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* [Bug c++/52987] New: bogus expected ; before for undeclared type
@ 2012-04-14 15:23 manu at gcc dot gnu.org
2012-04-24 4:24 ` [Bug c++/52987] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: manu at gcc dot gnu.org @ 2012-04-14 15:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52987
Bug #: 52987
Summary: bogus expected ; before for undeclared type
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: manu@gcc.gnu.org
void foo(void) {
x var;
}
manuel@gcc12:~/test2$ ~/trunk/186353/build/gcc/cc1plus ~/notdeclared.c
void foo()
/home/manuel/notdeclared.c:2:3: error: ‘x’ was not declared in this scope
x var;
^
/home/manuel/notdeclared.c:2:5: error: expected ‘;’ before ‘var’
x var;
^
manuel@gcc12:~/test2$ clang ~/notdeclared.c
/home/manuel/notdeclared.c:2:3: error: use of undeclared identifier 'x'
x var;
^
1 error generated.
The "expected ";" before "var"" is bogus.
The following patch removes it in this case:
--- gcc/cp/parser.c (revision 186353)
+++ gcc/cp/parser.c (working copy)
@@ -5589,13 +5589,19 @@ cp_parser_postfix_expression (cp_parser
while (true)
{
if (idk == CP_ID_KIND_UNQUALIFIED
&& TREE_CODE (postfix_expression) == IDENTIFIER_NODE
&& cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_PAREN))
- /* It is not a Koenig lookup function call. */
- postfix_expression
- = unqualified_name_lookup_error (postfix_expression);
+ {
+ /* It is not a Koenig lookup function call. */
+ postfix_expression =
+ unqualified_name_lookup_error (postfix_expression);
+ /* It is better to skip the rest and return here, because at
+ this point we don't know what this statement is. */
+ cp_parser_skip_to_end_of_statement (parser);
+ return error_mark_node;
+ }
/* Peek at the next token. */
token = cp_lexer_peek_token (parser->lexer);
switch (token->type)
Unfortunately, undeclared names can occur in many places besides statements, so
it fails for things like:
int foo(x var) {
}
I couldn't figure out how tell the context where we are called. :-(
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/52987] bogus expected ; before for undeclared type
2012-04-14 15:23 [Bug c++/52987] New: bogus expected ; before for undeclared type manu at gcc dot gnu.org
@ 2012-04-24 4:24 ` pinskia at gcc dot gnu.org
2013-07-11 9:49 ` paolo.carlini at oracle dot com
2015-07-23 10:12 ` paolo at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2012-04-24 4:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52987
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-04-24
Ever Confirmed|0 |1
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-04-24 04:23:33 UTC ---
Confirmed. The C front-end handles this much better:
t.c: In function ‘foo’:
t.c:2:3: error: unknown type name ‘x’
x var;
^
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/52987] bogus expected ; before for undeclared type
2012-04-14 15:23 [Bug c++/52987] New: bogus expected ; before for undeclared type manu at gcc dot gnu.org
2012-04-24 4:24 ` [Bug c++/52987] " pinskia at gcc dot gnu.org
@ 2013-07-11 9:49 ` paolo.carlini at oracle dot com
2015-07-23 10:12 ` paolo at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-07-11 9:49 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52987
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
The first half is fixed for 4.9.0 (r200150).
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/52987] bogus expected ; before for undeclared type
2012-04-14 15:23 [Bug c++/52987] New: bogus expected ; before for undeclared type manu at gcc dot gnu.org
2012-04-24 4:24 ` [Bug c++/52987] " pinskia at gcc dot gnu.org
2013-07-11 9:49 ` paolo.carlini at oracle dot com
@ 2015-07-23 10:12 ` paolo at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: paolo at gcc dot gnu.org @ 2015-07-23 10:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52987
--- Comment #3 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Thu Jul 23 10:11:48 2015
New Revision: 226097
URL: https://gcc.gnu.org/viewcvs?rev=226097&root=gcc&view=rev
Log:
/cp
2015-07-23 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/52987
* parser.c (cp_parser_simple_declaration): Robustify check avoiding
redundant error messages.
/testsuite
2015-07-23 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/52987
* g++.dg/parse/error57.C: New.
* g++.dg/expr/string-2.C: Update.
Added:
trunk/gcc/testsuite/g++.dg/parse/error57.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/expr/string-2.C
^ permalink raw reply [flat|nested] 4+ messages in thread
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2012-04-14 15:23 [Bug c++/52987] New: bogus expected ; before for undeclared type manu at gcc dot gnu.org
2012-04-24 4:24 ` [Bug c++/52987] " pinskia at gcc dot gnu.org
2013-07-11 9:49 ` paolo.carlini at oracle dot com
2015-07-23 10:12 ` paolo at gcc dot gnu.org
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