -c -n -gcflags=z1=-N -ldflags=z1=-X=x.y=z z1
+go test -a -c -n -gcflags=z1=-N -ldflags=z1=-X=x.y=z z1
 stderr 'compile.* -N .*z_test.go'
 stderr 'link.* -X=x.y=z'
 
 # -ldflags applies to link of command
-go build -n -ldflags=-X=math.pi=3 my/cmd/prog
+go build -a -n -ldflags=-X=math.pi=3 my/cmd/prog
 stderr 'link.* -X=math.pi=3'
 
 # -ldflags applies to link of command even with strange directory name
-go build -n -ldflags=-X=math.pi=3 my/cmd/prog/
+go build -a -n -ldflags=-X=math.pi=3 my/cmd/prog/
 stderr 'link.* -X=math.pi=3'
 
 # -ldflags applies to current directory
 cd my/cmd/prog
-go build -n -ldflags=-X=math.pi=3
+go build -a -n -ldflags=-X=math.pi=3
 stderr 'link.* -X=math.pi=3'
 
 # -ldflags applies to current directory even if GOPATH is funny
 [!case-sensitive] cd $WORK/GoPath/src/my/cmd/prog
-go build -n -ldflags=-X=math.pi=3
+go build -a -n -ldflags=-X=math.pi=3
 stderr 'link.* -X=math.pi=3'
 
 # cgo.a should not be a dependency of internally-linked go package

src/cmd/go/testdata/script/mod_list_compiled_concurrent.txt

@@ -5,33 +5,12 @@ env GO111MODULE=on
 
 # Regression test for golang.org/issue/29667:
 # spurious 'failed to cache compiled Go files' errors.
-# This test failed reliably when run with -count=10
-# on a Linux workstation.
 
 env GOCACHE=$WORK/gocache
 mkdir $GOCACHE
 
 go list -json -compiled -test=false -export=false -deps=true -- . &
 go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-go list -json -compiled -test=false -export=false -deps=true -- . &
-
 wait
 
 -- go.mod --

src/cmd/go/testdata/script/vet_flags.txt

@@ -52,27 +52,25 @@ env GOFLAGS='-unsafeptr'
 stderr 'go: parsing \$GOFLAGS: unknown flag -unsafeptr'
 env GOFLAGS=
 
-env GOCACHE=$WORK/gocache
-
 # "go test" on a user package should by default enable an explicit list of analyzers.
-go test -x -run=none .
+go test -n -run=none .
 stderr '[/\\]vet'$GOEXE'["]? .* -errorsas .* ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
 
 # An explicitly-empty -vet argument should imply the default analyzers.
-go test -x -vet= -run=none .
+go test -n -vet= -run=none .
 stderr '[/\\]vet'$GOEXE'["]? .* -errorsas .* ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
 
 # "go test" on a standard package should by default disable an explicit list.
-go test -x -run=none encoding/binary
+go test -n -run=none encoding/binary
 stderr '[/\\]vet'$GOEXE'["]? -unsafeptr=false -unreachable=false ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
 
-go test -x -vet= -run=none encoding/binary
+go test -n -vet= -run=none encoding/binary
 stderr '[/\\]vet'$GOEXE'["]? -unsafeptr=false -unreachable=false ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
 
 # Both should allow users to override via the -vet flag.
-go test -x -vet=unreachable -run=none .
+go test -n -vet=unreachable -run=none .
 stderr '[/\\]vet'$GOEXE'["]? -unreachable ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
-go test -x -vet=unreachable -run=none encoding/binary
+go test -n -vet=unreachable -run=none encoding/binary
 stderr '[/\\]vet'$GOEXE'["]? -unreachable ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
 
 -- go.mod --