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--- go_env [2018/04/10 16:02] – created rpjday
+++ go_env [2018/04/10 17:04] (current) – [go env] rpjday
@@ Line 30: / Line 30: @@
 PKG_CONFIG="pkg-config"
 GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build110643148=/tmp/go-build -gno-record-gcc-switches"
+$
+</code>
+===== go help environment =====
+<code>
+$ go help environment
+The go command, and the tools it invokes, examine a few different
+environment variables. For many of these, you can see the default
+value of on your system by running 'go env NAME', where NAME is the
+name of the variable.
+General-purpose environment variables:
+	GCCGO
+		The gccgo command to run for 'go build -compiler=gccgo'.
+	GOARCH
+		The architecture, or processor, for which to compile code.
+		Examples are amd64, 386, arm, ppc64.
+	GOBIN
+		The directory where 'go install' will install a command.
+	GOOS
+		The operating system for which to compile code.
+		Examples are linux, darwin, windows, netbsd.
+	GOPATH
+		For more details see: 'go help gopath'.
+	GORACE
+		Options for the race detector.
+		See https://golang.org/doc/articles/race_detector.html.
+	GOROOT
+		The root of the go tree.
+	GOTMPDIR
+		The directory where the go command will write
+		temporary source files, packages, and binaries.
+	GOCACHE
+		The directory where the go command will store
+		cached information for reuse in future builds.
+Environment variables for use with cgo:
+	CC
+		The command to use to compile C code.
+	CGO_ENABLED
+		Whether the cgo command is supported. Either 0 or 1.
+	CGO_CFLAGS
+		Flags that cgo will pass to the compiler when compiling
+		C code.
+	CGO_CFLAGS_ALLOW
+		A regular expression specifying additional flags to allow
+		to appear in #cgo CFLAGS source code directives.
+		Does not apply to the CGO_CFLAGS environment variable.
+	CGO_CFLAGS_DISALLOW
+		A regular expression specifying flags that must be disallowed
+		from appearing in #cgo CFLAGS source code directives.
+		Does not apply to the CGO_CFLAGS environment variable.
+	CGO_CPPFLAGS, CGO_CPPFLAGS_ALLOW, CGO_CPPFLAGS_DISALLOW
+		Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+		but for the C preprocessor.
+	CGO_CXXFLAGS, CGO_CXXFLAGS_ALLOW, CGO_CXXFLAGS_DISALLOW
+		Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+		but for the C++ compiler.
+	CGO_FFLAGS, CGO_FFLAGS_ALLOW, CGO_FFLAGS_DISALLOW
+		Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+		but for the Fortran compiler.
+	CGO_LDFLAGS, CGO_LDFLAGS_ALLOW, CGO_LDFLAGS_DISALLOW
+		Like CGO_CFLAGS, CGO_CFLAGS_ALLOW, and CGO_CFLAGS_DISALLOW,
+		but for the linker.
+	CXX
+		The command to use to compile C++ code.
+	PKG_CONFIG
+		Path to pkg-config tool.
+Architecture-specific environment variables:
+	GOARM
+		For GOARCH=arm, the ARM architecture for which to compile.
+		Valid values are 5, 6, 7.
+	GO386
+		For GOARCH=386, the floating point instruction set.
+		Valid values are 387, sse2.
+	GOMIPS
+		For GOARCH=mips{,le}, whether to use floating point instructions.
+		Valid values are hardfloat (default), softfloat.
+Special-purpose environment variables:
+	GOROOT_FINAL
+		The root of the installed Go tree, when it is
+		installed in a location other than where it is built.
+		File names in stack traces are rewritten from GOROOT to
+		GOROOT_FINAL.
+	GO_EXTLINK_ENABLED
+		Whether the linker should use external linking mode
+		when using -linkmode=auto with code that uses cgo.
+		Set to 0 to disable external linking mode, 1 to enable it.
+	GIT_ALLOW_PROTOCOL
+		Defined by Git. A colon-separated list of schemes that are allowed to be used
+		with git fetch/clone. If set, any scheme not explicitly mentioned will be
+		considered insecure by 'go get'.
 $
 </code>