const DefaultCFlags = "-O2 -g"
AllowInstall returns a non-nil error if this invocation of the go command is allowed to install a.Target.
The build of cmd/go running under its own test is forbidden from installing to its original GOROOT. The var is exported so it can be set by TestMain.
var AllowInstall = func(*Action) error { return nil }
var BuildToolchain toolchain = noToolchain{}
var CmdBuild = &base.Command{ UsageLine: "go build [-o output] [build flags] [packages]", Short: "compile packages and dependencies", Long: ` Build compiles the packages named by the import paths, along with their dependencies, but it does not install the results. If the arguments to build are a list of .go files from a single directory, build treats them as a list of source files specifying a single package. When compiling packages, build ignores files that end in '_test.go'. When compiling a single main package, build writes the resulting executable to an output file named after the last non-major-version component of the package import path. The '.exe' suffix is added when writing a Windows executable. So 'go build example/sam' writes 'sam' or 'sam.exe'. 'go build example.com/foo/v2' writes 'foo' or 'foo.exe', not 'v2.exe'. When compiling a package from a list of .go files, the executable is named after the first source file. 'go build ed.go rx.go' writes 'ed' or 'ed.exe'. When compiling multiple packages or a single non-main package, build compiles the packages but discards the resulting object, serving only as a check that the packages can be built. The -o flag forces build to write the resulting executable or object to the named output file or directory, instead of the default behavior described in the last two paragraphs. If the named output is an existing directory or ends with a slash or backslash, then any resulting executables will be written to that directory. The build flags are shared by the build, clean, get, install, list, run, and test commands: -C dir Change to dir before running the command. Any files named on the command line are interpreted after changing directories. If used, this flag must be the first one in the command line. -a force rebuilding of packages that are already up-to-date. -n print the commands but do not run them. -p n the number of programs, such as build commands or test binaries, that can be run in parallel. The default is GOMAXPROCS, normally the number of CPUs available. -race enable data race detection. Supported only on linux/amd64, freebsd/amd64, darwin/amd64, darwin/arm64, windows/amd64, linux/ppc64le and linux/arm64 (only for 48-bit VMA). -msan enable interoperation with memory sanitizer. Supported only on linux/amd64, linux/arm64, linux/loong64, freebsd/amd64 and only with Clang/LLVM as the host C compiler. PIE build mode will be used on all platforms except linux/amd64. -asan enable interoperation with address sanitizer. Supported only on linux/arm64, linux/amd64, linux/loong64. Supported on linux/amd64 or linux/arm64 and only with GCC 7 and higher or Clang/LLVM 9 and higher. And supported on linux/loong64 only with Clang/LLVM 16 and higher. -cover enable code coverage instrumentation. -covermode set,count,atomic set the mode for coverage analysis. The default is "set" unless -race is enabled, in which case it is "atomic". The values: set: bool: does this statement run? count: int: how many times does this statement run? atomic: int: count, but correct in multithreaded tests; significantly more expensive. Sets -cover. -coverpkg pattern1,pattern2,pattern3 For a build that targets package 'main' (e.g. building a Go executable), apply coverage analysis to each package matching the patterns. The default is to apply coverage analysis to packages in the main Go module. See 'go help packages' for a description of package patterns. Sets -cover. -v print the names of packages as they are compiled. -work print the name of the temporary work directory and do not delete it when exiting. -x print the commands. -asmflags '[pattern=]arg list' arguments to pass on each go tool asm invocation. -buildmode mode build mode to use. See 'go help buildmode' for more. -buildvcs Whether to stamp binaries with version control information ("true", "false", or "auto"). By default ("auto"), version control information is stamped into a binary if the main package, the main module containing it, and the current directory are all in the same repository. Use -buildvcs=false to always omit version control information, or -buildvcs=true to error out if version control information is available but cannot be included due to a missing tool or ambiguous directory structure. -compiler name name of compiler to use, as in runtime.Compiler (gccgo or gc). -gccgoflags '[pattern=]arg list' arguments to pass on each gccgo compiler/linker invocation. -gcflags '[pattern=]arg list' arguments to pass on each go tool compile invocation. -installsuffix suffix a suffix to use in the name of the package installation directory, in