Add the ability to disable deprecation warnings with a cmd line switch

The `--depwarn={yes|no}` flag turns on/off method warnings and deprecated syntax warnings
in the parser.

(unexported) `compileropts()` method added to retrieve the
compileropts struct from libjulia.

(unexported) `syntax_deprecation_warnings(::Bool)` method added to
turn off syntax deprecation warnings in the parser at runtime.
the method returns the previous syntax deprecation warning state.

add NEWS entry and update docs for command line switches

NEWS.md

@@ -65,6 +65,8 @@ Compiler improvements
 
   * Accessing fields that are always initialized no longer produces undefined checks ([#8827]).
 
+  * `--no-depwarn` command line flag added to turn off syntax and method deprecation warnings ([#9294]).
+
 Library improvements
 --------------------
 

base/client.jl

@@ -129,6 +129,9 @@ end
 
 _repl_start = Condition()
 
+syntax_deprecation_warnings(warn::Bool) =
+    bool(ccall(:jl_parse_depwarn, Cint, (Cint,), warn))
+
 function parse_input_line(s::AbstractString)
     # s = bytestring(s)
     # (expr, pos) = parse(s, 1)

base/deprecated.jl

@@ -36,9 +36,11 @@ macro deprecate(old,new)
 end
 
 function depwarn(msg, funcsym)
-    bt = backtrace()
-    caller = firstcaller(bt, funcsym)
-    warn(msg, once=(caller!=C_NULL), key=caller, bt=bt)
+    if bool(compileropts().depwarn)
+        bt = backtrace()
+        caller = firstcaller(bt, funcsym)
+        warn(msg, once=(caller!=C_NULL), key=caller, bt=bt)
+    end
 end
 
 function firstcaller(bt::Array{Ptr{Void},1}, funcsym::Symbol)

base/util.jl

@@ -241,3 +241,18 @@ end
 
 warn(err::Exception; prefix="ERROR: ", kw...) =
     warn(sprint(io->showerror(io,err)), prefix=prefix; kw...)
+
+# Julia compiler options struct (see jl_compileropts_t in src/julia.h)
+immutable JLCompilerOpts
+    build_path::Ptr{Cchar}
+    code_coverage::Int8
+    malloc_log::Int8
+    check_bounds::Int8
+    dumpbitcode::Int8
+    int_literals::Cint
+    compile_enabled::Int8
+    opt_level::Int8
+    depwarn::Int8
+end
+
+compileropts() = unsafe_load(cglobal(:jl_compileropts, JLCompilerOpts))

doc/manual/getting-started.rst

@@ -110,22 +110,30 @@ those available for the ``perl`` and ``ruby`` programs::
 
      -e, --eval <expr>        Evaluate <expr>
      -E, --print <expr>       Evaluate and show <expr>
-     -P, --post-boot <expr>   Evaluate <expr> right after boot
-     -L, --load <file>        Load <file> right after boot on all processors
+     -P, --post-boot <expr>   Evaluate <expr>, but don't disable interactive mode
+     -L, --load <file>        Load <file> immediately on all processors
      -J, --sysimage <file>    Start up with the given system image file
 
      -p <n>                   Run n local processes
      --machinefile <file>     Run processes on hosts listed in <file>
-
+               
      -i                       Force isinteractive() to be true
      --no-history-file        Don't load or save history
      -f, --no-startup         Don't load ~/.juliarc.jl
      -F                       Load ~/.juliarc.jl, then handle remaining inputs
      --color={yes|no}         Enable or disable color text
 
-     --code-coverage          Count executions of source lines
+     --compile={yes|no|all}   Enable or disable compiler, or request exhaustive compilation
+                     
+     --code-coverage={none|user|all}, --code-coverage
+                              Count executions of source lines (omitting setting is equivalent to 'user')
+     --track-allocation={none|user|all}
+                              Count bytes allocated by each source line
      --check-bounds={yes|no}  Emit bounds checks always or never (ignoring declarations)
+     -O, --optimize           Run time-intensive code optimizations
      --int-literals={32|64}   Select integer literal size independent of platform
+     --dump-bitcode={yes|no}  Dump bitcode for the system image (used with --build)
+     --depwarn={yes|no}       Enable or disable syntax and method deprecation warnings
 
 
 Resources

src/ast.c

@@ -114,6 +114,8 @@ static builtinspec_t julia_flisp_ast_ext[] = {
     { NULL, NULL }
 };
 
+extern int jl_parse_depwarn(int warn);
+
 DLLEXPORT void jl_init_frontend(void)
 {
     fl_init(4*1024*1024);
@@ -136,6 +138,9 @@ DLLEXPORT void jl_init_frontend(void)
     false_sym = symbol("false");
     fl_error_sym = symbol("error");
     fl_null_sym = symbol("null");
+
+    // Enable / disable syntax deprecation warnings
+    jl_parse_depwarn((int)jl_compileropts.depwarn);
 }
 
