toplev.c (flag_exceptions): Default to 0.

        * toplev.c (flag_exceptions): Default to 0.
        (compile_file): Remove flag_exceptions == 2 hack.
        (main): Call lang_init_options.
        * tree.h: Declare it.
        * c-lang.c: Implement it.
        * objc/objc-act.c: Likewise.

From-SVN: r20274

gcc/ChangeLog

+Sun Jun  7 14:02:58 1998  Richard Henderson  <rth@cygnus.com>
+
+	* toplev.c (flag_exceptions): Default to 0.
+	(compile_file): Remove flag_exceptions == 2 hack.
+	(main): Call lang_init_options.
+	* tree.h: Declare it.
+	* c-lang.c: Implement it.
+	* objc/objc-act.c: Likewise.
+	
 Sun Jun  7 12:27:30 1998  David Edelsohn  <edelsohn@mhpcc.edu>
 
 	* rs6000.md (restore_stack_block): Generate MEM and specify mode.
@@ -1945,7 +1954,7 @@ Sun May  3 23:57:25 1998  Robert Lipe   <robertl@dgii.com>
 	(xm_defines): Add USG so dbxout will build.
 	* configure: Regenerate.
 
-Sun May  3 13:51:34 PDT 1998  Richard Henerson  <rth@cygnus.com>
+Sun May  3 13:51:34 PDT 1998  Richard Henderson  <rth@cygnus.com>
 
 	Support for official Sparc V9 ABI:
 	* sparc.c (sparc_override_options): Force stack bias off for !arch64.

gcc/LANGUAGES

@@ -6,6 +6,10 @@ time as we can formally start documenting the interface this file will
 serve as a repository for information on these interface and any incompatable
 changes we've made.
 
+Jun  7, 1998:
+  Front-ends must now define lang_init_options.  It is safe for this
+  function to do nothing.  See c-lang.c.
+
 Apr 21, 1998:
   Front ends which link with c-common or other files from the C/C++
   front-ends may need to handle TI types.  Look for references to

gcc/c-lang.c

@@ -38,6 +38,11 @@ lang_decode_option (p)
 }
 
 void
+lang_init_options ()
+{
+}
+
+void
 lang_init ()
 {
 #if !USE_CPPLIB

gcc/objc/objc-act.c

@@ -581,6 +581,11 @@ generate_struct_by_value_array ()
 }
 
 void
+lang_init_options ()
+{
+}
+
+void
 lang_init ()
 {
 #if !USE_CPPLIB

gcc/toplev.c

@@ -598,7 +598,7 @@ int flag_pic;
 /* Nonzero means generate extra code for exception handling and enable
    exception handling.  */
 
-int flag_exceptions = 2;
+int flag_exceptions;
 
 /* Nonzero means don't place uninitialized global data in common storage
    by default.  */
@@ -2416,32 +2416,10 @@ compile_file (name)
   input_file_stack->next = 0;
   input_file_stack->name = input_filename;
 
-  /* Gross. Gross.  lang_init is (I think) the first callback into
-     the language front end, and is thus the first opportunity to
-     have the selected language override the default value for any
-     -f option.
-
-     So the default value for flag_exceptions is 2 (uninitialized).
-     If we encounter -fno-exceptions or -fexceptions, then flag_exceptions
-     will be set to zero or one respectively.
-
-     flag_exceptions can also be set by lang_init to something other
-     than the default "uninitialized" value of 2.
-
-     After lang_init, if the value is still 2, then we default to
-     -fno-exceptions (value will be reset to zero).
-
-     When our EH mechanism is low enough overhead that we can enable
-     it by default for languages other than C++, then all this braindamage
-     will go away.  */
-  
   /* Perform language-specific initialization.
      This may set main_input_filename.  */
   lang_init ();
 
-  if (flag_exceptions == 2)
-    flag_exceptions = 0;
-     
   /* If the input doesn't start with a #line, use the input name
      as the official input file name.  */
   if (main_input_filename == 0)
@@ -3775,6 +3753,9 @@ main (argc, argv, envp)
   flag_short_enums = DEFAULT_SHORT_ENUMS;
 #endif
 
+  /* Perform language-specific options intialization.  */
+  lang_init_options ();
+
   /* Scan to see what optimization level has been specified.  That will
      determine the default value of many flags.  */
   for (i = 1; i < argc; i++)

gcc/tree.h

@@ -1942,6 +1942,9 @@ extern void dwarf2out_end_epilogue	PROTO((void));
 
 /* The language front-end must define these functions.  */
 
+/* Function of no arguments for initializing options.  */
+extern void lang_init_options			PROTO((void));
+
 /* Function of no arguments for initializing lexical scanning.  */
 extern void init_lex				PROTO((void));
 /* Function of no arguments for initializing the symbol table.  */