order to keep output separate from default builds. If using the -race flag, the install suffix is automatically set to race or, if set explicitly, has _race appended to it. Likewise for the -msan and -asan flags. Using a -buildmode option that requires non-default compile flags has a similar effect. -ldflags '[pattern=]arg list' arguments to pass on each go tool link invocation. -linkshared build code that will be linked against shared libraries previously created with -buildmode=shared. -mod mode module download mode to use: readonly, vendor, or mod. By default, if a vendor directory is present and the go version in go.mod is 1.14 or higher, the go command acts as if -mod=vendor were set. Otherwise, the go command acts as if -mod=readonly were set. See https://golang.org/ref/mod#build-commands for details. -modcacherw leave newly-created directories in the module cache read-write instead of making them read-only. -modfile file in module aware mode, read (and possibly write) an alternate go.mod file instead of the one in the module root directory. A file named "go.mod" must still be present in order to determine the module root directory, but it is not accessed. When -modfile is specified, an alternate go.sum file is also used: its path is derived from the -modfile flag by trimming the ".mod" extension and appending ".sum". -overlay file read a JSON config file that provides an overlay for build operations. The file is a JSON struct with a single field, named 'Replace', that maps each disk file path (a string) to its backing file path, so that a build will run as if the disk file path exists with the contents given by the backing file paths, or as if the disk file path does not exist if its backing file path is empty. Support for the -overlay flag has some limitations: importantly, cgo files included from outside the include path must be in the same directory as the Go package they are included from, and overlays will not appear when binaries and tests are run through go run and go test respectively. -pgo file specify the file path of a profile for profile-guided optimization (PGO). When the special name "auto" is specified, for each main package in the build, the go command selects a file named "default.pgo" in the package's directory if that file exists, and applies it to the (transitive) dependencies of the main package (other packages are not affected). Special name "off" turns off PGO. The default is "auto". -pkgdir dir install and load all packages from dir instead of the usual locations. For example, when building with a non-standard configuration, use -pkgdir to keep generated packages in a separate location. -tags tag,list a comma-separated list of additional build tags to consider satisfied during the build. For more information about build tags, see 'go help buildconstraint'. (Earlier versions of Go used a space-separated list, and that form is deprecated but still recognized.) -trimpath remove all file system paths from the resulting executable. Instead of absolute file system paths, the recorded file names will begin either a module path@version (when using modules), or a plain import path (when using the standard library, or GOPATH). -toolexec 'cmd args' a program to use to invoke toolchain programs like vet and asm. For example, instead of running asm, the go command will run 'cmd args /path/to/asm <arguments for asm>'. The TOOLEXEC_IMPORTPATH environment variable will be set, matching 'go list -f {{.ImportPath}}' for the package being built. The -asmflags, -gccgoflags, -gcflags, and -ldflags flags accept a space-separated list of arguments to pass to an underlying tool during the build. To embed spaces in an element in the list, surround it with either single or double quotes. The argument list may be preceded by a package pattern and an equal sign, which restricts the use of that argument list to the building of packages matching that pattern (see 'go help packages' for a description of package patterns). Without a pattern, the argument list applies only to the packages named on the command line. The flags may be repeated with different patterns in order to specify different arguments for different sets of packages. If a package matches patterns given in multiple flags, the latest match on the command line wins. For example, 'go build -gcflags=-S fmt' prints the disassembly only for package fmt, while 'go build -gcflags=all=-S fmt' prints the disassembly for fmt and all its dependencies. For more about specifying packages, see 'go help packages'. For more about where packages and binaries are installed, run 'go help gopath'. For more about calling between Go and C/C++, run 'go help c'. Note: Build adheres to certain conventions such as those described by 'go help gopath'. Not all projects can follow these conventions, however. Installations that have their own conventions or that use a separate software build system may choose to use lower-level invocations such as 'go tool compile' and 'go tool link' to avoid some of the overheads and design decisions of the build tool. See also: go install, go get, go clean. `, }
