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re PR c/51849 (-Wc99-compat would be considered useful) 

PR c/51849
gcc/
	* gcc/doc/invoke.texi: Document -Wc90-c99-compat.
gcc/c-family/
	* c-opts.c (sanitize_cpp_opts): Pass warn_c90_c99_compat to libcpp.
	* c.opt (Wc90-c99-compat): Add option.
gcc/c/
	* c-decl.c (build_array_declarator): Remove check for !flag_isoc99.
	Call pedwarn_c90 instead of pedwarn.
	(check_bitfield_type_and_width): Likewise.
	(declspecs_add_qual): Likewise.
	(declspecs_add_type): Likewise.
	(warn_variable_length_array): Unify function for -pedantic and -Wvla.
	Adjust to only call pedwarn_c90.
	(grokdeclarator): Remove pedantic && !flag_isoc99 check.  Call
	pedwarn_c90 instead of pedwarn.
	* c-errors.c (pedwarn_c90): Handle -Wc90-c99-compat.
	* c-parser.c (disable_extension_diagnostics): Handle
	warn_c90_c99_compat.
	(restore_extension_diagnostics): Likewise.
	(c_parser_enum_specifier): Remove check for !flag_isoc99.  Call
	pedwarn_c90 instead of pedwarn.
	(c_parser_initelt): Likewise.
	(c_parser_postfix_expression): Likewise.
	(c_parser_postfix_expression_after_paren_type): Likewise.
	(c_parser_compound_statement_nostart): Remove check for !flag_isoc99.
	* c-tree.h: Fix formatting.
	* c-typeck.c (build_array_ref): Remove check for !flag_isoc99.  Call
	pedwarn_c90 instead of pedwarn.
gcc/testsuite/
	* gcc.dg/Wc90-c99-compat-1.c: New test.
	* gcc.dg/Wc90-c99-compat-2.c: New test.
	* gcc.dg/Wc90-c99-compat-3.c: New test.
	* gcc.dg/Wc90-c99-compat-4.c: New test.
	* gcc.dg/Wc90-c99-compat-5.c: New test.
	* gcc.dg/Wc90-c99-compat-6.c: New test.
	* gcc.dg/wvla-1.c: Adjust dg-warning.
	* gcc.dg/wvla-2.c: Adjust dg-warning.
	* gcc.dg/wvla-4.c: Adjust dg-warning.
	* gcc.dg/wvla-6.c: Adjust dg-warning.
libcpp/
	* lex.c (_cpp_lex_direct): Warn when -Wc90-c99-compat is in effect.
	* charset.c (_cpp_valid_ucn): Likewise.
	* include/cpplib.h (cpp_options): Add cpp_warn_c90_c99_compat.
	* macro.c (replace_args): Warn when -Wc90-c99-compat is in effect.
	(parse_params): Likewise.

From-SVN: r213786
This commit is contained in:
Marek Polacek 2014-08-10 06:10:49 +00:00 committed by Marek Polacek
parent 7a9f1eed30
commit f3bede7188
27 changed files with 511 additions and 109 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2014-08-10 Marek Polacek <polacek@redhat.com>
PR c/51849
* gcc/doc/invoke.texi: Document -Wc90-c99-compat.
2014-08-09 Jan Hubicka <hubicka@ucw.cz>
* ipa-devirt.c (get_dynamic_type): Handle case when instance is in

6
gcc/c-family/ChangeLog
View File

@ -1,3 +1,9 @@
2014-08-10 Marek Polacek <polacek@redhat.com>
PR c/51849
* c-opts.c (sanitize_cpp_opts): Pass warn_c90_c99_compat to libcpp.
* c.opt (Wc90-c99-compat): Add option.
2014-08-07 Trevor Saunders <tsaunders@mozilla.com>
* c-gimplify.c, cilk.c: Remove includes of pointer-set.h.