 DLLEXPORT void jl_lisp_prompt(void)
@@ -507,6 +512,12 @@ void jl_stop_parsing(void)
     fl_applyn(0, symbol_value(symbol("jl-parser-close-stream")));
 }
 
+DLLEXPORT int jl_parse_depwarn(int warn)
+{
+    value_t prev = fl_applyn(1, symbol_value(symbol("jl-parser-depwarn")), warn? FL_T : FL_F);
+    return prev == FL_T ? 1 : 0;
+}
+
 extern int jl_lineno;
 
 jl_value_t *jl_parse_next(void)

src/init.c

@@ -88,7 +88,8 @@ jl_compileropts_t jl_compileropts = { NULL, // build_path
                                       JL_COMPILEROPT_DUMPBITCODE_OFF,
                                       0,    // int_literals
                                       JL_COMPILEROPT_COMPILE_DEFAULT,
-                                      0     // opt_level
+                                      0,    // opt_level
+                                      1,    // depwarn
 };
 
 int jl_boot_file_loaded = 0;

src/jlfrontend.scm

@@ -187,6 +187,12 @@
   (set! *filename-stack* (cdr *filename-stack*))
   (set! *ts-stack* (cdr *ts-stack*)))
 
+(define *depwarn* #t)
+(define (jl-parser-depwarn w)
+  (let ((prev *depwarn*))
+    (set! *depwarn* (eq? w #t))
+    prev))
+
 (define (jl-parser-next)
   (let* ((err (parser-wrap
 	       (lambda ()

src/julia-parser.scm

@@ -501,17 +501,18 @@
 ;; --- misc ---
 
 (define (syntax-deprecation-warning s what instead)
-  (io.write
-   *stderr*
-   (string
-    #\newline "WARNING: deprecated syntax \"" what "\""
-    (if (eq? current-filename 'none)
-	""
-	(string " at " current-filename ":" (input-port-line (ts:port s))))
-    "."
-    (if (equal? instead "")
-	""
-	(string #\newline "Use \"" instead "\" instead." #\newline)))))
+  (if *depwarn*
+    (io.write
+     *stderr*
+     (string
+      #\newline "WARNING: deprecated syntax \"" what "\""
+      (if (eq? current-filename 'none)
+	  ""
+	  (string " at " current-filename ":" (input-port-line (ts:port s))))
+      "."
+      (if (equal? instead "")
+	  ""
+	  (string #\newline "Use \"" instead "\" instead." #\newline))))))
 
 ;; --- parser ---
 

src/julia.h

@@ -872,6 +872,7 @@ void jl_init_restored_modules();
 // front end interface
 DLLEXPORT jl_value_t *jl_parse_input_line(const char *str);
 DLLEXPORT jl_value_t *jl_parse_string(const char *str, int pos0, int greedy);
+DLLEXPORT int jl_parse_depwarn(int warn);
 int jl_start_parsing_file(const char *fname);
 void jl_stop_parsing(void);
 jl_value_t *jl_parse_next(void);
@@ -1336,6 +1337,7 @@ typedef struct {
     int int_literals;
     int8_t compile_enabled;
     int8_t opt_level;
+    int8_t depwarn;
 } jl_compileropts_t;
 
 extern DLLEXPORT jl_compileropts_t jl_compileropts;

ui/repl.c

@@ -87,7 +87,8 @@ static const char *opts =
     " --check-bounds={yes|no}  Emit bounds checks always or never (ignoring declarations)\n"
     " -O, --optimize           Run time-intensive code optimizations\n"
     " --int-literals={32|64}   Select integer literal size independent of platform\n"
-    " --dump-bitcode={yes|no}  Dump bitcode for the system image (used with --build)\n";
+    " --dump-bitcode={yes|no}  Dump bitcode for the system image (used with --build)\n"
+    " --depwarn={yes|no}       Enable or disable syntax and method deprecation warnings\n";
 
 void parse_opts(int *argcp, char ***argvp)
 {
@@ -106,6 +107,7 @@ void parse_opts(int *argcp, char ***argvp)
         { "int-literals",  required_argument, 0, 301 },
         { "dump-bitcode",  required_argument, 0, 302 },
         { "compile",       required_argument, 0, 303 },
+        { "depwarn",       required_argument, 0, 304 },
         { 0, 0, 0, 0 }
     };
     int c;
@@ -198,6 +200,16 @@ void parse_opts(int *argcp, char ***argvp)
                 exit(1);
             }
             break;
+	case 304:
+	    if (!strcmp(optarg,"yes"))
+                jl_compileropts.depwarn = 1;
+	    else if (!strcmp(optarg,"no"))
+                jl_compileropts.depwarn = 0;
+            else {
+                ios_printf(ios_stderr, "julia: invalid argument to --depwarn (%s)\n", optarg);
+                exit(1);
+            }
+	    break;
         default:
             ios_printf(ios_stderr, "julia: unhandled option -- %c\n",  c);
             ios_printf(ios_stderr, "This is a bug, please report it.\n");