Allow library files to be specified on the iverilog command line.

This was already supported in command files, using the '-v' flag.
'-v' is already in use on the command line, so use '-l' instead,
and make that an alias for '-v' in command files.

(cherry picked from commit 7ddc514518)

driver/cflexor.lex

@@ -4,7 +4,7 @@
 
 %{
 /*
- * Copyright (c) 2001-2014 Stephen Williams (steve@icarus.com)
+ * Copyright (c) 2001-2016 Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -124,7 +124,8 @@ int cmdfile_stack_ptr = 0;
 "-c" { return TOK_Dc; }
 "-f" { return TOK_Dc; }
 
-  /* Notice the -v flag. */
+  /* Notice the -l or -v flag. */
+"-l" { return TOK_Dv; }
 "-v" { return TOK_Dv; }
 
   /* Notice the -y flag. */

driver/iverilog.man.in

@@ -1,14 +1,15 @@
-.TH iverilog 1 "Mar 5th, 2016" "" "Version %M.%n%E"
+.TH iverilog 1 "Oct 2nd, 2016" "" "Version %M.%n%E"
 .SH NAME
 iverilog - Icarus Verilog compiler
 
 .SH SYNOPSIS
 .B iverilog
 [\-ESVv] [\-Bpath] [\-ccmdfile|\-fcmdfile] [\-Dmacro[=defn]]
-[\-Pparameter=value] [\-pflag=value]
+[\-Pparameter=value] [\-pflag=value] [\-dname]
-[\-dname] [\-g1995|\-g2001|\-g2005|\-g2005-sv|\-g2009|\-g2012|\-g<feature>]
+[\-g1995\:|\-g2001\:|\-g2005\:|\-g2005-sv\:|\-g2009\:|\-g2012\:|\-g<feature>]
 [\-Iincludedir] [\-mmodule] [\-M[mode=]file] [\-Nfile] [\-ooutputfilename]
-[\-stopmodule] [\-ttype] [\-Tmin/typ/max] [\-Wclass] [\-ypath] sourcefile
+[\-stopmodule] [\-ttype] [\-Tmin/typ/max] [\-Wclass] [\-ypath] [\-lfile]
+sourcefile
 
 .SH DESCRIPTION
 .PP
@@ -150,6 +151,12 @@ for Verilog include files. The \fB\-I\fP switch may be used many times
 to specify several directories to search, the directories are searched
 in the order they appear on the command line.
 .TP 8
+.B -l\fIfile\fP
+Add the specified file to the list of source files to be compiled,
+but mark it as a library file. All modules contained within that
+file will be treated as library modules, and only elaborated if
+they are instantiated by other modules in the design.
+.TP 8
 .B -M\fIpath\fP
 This is equivalent to \fB\-Mall=path\fP. Preserved for backwards
 compatibility.
@@ -413,6 +420,15 @@ A \fB\-c\fP or \fB\-f\fP token prefixes a command file, exactly like it
 does on the command line. The cmdfile may be on the same line or the
 next non-comment line.
 
+.TP 8
+.B -l\ \fIfile\fP -v\ \fIfile\fP
+A \fB\-l\fP token prefixes a library file in the command file,
+exactly like it does on the command line. The parameter to the \fB\-l\fP
+flag may be on the same line or the next non-comment line. \fB\-v\fP is
+an alias for \fB\-l\fP, provided for compatibility with other simulators.
+
+Variables in the \fIfile\fP are substituted.
+
 .TP 8
 .B -y\ \fIlibdir\fP
 A \fB\-y\fP token prefixes a library directory in the command file,

driver/main.c

@@ -44,7 +44,7 @@ const char HELP[] =
 "                [-M [mode=]depfile] [-m module]\n"
 "                [-N file] [-o filename] [-p flag=value]\n"
 "                [-s topmodule] [-t target] [-T min|typ|max]\n"
-"                [-W class] [-y dir] [-Y suf] source_file(s)\n"
+"                [-W class] [-y dir] [-Y suf] [-l file] source_file(s)\n"
 "\n"
 "See the man page for details.";
 
@@ -928,7 +928,7 @@ int main(int argc, char **argv)
 	}
       }
 
-      while ((opt = getopt(argc, argv, "B:c:D:d:Ef:g:hI:M:m:N:o:P:p:Ss:T:t:vVW:y:Y:")) != EOF) {
+      while ((opt = getopt(argc, argv, "B:c:D:d:Ef:g:hl:I:M:m:N:o:P:p:Ss:T:t:vVW:y:Y:")) != EOF) {
 
 	    switch (opt) {
 		case 'B':
@@ -983,6 +983,10 @@ int main(int argc, char **argv)
 		  process_include_dir(optarg);
 		  break;
 
+		case 'l':
+		  process_file_name(optarg, 1);
+		  break;
+
 		case 'M':
 		  if (process_depfile(optarg) != 0)
                         return -1;