Added an new AUDIT logging level betwix WARNING and INFO that just logs the calls.

Author: ianamason

README.md

@@ -175,6 +175,7 @@ variable to one of the following levels:
 
  * `ERROR`
  * `WARNING`
+ * `AUDIT`
  * `INFO`
  * `DEBUG`
 
@@ -184,6 +185,8 @@ For example:
 ```
 Output will be directed to the standard error stream, unless you specify the
 path of a logfile via the `WLLVM_OUTPUT_FILE` environment variable.
+The `AUDIT` level, new in 2022, logs only the calls to the compiler, and indicates 
+whether each call is *compiling* or *linking*, the compiler used, and the arguments provided.
 
 For example:
 ```

shared/compiler.go

@@ -312,12 +312,12 @@ func execCompile(compilerExecName string, pr ParserResult, wg *sync.WaitGroup, o
 	//     But for the now, we just remove forbidden arguments
 	var success bool
 	var err error
-	var linking = false
+	var mode = "COMPILING"
 	// start afresh
 	arguments := []string{}
 	// we are linking rather than compiling
 	if len(pr.InputFiles) == 0 && len(pr.LinkArgs) > 0 {
-		linking = true
+		mode = "LINKING"
 		if pr.IsLTO {
 			arguments = append(arguments, LLVMLtoLDFLAGS...)
 		}
@@ -339,11 +339,7 @@ func execCompile(compilerExecName string, pr ParserResult, wg *sync.WaitGroup, o
 	} else {
 		arguments = append(arguments, pr.InputList...)
 	}
-	if linking {
-		LogInfo("LINKING with %v using %v", compilerExecName, arguments)
-	} else {
-		LogInfo("COMPILING with %v using %v", compilerExecName, arguments)
-	}
+	LogAudit("%v %v %v", mode, compilerExecName, arguments)
 	LogDebug("Calling execCmd(%v, %v)", compilerExecName, arguments)
 	success, err = execCmd(compilerExecName, arguments, "")
 	if !success {

shared/logging.go

@@ -42,6 +42,7 @@ import (
 const (
 	errorV = iota
 	warningV
+	auditV
 	infoV
 	debugV
 )
@@ -50,18 +51,20 @@ const (
 var loggingLevels = map[string]int{
 	"ERROR":   errorV,
 	"WARNING": warningV,
+	"AUDIT":   auditV,
 	"INFO":    infoV,
 	"DEBUG":   debugV,
 }
 
 var loggingPrefixes = map[int]string{
 	errorV:   "ERROR:",
 	warningV: "WARNING:",
+	auditV:   "AUDIT:",
 	infoV:    "INFO:",
 	debugV:   "DEBUG:",
 }
 
-// loggingLevel is the user configured level of logging: ERROR, WARNING, INFO, DEBUG
+// loggingLevel is the user configured level of logging: ERROR, WARNING, AUDIT, INFO, DEBUG
 var loggingLevel = warningV
 
 // loggingFilePointer is where the logging is streamed too.
@@ -114,6 +117,9 @@ var LogInfo = makeLogger(infoV)
 // LogWarning logs to the configured stream if the logging level is WARNING or lower.
 var LogWarning = makeLogger(warningV)
 
+// LogAudit logs to the configured stream if the logging level is AUDIT or lower.
+var LogAudit = makeLogger(auditV)
+
 // LogError logs to the configured stream if the logging level is ERROR or lower.
 var LogError = makeLogger(errorV)