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diff --git a/devdocs/go/go%2Fbuild%2Findex.html b/devdocs/go/go%2Fbuild%2Findex.html new file mode 100644 index 00000000..68a204ff --- /dev/null +++ b/devdocs/go/go%2Fbuild%2Findex.html @@ -0,0 +1,293 @@ +<h1> Package build </h1> <ul id="short-nav"> +<li><code>import "go/build"</code></li> +<li><a href="#pkg-overview" class="overviewLink">Overview</a></li> +<li><a href="#pkg-index" class="indexLink">Index</a></li> +<li><a href="#pkg-subdirectories">Subdirectories</a></li> +</ul> <h2 id="pkg-overview">Overview </h2> <p>Package build gathers information about Go packages. </p> +<h3 id="hdr-Go_Path">Go Path</h3> <p>The Go path is a list of directory trees containing Go source code. It is consulted to resolve imports that cannot be found in the standard Go tree. The default path is the value of the GOPATH environment variable, interpreted as a path list appropriate to the operating system (on Unix, the variable is a colon-separated string; on Windows, a semicolon-separated string; on Plan 9, a list). </p> +<p>Each directory listed in the Go path must have a prescribed structure: </p> +<p>The src/ directory holds source code. The path below 'src' determines the import path or executable name. </p> +<p>The pkg/ directory holds installed package objects. As in the Go tree, each target operating system and architecture pair has its own subdirectory of pkg (pkg/GOOS_GOARCH). </p> +<p>If DIR is a directory listed in the Go path, a package with source in DIR/src/foo/bar can be imported as "foo/bar" and has its compiled form installed to "DIR/pkg/GOOS_GOARCH/foo/bar.a" (or, for gccgo, "DIR/pkg/gccgo/foo/libbar.a"). </p> +<p>The bin/ directory holds compiled commands. Each command is named for its source directory, but only using the final element, not the entire path. That is, the command with source in DIR/src/foo/quux is installed into DIR/bin/quux, not DIR/bin/foo/quux. The foo/ is stripped so that you can add DIR/bin to your PATH to get at the installed commands. </p> +<p>Here's an example directory layout: </p> +<pre data-language="go">GOPATH=/home/user/gocode + +/home/user/gocode/ + src/ + foo/ + bar/ (go code in package bar) + x.go + quux/ (go code in package main) + y.go + bin/ + quux (installed command) + pkg/ + linux_amd64/ + foo/ + bar.a (installed package object) +</pre> <h3 id="hdr-Build_Constraints">Build Constraints</h3> <p>A build constraint, also known as a build tag, is a condition under which a file should be included in the package. Build constraints are given by a line comment that begins </p> +<pre data-language="go">//go:build +</pre> <p>Build constraints may also be part of a file's name (for example, source_windows.go will only be included if the target operating system is windows). </p> +<p>See 'go help buildconstraint' (<a href="https://golang.org/cmd/go/#hdr-Build_constraints">https://golang.org/cmd/go/#hdr-Build_constraints</a>) for details. </p> +<h3 id="hdr-Binary_Only_Packages">Binary-Only Packages</h3> <p>In Go 1.12 and earlier, it was possible to distribute packages in binary form without including the source code used for compiling the package. The package was distributed with a source file not excluded by build constraints and containing a "//go:binary-only-package" comment. Like a build constraint, this comment appeared at the top of a file, preceded only by blank lines and other line comments and with a blank line following the comment, to separate it from the package documentation. Unlike build constraints, this comment is only recognized in non-test Go source files. </p> +<p>The minimal source code for a binary-only package was therefore: </p> +<pre data-language="go">//go:binary-only-package + +package mypkg +</pre> <p>The source code could include additional Go code. That code was never compiled but would be processed by tools like godoc and might be useful as end-user documentation. </p> +<p>"go build" and other commands no longer support binary-only-packages. <a href="#Import">Import</a> and <a href="#ImportDir">ImportDir</a> will still set the BinaryOnly flag in packages containing these comments for use in tools and error messages. </p> <h2 id="pkg-index">Index </h2> <ul id="manual-nav"> +<li><a href="#pkg-variables">Variables</a></li> +<li><a href="#ArchChar">func