var CmdInstall = &base.Command{ UsageLine: "go install [build flags] [packages]", Short: "compile and install packages and dependencies", Long: ` Install compiles and installs the packages named by the import paths. Executables are installed in the directory named by the GOBIN environment variable, which defaults to $GOPATH/bin or $HOME/go/bin if the GOPATH environment variable is not set. Executables in $GOROOT are installed in $GOROOT/bin or $GOTOOLDIR instead of $GOBIN. If the arguments have version suffixes (like @latest or @v1.0.0), "go install" builds packages in module-aware mode, ignoring the go.mod file in the current directory or any parent directory, if there is one. This is useful for installing executables without affecting the dependencies of the main module. To eliminate ambiguity about which module versions are used in the build, the arguments must satisfy the following constraints: - Arguments must be package paths or package patterns (with "..." wildcards). They must not be standard packages (like fmt), meta-patterns (std, cmd, all), or relative or absolute file paths. - All arguments must have the same version suffix. Different queries are not allowed, even if they refer to the same version. - All arguments must refer to packages in the same module at the same version. - Package path arguments must refer to main packages. Pattern arguments will only match main packages. - No module is considered the "main" module. If the module containing packages named on the command line has a go.mod file, it must not contain directives (replace and exclude) that would cause it to be interpreted differently than if it were the main module. The module must not require a higher version of itself. - Vendor directories are not used in any module. (Vendor directories are not included in the module zip files downloaded by 'go install'.) If the arguments don't have version suffixes, "go install" may run in module-aware mode or GOPATH mode, depending on the GO111MODULE environment variable and the presence of a go.mod file. See 'go help modules' for details. If module-aware mode is enabled, "go install" runs in the context of the main module. When module-aware mode is disabled, non-main packages are installed in the directory $GOPATH/pkg/$GOOS_$GOARCH. When module-aware mode is enabled, non-main packages are built and cached but not installed. Before Go 1.20, the standard library was installed to $GOROOT/pkg/$GOOS_$GOARCH. Starting in Go 1.20, the standard library is built and cached but not installed. Setting GODEBUG=installgoroot=all restores the use of $GOROOT/pkg/$GOOS_$GOARCH. For more about build flags, see 'go help build'. For more about specifying packages, see 'go help packages'. See also: go build, go get, go clean. `, }
ExecCmd is the command to use to run user binaries. Normally it is empty, meaning run the binaries directly. If cross-compiling and running on a remote system or simulator, it is typically go_GOOS_GOARCH_exec, with the target GOOS and GOARCH substituted. The -exec flag overrides these defaults.
var ExecCmd []string
var GccgoName, GccgoBin string
Tests can override this by setting $TESTGO_TOOLCHAIN_VERSION.
var ToolchainVersion = runtime.Version()
VetExplicit records whether the vet flags were set explicitly on the command line.
var VetExplicit bool
VetFlags are the default flags to pass to vet. The caller is expected to set them before executing any vet actions.
var VetFlags []string
VetTool is the path to an alternate vet tool binary. The caller is expected to set it (if needed) before executing any vet actions.
var VetTool string
func AddBuildFlags(cmd *base.Command, mask BuildFlagMask)
AddBuildFlags adds the flags common to the build, clean, get, install, list, run, and test commands.
func AddCoverFlags(cmd *base.Command, coverProfileFlag *string)
AddCoverFlags adds coverage-related flags to "cmd". If the CoverageRedesign experiment is enabled, we add -cover{mode,pkg} to the build command and only -coverprofile to the test command. If the CoverageRedesign experiment is disabled, -cover* flags are added only to the test command.
func BuildActionCoverMetaFile(runAct *Action) (string, error)
BuildActionCoverMetaFile locates and returns the path of the meta-data file written by the "go tool cover" step as part of the build action for the "go test -cover" run action 'runAct'. Note that if the package has no functions the meta-data file will exist but will be empty; in this case the return is an empty string.
func BuildInit()
func BuildInstallFunc(b *Builder, ctx context.Context, a *Action) (err error)
BuildInstallFunc is the action for installing a single package or executable.
func CheckGOOSARCHPair(goos, goarch string) error
func FindExecCmd() []string
FindExecCmd derives the value of ExecCmd to use. It returns that value and leaves ExecCmd set for direct use.