1
gcc/c-family/c-opts.c
View File

@ -1295,6 +1295,7 @@ sanitize_cpp_opts (void)
cpp_opts->unsigned_char = !flag_signed_char;
cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
cpp_opts->warn_date_time = cpp_warn_date_time;
cpp_opts->cpp_warn_c90_c99_compat = warn_c90_c99_compat;
/* Wlong-long is disabled by default. It is enabled by:
[-Wpedantic | -Wtraditional] -std=[gnu|c]++98 ; or

4
gcc/c-family/c.opt
View File

@ -291,6 +291,10 @@ Wbuiltin-macro-redefined
C ObjC C++ ObjC++ Warning
Warn when a built-in preprocessor macro is undefined or redefined
Wc90-c99-compat
C ObjC Var(warn_c90_c99_compat) Warning
Warn about features not present in ISO C90, but present in ISO C99
Wc++-compat
C ObjC Var(warn_cxx_compat) Warning
Warn about C constructs that are not in the common subset of C and C++

26
gcc/c/ChangeLog
View File

@ -1,3 +1,29 @@
2014-08-10 Marek Polacek <polacek@redhat.com>
PR c/51849
* c-decl.c (build_array_declarator): Remove check for !flag_isoc99.
Call pedwarn_c90 instead of pedwarn.
(check_bitfield_type_and_width): Likewise.
(declspecs_add_qual): Likewise.
(declspecs_add_type): Likewise.
(warn_variable_length_array): Unify function for -pedantic and -Wvla.
Adjust to only call pedwarn_c90.
(grokdeclarator): Remove pedantic && !flag_isoc99 check. Call
pedwarn_c90 instead of pedwarn.
* c-errors.c (pedwarn_c90): Handle -Wc90-c99-compat.
* c-parser.c (disable_extension_diagnostics): Handle
warn_c90_c99_compat.
(restore_extension_diagnostics): Likewise.
(c_parser_enum_specifier): Remove check for !flag_isoc99. Call
pedwarn_c90 instead of pedwarn.
(c_parser_initelt): Likewise.
(c_parser_postfix_expression): Likewise.
(c_parser_postfix_expression_after_paren_type): Likewise.
(c_parser_compound_statement_nostart): Remove check for !flag_isoc99.
* c-tree.h: Fix formatting.
* c-typeck.c (build_array_ref): Remove check for !flag_isoc99. Call
pedwarn_c90 instead of pedwarn.
2014-08-07 Trevor Saunders <tsaunders@mozilla.com>
* c-typeck.c: Remove include of pointer-set.h.

