gsanity-check gets a -e swith to print what it thinks the environment…

… looks like.

shared/environment.go

@@ -103,3 +103,13 @@ func init() {
 	LLVMLoggingFile = os.Getenv(envfile)
 
 }
+
+func printEnvironment() {
+	vars := []string{envpath, envcc, envcxx, envar, envlnk, envcfg, envbc, envlvl, envfile}
+
+	LogWrite("\nLiving in this environment:\n\n")
+	for _, v := range vars {
+		LogWrite("%v = %v\n", v, os.Getenv(v))
+	}
+
+}

shared/sanity.go

@@ -35,6 +35,7 @@ package shared
 
 import (
 	"bytes"
+	"flag"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -87,6 +88,10 @@ then LLVM_AR_NAME should be set to llvm-ar-3.5.
 
 `
 
+type sanityArgs struct {
+	Environment bool
+}
+
 // SanityCheck performs the environmental sanity check.
 //
 //        Performs the following checks in order:
@@ -98,8 +103,14 @@ then LLVM_AR_NAME should be set to llvm-ar-3.5.
 //
 func SanityCheck() {
 
+	sa := parseSanitySwitches()
+
 	LogWrite("\nVersion info: gsanity-check version %v\nReleased: %v\n", gllvmVersion, gllvmReleaseDate)
 
+	if sa.Environment {
+		printEnvironment()
+	}
+
 	checkLogging()
 
 	checkOS()
@@ -116,6 +127,20 @@ func SanityCheck() {
 
 }
 
+func parseSanitySwitches() (sa sanityArgs) {
+	sa = sanityArgs{
+		Environment: false,
+	}
+
+	environmentPtr := flag.Bool("e", false, "show environment")
+
+	flag.Parse()
+
+	sa.Environment = *environmentPtr
+
+	return
+}
+
 func checkOS() {
 
 	platform := runtime.GOOS