We are deprecating the $log function in favor of $log10.

When the VAMS math functions were originally built we did a
straight copy of the log() function to $log(). This can
conflict with other Verilog-D definitions of $log. We
need to deprecate this function and remove it before the
next major release.

va_math.txt

@@ -11,7 +11,7 @@ License.
   Verilog-A math library built for Icarus Verilog
   http://www.icarus.com/eda/verilog/
 
-  Copyright (C) 2007-2008  Cary R. (cygcary@yahoo.com)
+  Copyright (C) 2007-2009  Cary R. (cygcary@yahoo.com)
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -38,7 +38,7 @@ like all Verilog-D system functions the name must be prefixed with a '$'.
 For reference the functions are:
 
   $ln(x)       --  Natural logarithm
-  $log(x)      --  Decimal logarithm
+  $log10(x)    --  Decimal logarithm  // $log is being deprecated!
   $exp(x)      --  Exponential
   $sqrt(x)     --  Square root
   $min(x,y)    --  Minimum

vpi/va_math.c

@@ -238,6 +238,12 @@ static PLI_INT32 va_single_argument_compiletf(PLI_BYTE8 *ud)
                    single_funcs_count*sizeof(va_single_t **));
     single_funcs[single_funcs_count-1] = fun_data;
 
+    if (strcmp(name, "$log") == 0) {
+        vpi_printf("%s:%d: deprecation: ", vpi_get_str(vpiFile, callh),
+                   (int)vpi_get(vpiLineNo, callh));
+        vpi_printf("Please use $log10() instead of $log()!\n");
+    }
+
     /* vpi_scan() returning 0 (NULL) has already freed argv. */
     return 0;
 }