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toplev.c (flag_exceptions): Default value is 2.

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* toplev.c (flag_exceptions): Default value is 2.
        (compile_file): If flag_exceptions still has the value 2, then
        set it to 0.

        * lex.c (lang_init): Enable flag_exceptions by default if no
        command line switch was specified.
Gross hacks to allow front-ends to override -fexceptions.

From-SVN: r16152
This commit is contained in:
Jeffrey A Law 1997-10-23 01:29:14 +00:00 committed by Jeff Law
parent 1181d2d553
commit 56bf1fd97a
4 changed files with 36 additions and 1 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
Wed Oct 22 00:34:12 1997 Jeffrey A Law (law@cygnus.com)
* toplev.c (flag_exceptions): Default value is 2.
(compile_file): If flag_exceptions still has the value 2, then
set it to 0.
* rs6000.c (struct machine_function): Add pic_offset_table_rtx.
(rs6000_save_machine_status): Save pic_offset_table_rtx.
(rs6000_restore_machine_status: Restore pic_offset_table_rtx.

5
gcc/cp/ChangeLog.egcs
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@ -1,3 +1,8 @@
Wed Oct 22 18:56:31 1997 Jeffrey A Law (law@cygnus.com)
* lex.c (lang_init): Enable flag_exceptions by default if no
command line switch was specified.
Wed Sep 10 16:39:26 1997 Jim Wilson <wilson@cygnus.com>
* Make-lang.in (LN, LN_S): New macros, use where appropriate.

4
gcc/cp/lex.c
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@ -387,6 +387,10 @@ lang_init ()
put_back (check_newline ());
if (flag_gnu_xref) GNU_xref_begin (input_filename);
init_repo (input_filename);
/* See comments in toplev.c before the call to lang_init. */
if (flag_exceptions == 2)
flag_exceptions = 1;
}
void

24
gcc/toplev.c
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@ -551,7 +551,7 @@ int flag_pic;
/* Nonzero means generate extra code for exception handling and enable
exception handling. */
int flag_exceptions = 1;
int flag_exceptions = 2;
/* Nonzero means don't place uninitialized global data in common storage
by default. */
@ -2361,10 +2361,32 @@ 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)