func InstallPackages(ctx context.Context, patterns []string, pkgs []*load.Package)
func WriteCoverMetaFilesFile(b *Builder, ctx context.Context, a *Action) error
WriteCoverMetaFilesFile writes out a summary file ("meta-files file") as part of the action function for the "writeCoverMeta" pseudo action employed during "go test -coverpkg" runs where there are multiple tests and multiple packages covered. It builds up a table mapping package import path to meta-data file fragment and writes it out to a file where it can be read by the various test run actions. Note that this function has to be called A) after the build actions are complete for all packages being tested, and B) before any of the "run test" actions for those packages happen. This requirement is enforced by adding making this action ("a") dependent on all test package build actions, and making all test run actions dependent on this action.
func WriteCoveragePercent(b *Builder, runAct *Action, mf string, w io.Writer) error
WriteCoveragePercent writes out to the writer 'w' a "percent statements covered" for the package whose test-run action is 'runAct', based on the meta-data file 'mf'. This helper is used in cases where a user runs "go test -cover" on a package that has functions but no tests; in the normal case (package has tests) the percentage is written by the test binary when it runs.
func WriteCoverageProfile(b *Builder, runAct *Action, mf, outf string, w io.Writer) error
WriteCoverageProfile writes out a coverage profile fragment for the package whose test-run action is 'runAct'; content is written to the file 'outf' based on the coverage meta-data info found in 'mf'. This helper is used in cases where a user runs "go test -cover" on a package that has functions but no tests.
An Action represents a single action in the action graph.
type Action struct {
Mode string // description of action operation
Package *load.Package // the package this action works on
Deps []*Action // actions that must happen before this one
Actor Actor // the action itself (nil = no-op)
IgnoreFail bool // whether to run f even if dependencies fail
TestOutput *bytes.Buffer // test output buffer
Args []string // additional args for runProgram
TryCache func(*Builder, *Action) bool // callback for cache bypass
// Generated files, directories.
Objdir string // directory for intermediate objects
Target string // goal of the action: the created package or executable
VetxOnly bool // Mode=="vet": only being called to supply info about dependencies
Failed bool // whether the action failed
// contains filtered or unexported fields
}
func (a *Action) BuildActionID() string
BuildActionID returns the action ID section of a's build ID.
func (a *Action) BuildContentID() string
BuildContentID returns the content ID section of a's build ID.
func (a *Action) BuildID() string
BuildID returns a's build ID.
func (a *Action) BuiltTarget() string
BuiltTarget returns the actual file that was built. This differs from Target when the result was cached.
An Actor runs an action.
type Actor interface {
Act(*Builder, context.Context, *Action) error
}
An ActorFunc is an Actor that calls the function.
type ActorFunc func(*Builder, context.Context, *Action) error
func (f ActorFunc) Act(b *Builder, ctx context.Context, a *Action) error
type BuildFlagMask int
const (
DefaultBuildFlags BuildFlagMask = 0
OmitModFlag BuildFlagMask = 1 << iota
OmitModCommonFlags
OmitVFlag
)
BuildMode specifies the build mode: are we just building things or also installing the results?
type BuildMode int
const (
ModeBuild BuildMode = iota
ModeInstall
ModeBuggyInstall
ModeVetOnly = 1 << 8
)
A Builder holds global state about a build. It does not hold per-package state, because we build packages in parallel, and the builder is shared.
type Builder struct {
WorkDir string // the temporary work directory (ends in filepath.Separator)
IsCmdList bool // running as part of go list; set p.Stale and additional fields below
NeedError bool // list needs p.Error
NeedExport bool // list needs p.Export
NeedCompiledGoFiles bool // list needs p.CompiledGoFiles
AllowErrors bool // errors don't immediately exit the program
// contains filtered or unexported fields
}
func NewBuilder(workDir string) *Builder
NewBuilder returns a new Builder ready for use.