112
gcc/c/c-decl.c
View File

@ -3968,16 +3968,13 @@ build_array_declarator (location_t loc,
}
declarator->u.array.static_p = static_p;
declarator->u.array.vla_unspec_p = vla_unspec_p;
if (!flag_isoc99)
{
if (static_p || quals != NULL)
pedwarn (loc, OPT_Wpedantic,
if (static_p || quals != NULL)
pedwarn_c90 (loc, OPT_Wpedantic,
"ISO C90 does not support %<static%> or type "
"qualifiers in parameter array declarators");
if (vla_unspec_p)
pedwarn (loc, OPT_Wpedantic,
if (vla_unspec_p)
pedwarn_c90 (loc, OPT_Wpedantic,
"ISO C90 does not support %<[*]%> array declarators");
}
if (vla_unspec_p)
{
if (!current_scope->parm_flag)
@ -4891,10 +4888,9 @@ check_bitfield_type_and_width (tree *type, tree *width, tree orig_name)
if (!in_system_header_at (input_location)
&& type_mv != integer_type_node
&& type_mv != unsigned_type_node
&& type_mv != boolean_type_node
&& !flag_isoc99)
pedwarn (input_location, OPT_Wpedantic,
"type of bit-field %qs is a GCC extension", name);
&& type_mv != boolean_type_node)
pedwarn_c90 (input_location, OPT_Wpedantic,
"type of bit-field %qs is a GCC extension", name);
max_width = TYPE_PRECISION (*type);
@ -4925,52 +4921,27 @@ static void
warn_variable_length_array (tree name, tree size)
{
int const_size = TREE_CONSTANT (size);
enum opt_code opt = (warn_vla == -1 && !warn_c90_c99_compat)
? OPT_Wpedantic : OPT_Wvla;
if (!flag_isoc99 && pedantic && warn_vla != 0)
if (const_size)
{
if (const_size)
{
if (name)
pedwarn (input_location, OPT_Wvla,
if (name)
pedwarn_c90 (input_location, opt,
"ISO C90 forbids array %qE whose size "
"can%'t be evaluated",
name);
else
pedwarn (input_location, OPT_Wvla, "ISO C90 forbids array whose size "
"can%'t be evaluated");
}
"can%'t be evaluated", name);
else
{
if (name)
pedwarn (input_location, OPT_Wvla,
"ISO C90 forbids variable length array %qE",
name);
else
pedwarn (input_location, OPT_Wvla, "ISO C90 forbids variable length array");
}
pedwarn_c90 (input_location, opt, "ISO C90 forbids array "
"whose size can%'t be evaluated");
}
else if (warn_vla > 0)
else
{
if (const_size)
{
if (name)
warning (OPT_Wvla,
"the size of array %qE can"
"%'t be evaluated", name);
else
warning (OPT_Wvla,
"the size of array can %'t be evaluated");
}
if (name)
pedwarn_c90 (input_location, opt,
"ISO C90 forbids variable length array %qE", name);
else
{
if (name)
warning (OPT_Wvla,
"variable length array %qE is used",
name);
else
warning (OPT_Wvla,
"variable length array is used");
}
pedwarn_c90 (input_location, opt, "ISO C90 forbids variable "
"length array");
}
}
@ -5186,18 +5157,14 @@ grokdeclarator (const struct c_declarator *declarator,
as2 = TYPE_ADDR_SPACE (element_type);
address_space = ADDR_SPACE_GENERIC_P (as1)? as2 : as1;
if (pedantic && !flag_isoc99)
{
if (constp > 1)
pedwarn (loc, OPT_Wpedantic, "duplicate %<const%>");
if (restrictp > 1)
pedwarn (loc, OPT_Wpedantic, "duplicate %<restrict%>");
if (volatilep > 1)
pedwarn (loc, OPT_Wpedantic, "duplicate %<volatile%>");
if (atomicp > 1)
pedwarn (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
}
if (constp > 1)
pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<const%>");
if (restrictp > 1)
pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<restrict%>");
if (volatilep > 1)
pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<volatile%>");
if (atomicp > 1)
pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %<_Atomic%>");
if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) && as1 != as2)
error_at (loc, "conflicting named address spaces (%s vs %s)",
@ -5602,10 +5569,9 @@ grokdeclarator (const struct c_declarator *declarator,
flexible_array_member = (t->kind == cdk_id);
}
if (flexible_array_member
&& pedantic && !flag_isoc99
&& !in_system_header_at (input_location))
pedwarn (loc, OPT_Wpedantic,
"ISO C90 does not support flexible array members");
pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not "
"support flexible array members");
/* ISO C99 Flexible array members are effectively
identical to GCC's zero-length array extension. */
@ -9136,8 +9102,8 @@ declspecs_add_qual (source_location loc,
default:
gcc_unreachable ();
}
if (dupe && !flag_isoc99)
pedwarn (loc, OPT_Wpedantic, "duplicate %qE", qual);
if (dupe)
pedwarn_c90 (loc, OPT_Wpedantic, "duplicate %qE", qual);
return specs;
}
@ -9381,9 +9347,9 @@ declspecs_add_type (location_t loc, struct c_declspecs *specs,
break;
case RID_COMPLEX:
dupe = specs->complex_p;
if (!flag_isoc99 && !in_system_header_at (loc))
pedwarn (loc, OPT_Wpedantic,
"ISO C90 does not support complex types");
if (!in_system_header_at (loc))
pedwarn_c90 (loc, OPT_Wpedantic,
"ISO C90 does not support complex types");
if (specs->typespec_word == cts_auto_type)
error_at (loc,
("both %<complex%> and %<__auto_type%> in "
@ -9599,9 +9565,9 @@ declspecs_add_type (location_t loc, struct c_declspecs *specs,
}
return specs;
case RID_BOOL:
if (!flag_isoc99 && !in_system_header_at (loc))
pedwarn (loc, OPT_Wpedantic,
"ISO C90 does not support boolean types");
if (!in_system_header_at (loc))
pedwarn_c90 (loc, OPT_Wpedantic,
"ISO C90 does not support boolean types");
if (specs->long_p)
error_at (loc,
("both %<long%> and %<_Bool%> in "

