1# Test go build -pgo flag.
2# Specifically, the build cache handles profile content correctly.
3
4[short] skip 'compiles and links executables'
5
6# Set up fresh GOCACHE.
7env GOCACHE=$WORK/gocache
8mkdir $GOCACHE
9
10# build without PGO
11go build triv.go
12
13# build with PGO, should trigger rebuild
14# starting with an empty profile (the compiler accepts it)
15go build -x -pgo=prof -o triv.exe triv.go
16stderr 'preprofile.*-i.*prof'
17stderr 'compile.*-pgoprofile=.*triv.go'
18
19# check that PGO appears in build info
20# N.B. we can't start the stdout check with -pgo because the script assumes that
21# if the first arg starts with - it is a grep flag.
22go version -m triv.exe
23stdout 'build\s+-pgo=.*'${/}'prof'
24
25# store the build ID
26go list -export -json=BuildID -pgo=prof triv.go
27stdout '"BuildID":' # check that output actually contains a build ID
28cp stdout list.out
29
30# build again with the same profile, should be cached
31go build -x -pgo=prof -o triv.exe triv.go
32! stderr 'compile.*triv.go'
33
34# check that the build ID is the same
35go list -export -json=BuildID -pgo=prof triv.go
36cmp stdout list.out
37
38# overwrite the prof
39go run overwrite.go
40
41# build again, profile content changed, should trigger rebuild, including std
42go build -n -pgo=prof triv.go
43stderr 'preprofile.*-i.*prof'
44stderr 'compile.*-pgoprofile=.*triv.go'
45stderr 'compile.*-p runtime.*-pgoprofile=.*'
46
47# check that the build ID is different
48go list -export -json=BuildID -pgo=prof triv.go
49! cmp stdout list.out
50
51# build with trimpath, buildinfo path should be trimmed
52go build -x -pgo=prof -trimpath -o triv.exe triv.go
53
54# check that path is trimmed
55go version -m triv.exe
56stdout 'build\s+-pgo=prof'
57
58-- prof --
59-- triv.go --
60package main
61func main() {}
62-- overwrite.go --
63package main
64
65import (
66 "os"
67 "runtime/pprof"
68 "time"
69)
70
71func main() {
72 f, err := os.Create("prof")
73 if err != nil {
74 panic(err)
75 }
76 err = pprof.StartCPUProfile(f)
77 if err != nil {
78 panic(err)
79 }
80 // Spin to ensure we get some samples. If we get no samples, the result
81 // is equivalent to an empty profile.
82 start := time.Now()
83 for time.Since(start) < 100*time.Millisecond {}
84 pprof.StopCPUProfile()
85 f.Close()
86}
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