Provided by: gccgo-go_1.18~0ubuntu2_amd64 
NAME
go-build - compile the packages named by the import paths
SYNOPSIS
go build [-o output] [build flags] [packages]
DESCRIPTION
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 first source file ('go build ed.go rx.go' writes 'ed' or 'ed.exe') or the source code directory ('go
build unix/sam' writes 'sam' or 'sam.exe'). The '.exe' suffix is added when writing a Windows
executable.
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 -i flag installs the packages that are dependencies of the target.
The -i flag is deprecated. Compiled packages are cached automatically.
OPTIONS
The build flags are shared by the build, clean, get, install, list, run, and test commands:
-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, 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 and only
with Clang/LLVM as the host C compiler. On linux/arm64, pie build mode will be used.
-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.
-compiler name
name of compiler to use, as in runtime.Compiler (gccgo or gc)
-gccgoflags 'arg list'
arguments to pass on each gccgo compiler/linker invocation
-gcflags '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 flag. Using a
-buildmode option that requires non-default compile flags has a similar effect.
-ldflags 'flag 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.
-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 build tags to consider satisfied during the build. For more information
about build tags, see the description of build constraints in the documentation for the go/build
package. (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 with either "go" (for the standard library), or a module
path@version (when using modules), or a plain import path (when using 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-packages(7).
For more about where packages and binaries are installed, see go-gopath(1).
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(1), go-get(1), go-clean(1).
AUTHOR
This manual page was written by Michael Stapelberg <stapelberg@debian.org> and is maintained by the
Debian Go Compiler Team <team+go-compiler@tracker.debian.org> based on the output of 'go help build' for
the Debian project (and may be used by others).
2021-10-15 GO-BUILD(1)