33
gcc/c/c-errors.c
View File

@ -44,21 +44,38 @@ pedwarn_c99 (location_t location, int opt, const char *gmsgid, ...)
va_end (ap);
}
/* Issue an ISO C90 pedantic warning MSGID. This function is supposed to
be used for matters that are allowed in ISO C99 but not supported in
ISO C90, thus we explicitly don't pedwarn when C99 is specified.
(There is no flag_c90.) */
/* Issue an ISO C90 pedantic warning MSGID if -pedantic outside C99 mode,
otherwise issue warning MSGID if -Wc90-c99-compat is specified, or if
a specific option such as -Wlong-long is specified.
This function is supposed to be used for matters that are allowed in
ISO C99 but not supported in ISO C90, thus we explicitly don't pedwarn
when C99 is specified. (There is no flag_c90.) */
void
pedwarn_c90 (location_t location, int opt, const char *gmsgid, ...)
{
diagnostic_info diagnostic;
va_list ap;
bool warned = false;
va_start (ap, gmsgid);
diagnostic_set_info (&diagnostic, gmsgid, &ap, location,
flag_isoc99 ? DK_WARNING : DK_PEDWARN);
diagnostic.option_index = opt;
report_diagnostic (&diagnostic);
if (pedantic && !flag_isoc99)
{
diagnostic_set_info (&diagnostic, gmsgid, &ap, location, DK_PEDWARN);
diagnostic.option_index = opt;
warned = report_diagnostic (&diagnostic);
}
else if (opt != OPT_Wpedantic)
{
diagnostic_set_info (&diagnostic, gmsgid, &ap, location, DK_WARNING);
diagnostic.option_index = opt;
warned = report_diagnostic (&diagnostic);
}
if (warn_c90_c99_compat && !warned)
{
diagnostic_set_info (&diagnostic, gmsgid, &ap, location, DK_WARNING);
diagnostic.option_index = OPT_Wc90_c99_compat;
report_diagnostic (&diagnostic);
}
va_end (ap);
}