ArchChar(goarch string) (string, error)</a></li> +<li><a href="#IsLocalImport">func IsLocalImport(path string) bool</a></li> +<li><a href="#Context">type Context</a></li> +<li> <a href="#Context.Import">func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Package, error)</a> +</li> +<li> <a href="#Context.ImportDir">func (ctxt *Context) ImportDir(dir string, mode ImportMode) (*Package, error)</a> +</li> +<li> <a href="#Context.MatchFile">func (ctxt *Context) MatchFile(dir, name string) (match bool, err error)</a> +</li> +<li> <a href="#Context.SrcDirs">func (ctxt *Context) SrcDirs() []string</a> +</li> +<li><a href="#Directive">type Directive</a></li> +<li><a href="#ImportMode">type ImportMode</a></li> +<li><a href="#MultiplePackageError">type MultiplePackageError</a></li> +<li> <a href="#MultiplePackageError.Error">func (e *MultiplePackageError) Error() string</a> +</li> +<li><a href="#NoGoError">type NoGoError</a></li> +<li> <a href="#NoGoError.Error">func (e *NoGoError) Error() string</a> +</li> +<li><a href="#Package">type Package</a></li> +<li> <a href="#Import">func Import(path, srcDir string, mode ImportMode) (*Package, error)</a> +</li> +<li> <a href="#ImportDir">func ImportDir(dir string, mode ImportMode) (*Package, error)</a> +</li> +<li> <a href="#Package.IsCommand">func (p *Package) IsCommand() bool</a> +</li> +</ul> <h3>Package files</h3> <p> <span>build.go</span> <span>doc.go</span> <span>gc.go</span> <span>read.go</span> <span>syslist.go</span> <span>zcgo.go</span> </p> <h2 id="pkg-variables">Variables</h2> <p>ToolDir is the directory containing build tools. </p> +<pre data-language="go">var ToolDir = getToolDir()</pre> <h2 id="ArchChar">func <span>ArchChar</span> </h2> <pre data-language="go">func ArchChar(goarch string) (string, error)</pre> <p>ArchChar returns "?" and an error. In earlier versions of Go, the returned string was used to derive the compiler and linker tool names, the default object file suffix, and the default linker output name. As of Go 1.5, those strings no longer vary by architecture; they are compile, link, .o, and a.out, respectively. </p> +<h2 id="IsLocalImport">func <span>IsLocalImport</span> </h2> <pre data-language="go">func IsLocalImport(path string) bool</pre> <p>IsLocalImport reports whether the import path is a local import path, like ".", "..", "./foo", or "../foo". </p> +<h2 id="Context">type <span>Context</span> </h2> <p>A Context specifies the supporting context for a build. </p> +<pre data-language="go">type Context struct { + GOARCH string // target architecture + GOOS string // target operating system + GOROOT string // Go root + GOPATH string // Go paths + + // Dir is the caller's working directory, or the empty string to use + // the current directory of the running process. In module mode, this is used + // to locate the main module. + // + // If Dir is non-empty, directories passed to Import and ImportDir must + // be absolute. + Dir string // Go 1.14 + + CgoEnabled bool // whether cgo files are included + UseAllFiles bool // use files regardless of go:build lines, file names + Compiler string // compiler to assume when computing target paths + + // The build, tool, and release tags specify build constraints + // that should be considered satisfied when processing go:build lines. + // Clients creating a new context may customize BuildTags, which + // defaults to empty, but it is usually an error to customize ToolTags or ReleaseTags. + // ToolTags defaults to build tags appropriate to the current Go toolchain configuration. + // ReleaseTags defaults to the list of Go releases the current release is compatible with. + // BuildTags is not set for the Default build Context. + // In addition to the BuildTags, ToolTags, and ReleaseTags, build constraints + // consider the values of GOARCH and GOOS as satisfied tags. + // The last element in ReleaseTags is assumed to be the current release. + BuildTags []string + ToolTags []string // Go 1.17 + ReleaseTags []string // Go 1.1 + + // The install suffix specifies a suffix to use in the name of the installation + // directory. By default it is empty, but custom builds that need to keep + // their outputs separate can set InstallSuffix to do so. For example, when + // using the race detector, the go command uses InstallSuffix = "race", so + // that on a Linux/386 