If workDir is the empty string, NewBuilder creates a WorkDir if needed and arranges for it to be removed in case of an unclean exit. The caller must Close the builder explicitly to clean up the WorkDir before a clean exit.
func (b *Builder) AutoAction(mode, depMode BuildMode, p *load.Package) *Action
AutoAction returns the "right" action for go build or go install of p.
func (b *Builder) BackgroundShell() *Shell
BackgroundShell returns a Builder-wide Shell that's not bound to any Action. Try not to use this unless there's really no sensible Action available.
func (b *Builder) CFlags(p *load.Package) (cppflags, cflags, cxxflags, fflags, ldflags []string, err error)
CFlags returns the flags to use when invoking the C, C++ or Fortran compilers, or cgo.
func (b *Builder) Close() error
func (b *Builder) CompileAction(mode, depMode BuildMode, p *load.Package) *Action
CompileAction returns the action for compiling and possibly installing (according to mode) the given package. The resulting action is only for building packages (archives), never for linking executables. depMode is the action (build or install) to use when building dependencies. To turn package main into an executable, call b.Link instead.
func (b *Builder) CovData(a *Action, cmdargs ...any) ([]byte, error)
CovData invokes "go tool covdata" with the specified arguments as part of the execution of action 'a'.
func (b *Builder) Do(ctx context.Context, root *Action)
Do runs the action graph rooted at root.
func (b *Builder) GccCmd(incdir, workdir string) []string
GccCmd returns a gcc command line prefix defaultCC is defined in zdefaultcc.go, written by cmd/dist.
func (b *Builder) GxxCmd(incdir, workdir string) []string
GxxCmd returns a g++ command line prefix defaultCXX is defined in zdefaultcc.go, written by cmd/dist.
func (b *Builder) LinkAction(mode, depMode BuildMode, p *load.Package) *Action
LinkAction returns the action for linking p into an executable and possibly installing the result (according to mode). depMode is the action (build or install) to use when compiling dependencies.
func (b *Builder) NewObjdir() string
NewObjdir returns the name of a fresh object directory under b.WorkDir. It is up to the caller to call b.Mkdir on the result at an appropriate time. The result ends in a slash, so that file names in that directory can be constructed with direct string addition.
NewObjdir must be called only from a single goroutine at a time, so it is safe to call during action graph construction, but it must not be called during action graph execution.
func (b *Builder) PkgconfigCmd() string
PkgconfigCmd returns a pkg-config binary name defaultPkgConfig is defined in zdefaultcc.go, written by cmd/dist.
func (b *Builder) Shell(a *Action) *Shell
Shell returns a shell for running commands on behalf of Action a.
func (b *Builder) VetAction(mode, depMode BuildMode, p *load.Package) *Action
VetAction returns the action for running go vet on package p. It depends on the action for compiling p. If the caller may be causing p to be installed, it is up to the caller to make sure that the install depends on (runs after) vet.
A Shell runs shell commands and performs shell-like file system operations.
Shell tracks context related to running commands, and form a tree much like context.Context.
type Shell struct {
// contains filtered or unexported fields
}
func NewShell(workDir string, print func(a ...any) (int, error)) *Shell
NewShell returns a new Shell.
Shell will internally serialize calls to the print function. If print is nil, it defaults to printing to stderr.
func (sh *Shell) CopyFile(dst, src string, perm fs.FileMode, force bool) error
copyFile is like 'cp src dst'.
func (sh *Shell) Mkdir(dir string) error
Mkdir makes the named directory.
func (sh *Shell) Print(a ...any)
Print emits a to this Shell's output stream, formatting it like fmt.Print. It is safe to call concurrently.
func (sh *Shell) RemoveAll(paths ...string) error
RemoveAll is like 'rm -rf'. It attempts to remove all paths even if there's an error, and returns the first error.
func (sh *Shell) ShowCmd(dir string, format string, args ...any)
ShowCmd prints the given command to standard output for the implementation of -n or -x.
ShowCmd also replaces the name of the current script directory with dot (.) but only when it is at the beginning of a space-separated token.
If dir is not "" or "/" and not the current script directory, ShowCmd first prints a "cd" command to switch to dir and updates the script directory.
func (sh *Shell) Symlink(oldname, newname string) error
Symlink creates a symlink newname -> oldname.
func (sh *Shell) WithAction(a *Action) *Shell
WithAction returns a Shell identical to sh, but bound to Action a.