35
gcc/c/c-parser.c
View File

@ -1072,7 +1072,8 @@ disable_extension_diagnostics (void)
| (flag_iso << 3)
| (warn_long_long << 4)
| (warn_cxx_compat << 5)
| (warn_overlength_strings << 6));
| (warn_overlength_strings << 6)
| (warn_c90_c99_compat << 7));
cpp_opts->cpp_pedantic = pedantic = 0;
warn_pointer_arith = 0;
cpp_opts->cpp_warn_traditional = warn_traditional = 0;
@ -1080,6 +1081,7 @@ disable_extension_diagnostics (void)
cpp_opts->cpp_warn_long_long = warn_long_long = 0;
warn_cxx_compat = 0;
warn_overlength_strings = 0;
warn_c90_c99_compat = 0;
return ret;
}
@ -1096,6 +1098,7 @@ restore_extension_diagnostics (int flags)
cpp_opts->cpp_warn_long_long = warn_long_long = (flags >> 4) & 1;
warn_cxx_compat = (flags >> 5) & 1;
warn_overlength_strings = (flags >> 6) & 1;
warn_c90_c99_compat = (flags >> 7) & 1;
}
/* Possibly kinds of declarator to parse. */
@ -2545,8 +2548,9 @@ c_parser_enum_specifier (c_parser *parser)
}
if (c_parser_next_token_is (parser, CPP_CLOSE_BRACE))
{
if (seen_comma && !flag_isoc99)
pedwarn (comma_loc, OPT_Wpedantic, "comma at end of enumerator list");
if (seen_comma)
pedwarn_c90 (comma_loc, OPT_Wpedantic,
"comma at end of enumerator list");
c_parser_consume_token (parser);
break;
}
@ -4348,9 +4352,9 @@ c_parser_initelt (c_parser *parser, struct obstack * braced_init_obstack)
{
if (c_parser_next_token_is (parser, CPP_EQ))
{
if (!flag_isoc99)
pedwarn (des_loc, OPT_Wpedantic,
"ISO C90 forbids specifying subobject to initialize");
pedwarn_c90 (des_loc, OPT_Wpedantic,
"ISO C90 forbids specifying subobject "
"to initialize");
c_parser_consume_token (parser);
}
else
@ -4566,10 +4570,9 @@ c_parser_compound_statement_nostart (c_parser *parser)
c_parser_declaration_or_fndef (parser, true, true, true, true,
true, NULL, vNULL);
if (last_stmt)
pedwarn_c90 (loc,
(pedantic && !flag_isoc99)
? OPT_Wpedantic
: OPT_Wdeclaration_after_statement,
pedwarn_c90 (loc, (pedantic && !flag_isoc99)
? OPT_Wpedantic
: OPT_Wdeclaration_after_statement,
"ISO C90 forbids mixed declarations and code");
last_stmt = false;
}
@ -4598,8 +4601,8 @@ c_parser_compound_statement_nostart (c_parser *parser)
restore_extension_diagnostics (ext);
if (last_stmt)
pedwarn_c90 (loc, (pedantic && !flag_isoc99)
? OPT_Wpedantic
: OPT_Wdeclaration_after_statement,
? OPT_Wpedantic
: OPT_Wdeclaration_after_statement,
"ISO C90 forbids mixed declarations and code");
last_stmt = false;
}
@ -7401,9 +7404,8 @@ c_parser_postfix_expression (c_parser *parser)
expr.value = error_mark_node;
break;
}
if (!flag_isoc99)
pedwarn (loc, OPT_Wpedantic,
"ISO C90 does not support complex types");
pedwarn_c90 (loc, OPT_Wpedantic,
"ISO C90 does not support complex types");
expr.value = build2 (COMPLEX_EXPR,
build_complex_type
(TYPE_MAIN_VARIANT
@ -7607,8 +7609,7 @@ c_parser_postfix_expression_after_paren_type (c_parser *parser,
type = error_mark_node;
}
if (!flag_isoc99)
pedwarn (start_loc, OPT_Wpedantic, "ISO C90 forbids compound literals");
pedwarn_c90 (start_loc, OPT_Wpedantic, "ISO C90 forbids compound literals");
non_const = ((init.value && TREE_CODE (init.value) == CONSTRUCTOR)
? CONSTRUCTOR_NON_CONST (init.value)
: init.original_code == C_MAYBE_CONST_EXPR);

6
gcc/c/c-tree.h
View File

@ -676,7 +676,9 @@ extern tree c_omp_reduction_lookup (tree, tree);
extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
/* In c-errors.c */
extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
extern void pedwarn_c90 (location_t, int opt, const char *, ...)
ATTRIBUTE_GCC_DIAG(3,4);
extern void pedwarn_c99 (location_t, int opt, const char *, ...)
ATTRIBUTE_GCC_DIAG(3,4);
#endif /* ! GCC_C_TREE_H */

9
gcc/c/c-typeck.c
View File

@ -2510,7 +2510,7 @@ build_array_ref (location_t loc, tree array, tree index)
return error_mark_node;
}
if (pedantic)
if (pedantic || warn_c90_c99_compat)
{
tree foo = array;
while (TREE_CODE (foo) == COMPONENT_REF)
@ -2518,9 +2518,10 @@ build_array_ref (location_t loc, tree array, tree index)
if (TREE_CODE (foo) == VAR_DECL && C_DECL_REGISTER (foo))
pedwarn (loc, OPT_Wpedantic,
"ISO C forbids subscripting %<register%> array");
else if (!flag_isoc99 && !lvalue_p (foo))
pedwarn (loc, OPT_Wpedantic,
"ISO C90 forbids subscripting non-lvalue array");
else if (!lvalue_p (foo))
pedwarn_c90 (loc, OPT_Wpedantic,
"ISO C90 forbids subscripting non-lvalue "
"array");
}
type = TREE_TYPE (TREE_TYPE (array));