system, packages are written to a directory named + // "linux_386_race" instead of the usual "linux_386". + InstallSuffix string // Go 1.1 + + // JoinPath joins the sequence of path fragments into a single path. + // If JoinPath is nil, Import uses filepath.Join. + JoinPath func(elem ...string) string + + // SplitPathList splits the path list into a slice of individual paths. + // If SplitPathList is nil, Import uses filepath.SplitList. + SplitPathList func(list string) []string + + // IsAbsPath reports whether path is an absolute path. + // If IsAbsPath is nil, Import uses filepath.IsAbs. + IsAbsPath func(path string) bool + + // IsDir reports whether the path names a directory. + // If IsDir is nil, Import calls os.Stat and uses the result's IsDir method. + IsDir func(path string) bool + + // HasSubdir reports whether dir is lexically a subdirectory of + // root, perhaps multiple levels below. It does not try to check + // whether dir exists. + // If so, HasSubdir sets rel to a slash-separated path that + // can be joined to root to produce a path equivalent to dir. + // If HasSubdir is nil, Import uses an implementation built on + // filepath.EvalSymlinks. + HasSubdir func(root, dir string) (rel string, ok bool) + + // ReadDir returns a slice of fs.FileInfo, sorted by Name, + // describing the content of the named directory. + // If ReadDir is nil, Import uses os.ReadDir. + ReadDir func(dir string) ([]fs.FileInfo, error) + + // OpenFile opens a file (not a directory) for reading. + // If OpenFile is nil, Import uses os.Open. + OpenFile func(path string) (io.ReadCloser, error) +} +</pre> <p>Default is the default Context for builds. It uses the GOARCH, GOOS, GOROOT, and GOPATH environment variables if set, or else the compiled code's GOARCH, GOOS, and GOROOT. </p> +<pre data-language="go">var Default Context = defaultContext()</pre> <h3 id="Context.Import">func (*Context) <span>Import</span> </h3> <pre data-language="go">func (ctxt *Context) Import(path string, srcDir string, mode ImportMode) (*Package, error)</pre> <p>Import returns details about the Go package named by the import path, interpreting local import paths relative to the srcDir directory. If the path is a local import path naming a package that can be imported using a standard import path, the returned package will set p.ImportPath to that path. </p> +<p>In the directory containing the package, .go, .c, .h, and .s files are considered part of the package except for: </p> +<ul> <li>.go files in package documentation </li> +<li>files starting with _ or . (likely editor temporary files) </li> +<li>files with build constraints not satisfied by the context </li> +</ul> <p>If an error occurs, Import returns a non-nil error and a non-nil *<a href="#Package">Package</a> containing partial information. </p> +<h3 id="Context.ImportDir">func (*Context) <span>ImportDir</span> </h3> <pre data-language="go">func (ctxt *Context) ImportDir(dir string, mode ImportMode) (*Package, error)</pre> <p>ImportDir is like <a href="#Import">Import</a> but processes the Go package found in the named directory. </p> +<h3 id="Context.MatchFile">func (*Context) <span>MatchFile</span> <span title="Added in Go 1.2">1.2</span> </h3> <pre data-language="go">func (ctxt *Context) MatchFile(dir, name string) (match bool, err error)</pre> <p>MatchFile reports whether the file with the given name in the given directory matches the context and would be included in a <a href="#Package">Package</a> created by <a href="#ImportDir">ImportDir</a> of that directory. </p> +<p>MatchFile considers the name of the file and may use ctxt.OpenFile to read some or all of the file's content. </p> +<h3 id="Context.SrcDirs">func (*Context) <span>SrcDirs</span> </h3> <pre data-language="go">func (ctxt *Context) SrcDirs() []string</pre> <p>SrcDirs returns a list of package source root directories. It draws from the current Go root and Go path but omits directories that do not exist. </p> +<h2 id="Directive">type <span>Directive</span> <span title="Added in Go 1.21">1.21</span> </h2> <p>A Directive is a Go directive comment (//go:zzz...) found in a source file. </p> +<pre data-language="go">type Directive struct { + Text string // full line comment including leading slashes + Pos token.Position // position of comment +} +</pre> <h2 id="ImportMode">type <span>ImportMode</span> </h2> <p>An ImportMode controls the behavior of the Import method. </p> +<pre data-language="go">type ImportMode uint</pre> <pre data-language="go">const ( + // If FindOnly is set, Import stops after locating the directory + // that should contain the sources for a package. It does not + // read any files in the directory. + FindOnly ImportMode = 1 << iota + + // If AllowBinary is set, Import can be satisfied by a compiled + // package object without corresponding sources. + // + // Deprecated: + // The supported way to create a compiled-only package is to + // write source code containing a //go:binary-only-package comment at + // the top of the file. Such a package will be recognized + // regardless of this flag setting (because it has source code) + // and will have BinaryOnly set to true in the returned Package. + AllowBinary + + // If ImportComment is set, parse import comments on package statements. + // Import returns an error if it finds a comment it cannot understand + // or finds conflicting comments in multiple source files. + // See golang.org/s/go14customimport for more information. + ImportComment + + // By default, Import searches vendor directories + // that apply in the given source directory before searching + // the GOROOT and GOPATH roots. + // If an Import finds and returns a package using a vendor + // directory, the resulting ImportPath is the complete path + // to the package, including the path elements leading up + // to and including "vendor". + // For example, if Import("y", "x/subdir", 0) finds + // "x/vendor/y", the returned package's ImportPath is "x/vendor/y", + // not plain "y". + // See golang.org/s/go15vendor for more information. + // + // Setting IgnoreVendor ignores vendor directories. + // + // In contrast to the package's ImportPath, + // the returned package's Imports, TestImports, and XTestImports + // are always the exact import paths from the source files: + // Import makes no attempt to resolve or check those paths. + IgnoreVendor +)</pre> <h2 id="MultiplePackageError">type <span>MultiplePackageError</span> <span title="Added in Go 1.4">1.4</span> </h2> <p>MultiplePackageError describes a directory containing multiple buildable Go source files for multiple packages. </p> +<pre data-language="go">type MultiplePackageError struct { + Dir string // directory containing files + Packages []string // package names found + Files []string // corresponding files: Files[i] declares package Packages[i] +} +</pre> <h3 id="MultiplePackageError.Error">func (*MultiplePackageError) <span>Error</span> <span title="Added in Go 1.4">1.4</span> </h3> <pre data-language="go">func (e *MultiplePackageError) Error() string</pre> <h2 id="NoGoError">type <span>NoGoError</span> </h2> <p>NoGoError is the error used by <a href="#Import">Import</a> to describe a directory containing no buildable Go source files. (It may still contain test files, files hidden by build tags, and so on.) </p> +<pre data-language="go">type NoGoError struct { + Dir string +} +</pre> <h3 id="NoGoError.Error">func (*NoGoError) <span>Error</span> </h3> <pre data-language="go">func (e *NoGoError) Error() string</pre> <h2 id="Package">type <span>Package</span> </h2> <p>A Package describes the Go package found in a directory. </p> +<pre data-language="go">type Package struct { + Dir string // directory containing package sources + Name string // package name + ImportComment string // path in import comment on package statement; added in Go 1.4 + Doc string // documentation synopsis + ImportPath string // import path of package ("" if unknown) + Root string // root of Go tree where this package lives + SrcRoot string // package source root directory ("" if unknown) + PkgRoot string // package install root directory ("" if unknown) + PkgTargetRoot string // architecture dependent install root directory ("" if unknown); added in Go 1.5 + BinDir string // command install directory ("" if unknown) + Goroot bool // package found in Go root + PkgObj string // installed .a file + AllTags []string // tags that can influence file selection in this directory; added in Go 1.2 + ConflictDir string // this directory shadows Dir in $GOPATH; added in Go 1.2 + BinaryOnly bool // cannot be rebuilt from source (has //go:binary-only-package comment); added in Go 1.7 + + // Source files + GoFiles []string // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles) + CgoFiles []string // .go source files that import "C" + IgnoredGoFiles []string // .go source files ignored for this build (including ignored _test.go files); added in Go 1.1 + InvalidGoFiles []string // .go source files with detected problems (parse error, wrong package name, and so on); added in Go 1.6 + IgnoredOtherFiles []string // non-.go source files ignored for this build; added in Go 1.16 + CFiles []string // .c source files + CXXFiles []string // .cc, .cpp and .cxx source files; added in Go 1.2 + MFiles []string // .m (Objective-C) source files; added in Go 1.3 + HFiles []string // .h, .hh, .hpp and .hxx source files + FFiles []string // .f, .F, .for and .f90 Fortran source files; added in Go 1.7 + SFiles []string // .s source files + SwigFiles []string // .swig files; added in Go 1.1 + SwigCXXFiles []string // .swigcxx files; added in Go 1.1 + SysoFiles []string // .syso system object files to add to archive + + // Cgo directives + CgoCFLAGS []string // Cgo CFLAGS directives + CgoCPPFLAGS []string // Cgo CPPFLAGS directives; added in Go 1.2 + CgoCXXFLAGS []string // Cgo CXXFLAGS directives; added in Go 1.2 + CgoFFLAGS []string // Cgo FFLAGS directives; added in Go 1.7 + CgoLDFLAGS []string // Cgo LDFLAGS directives + CgoPkgConfig []string // Cgo pkg-config directives + + // Test information + TestGoFiles []string // _test.go files in package + XTestGoFiles []string // _test.go files outside package + + // Go directive comments (//go:zzz...) found in source files. + Directives []Directive // Go 1.21 + TestDirectives []Directive // Go 1.21 + XTestDirectives []Directive // Go 1.21 + + // Dependency information + Imports []string // import paths from GoFiles, CgoFiles + ImportPos map[string][]token.Position // line information for Imports + TestImports []string // import paths from TestGoFiles + TestImportPos map[string][]token.Position // line information for TestImports + XTestImports []string // import paths from XTestGoFiles + XTestImportPos map[string][]token.Position // line information for XTestImports + + // //go:embed patterns found in Go source files + // For example, if a source file says + // //go:embed a* b.c + // then the list will contain those two strings as separate entries. + // (See package embed for more details about //go:embed.) + EmbedPatterns []string // patterns from GoFiles, CgoFiles; added in Go 1.16 + EmbedPatternPos map[string][]token.Position // line information for EmbedPatterns; added in Go 1.16 + TestEmbedPatterns []string // patterns from TestGoFiles; added in Go 1.16 + TestEmbedPatternPos map[string][]token.Position // line information for TestEmbedPatterns; added in Go 1.16 + XTestEmbedPatterns []string // patterns from XTestGoFiles; added in Go 1.16 + XTestEmbedPatternPos map[string][]token.Position // line information for XTestEmbedPatternPos; added in Go 1.16 +} +</pre> <h3 id="Import">func <span>Import</span> </h3> <pre data-language="go">func Import(path, srcDir string, mode ImportMode) (*Package, error)</pre> <p>Import is shorthand for Default.Import. </p> +<h3 id="ImportDir">func <span>ImportDir</span> </h3> <pre data-language="go">func ImportDir(dir string, mode ImportMode) (*Package, error)</pre> <p>ImportDir is shorthand for Default.ImportDir. </p> +<h3 id="Package.IsCommand">func (*Package) <span>IsCommand</span> </h3> <pre data-language="go">func (p *Package) IsCommand() bool</pre> <p>IsCommand reports whether the package is considered a command to be installed (not just a library). Packages named "main" are treated as commands. </p> +<h2 id="pkg-subdirectories">Subdirectories</h2> <div class="pkg-dir"> <table> <tr> <th class="pkg-name">Name</th> <th class="pkg-synopsis">Synopsis</th> </tr> <tr> <td colspan="2"><a href="../index">..</a></td> </tr> <tr> <td class="pkg-name"> <a href="constraint/index">constraint</a> </td> <td class="pkg-synopsis"> Package constraint implements parsing and evaluation of build constraint lines. </td> </tr> </table> </div><div class="_attribution"> + <p class="_attribution-p"> + © Google, Inc.<br>Licensed under the Creative Commons Attribution License 3.0.<br> + <a href="http://golang.org/pkg/go/build/" class="_attribution-link">http://golang.org/pkg/go/build/</a> + </p> +</div> |