10
gcc/doc/invoke.texi
View File

@ -241,6 +241,7 @@ Objective-C and Objective-C++ Dialects}.
-w -Wextra -Wall -Waddress -Waggregate-return @gol
-Waggressive-loop-optimizations -Warray-bounds @gol
-Wno-attributes -Wno-builtin-macro-redefined @gol
-Wc90-c99-compat @gol
-Wc++-compat -Wc++11-compat -Wcast-align -Wcast-qual @gol
-Wchar-subscripts -Wclobbered -Wcomment -Wconditionally-supported @gol
-Wconversion -Wcoverage-mismatch -Wdate-time -Wdelete-incomplete -Wno-cpp @gol
@ -4517,6 +4518,15 @@ example, warn if an unsigned variable is compared against zero with
Warn whenever a function call is cast to a non-matching type.
For example, warn if @code{int malloc()} is cast to @code{anything *}.
@item -Wc90-c99-compat @r{(C and Objective-C only)}
@opindex Wc90-c99-compat
@opindex Wno-c90-c99-compat
Warn about features not present in ISO C90, but present in ISO C99.
For instance, warn about use of variable length arrays, @code{long long}
type, @code{bool} type, compound literals, designated initializers, and so
on. This option is independent of the standards mode. Warnings are disabled
in the expression that follows @code{__extension__}.
@item -Wc++-compat @r{(C and Objective-C only)}
Warn about ISO C constructs that are outside of the common subset of
ISO C and ISO C++, e.g.@: request for implicit conversion from

14
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,17 @@
2014-08-10 Marek Polacek <polacek@redhat.com>
PR c/51849
* gcc.dg/Wc90-c99-compat-1.c: New test.
* gcc.dg/Wc90-c99-compat-2.c: New test.
* gcc.dg/Wc90-c99-compat-3.c: New test.
* gcc.dg/Wc90-c99-compat-4.c: New test.
* gcc.dg/Wc90-c99-compat-5.c: New test.
* gcc.dg/Wc90-c99-compat-6.c: New test.
* gcc.dg/wvla-1.c: Adjust dg-warning.
* gcc.dg/wvla-2.c: Adjust dg-warning.
* gcc.dg/wvla-4.c: Adjust dg-warning.
* gcc.dg/wvla-6.c: Adjust dg-warning.
2014-08-10 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/61999

56
gcc/testsuite/gcc.dg/Wc90-c99-compat-1.c Normal file
View File

@ -0,0 +1,56 @@
/* { dg-do compile } */
/* { dg-options "-std=gnu90 -Wpedantic -Wc90-c99-compat" } */
_Bool b; /* { dg-warning "ISO C90 does not support boolean types" } */
_Complex double c = __builtin_complex (0.0, 0.0); /* { dg-warning "ISO C90 does not support complex types" } */
long long l; /* { dg-warning "ISO C90 does not support .long long." } */
struct A { int i; char a[]; }; /* { dg-warning "ISO C90 does not support flexible array members" } */
struct { long int b: 2; } s; /* { dg-warning "type of bit-field .b. is a GCC extension" } */
const const int i; /* { dg-warning "duplicate .const." } */
volatile volatile v; /* { dg-warning "duplicate .volatile." } */
struct S { int a[2]; };
extern struct S foo (void);
#define V(v, ...) (v, __VA_ARGS) /* { dg-warning "anonymous variadic macros were introduced in C99" } */
enum { E, }; /* { dg-warning "comma at end of enumerator list" } */
void fn1 (char [*]); /* { dg-warning "ISO C90 does not support .\\\[\\\*\\\]. array declarators" } */
void
fn2 (char x[static 4]) /* { dg-warning "ISO C90 does not support .static. or type qualifiers" } */
{
int i = (int) { 1 }; /* { dg-warning "ISO C90 forbids compound literals" } */
struct A a = { .i = 3 }; /* { dg-warning "ISO C90 forbids specifying subobject to initialize" } */
}
void
fn3 (int n)
{
n = 3;
int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn4 (int n)
{
n = 3;
__extension__ int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn5 (void)
{
(foo ()).a[0]; /* { dg-warning "ISO C90 forbids subscripting non-lvalue array" } */
}
#define F(a) a
void
fn6 (void)
{
F(); /* { dg-warning "invoking macro F argument" } */
}
void fn7 (int n, int a[n]); /* { dg-warning "ISO C90 forbids variable length array .a." } */

56
gcc/testsuite/gcc.dg/Wc90-c99-compat-2.c Normal file
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@ -0,0 +1,56 @@
/* { dg-do compile } */
/* { dg-options "-std=gnu99 -Wc90-c99-compat -pedantic-errors" } */
_Bool b; /* { dg-warning "ISO C90 does not support boolean types" } */
_Complex double c = __builtin_complex (0.0, 0.0); /* { dg-warning "ISO C90 does not support complex types" } */
long long l; /* { dg-warning "ISO C90 does not support .long long." } */
struct A { int i; char a[]; }; /* { dg-warning "ISO C90 does not support flexible array members" } */
struct { long int b: 2; } s; /* { dg-warning "type of bit-field .b. is a GCC extension" } */
const const int i; /* { dg-warning "duplicate .const." } */
volatile volatile int v; /* { dg-warning "duplicate .volatile." } */
struct S { int a[2]; };
extern struct S foo (void);
#define V(v, ...) (v, __VA_ARGS) /* { dg-warning "anonymous variadic macros were introduced in C99" } */
enum { E, }; /* { dg-warning "comma at end of enumerator list" } */
void fn1 (char [*]); /* { dg-warning "ISO C90 does not support .\\\[\\\*\\\]. array declarators" } */
void
fn2 (char x[static 4]) /* { dg-warning "ISO C90 does not support .static. or type qualifiers" } */
{
int i = (int) { 1 }; /* { dg-warning "ISO C90 forbids compound literals" } */
struct A a = { .i = 3 }; /* { dg-warning "ISO C90 forbids specifying subobject to initialize" } */
}
void
fn3 (int n)
{
n = 3;
int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn4 (int n)
{
n = 3;
__extension__ int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn5 (void)
{
(foo ()).a[0]; /* { dg-warning "ISO C90 forbids subscripting non-lvalue array" } */
}
#define F(a) a
void
fn6 (void)
{
F(); /* { dg-warning "invoking macro F argument" } */
}
void fn7 (int n, int a[n]); /* { dg-warning "ISO C90 forbids variable length array .a." } */

56
gcc/testsuite/gcc.dg/Wc90-c99-compat-3.c Normal file
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@ -0,0 +1,56 @@
/* { dg-do compile } */
/* { dg-options "-std=gnu11 -Wc90-c99-compat -pedantic-errors" } */
_Bool b; /* { dg-warning "ISO C90 does not support boolean types" } */
_Complex double c = __builtin_complex (0.0, 0.0); /* { dg-warning "ISO C90 does not support complex types" } */
long long l; /* { dg-warning "ISO C90 does not support .long long." } */
struct A { int i; char a[]; }; /* { dg-warning "ISO C90 does not support flexible array members" } */
struct { long int b: 2; } s; /* { dg-warning "type of bit-field .b. is a GCC extension" } */
const const int i; /* { dg-warning "duplicate .const." } */
volatile volatile int v; /* { dg-warning "duplicate .volatile." } */
struct S { int a[2]; };
extern struct S foo (void);
#define V(v, ...) (v, __VA_ARGS) /* { dg-warning "anonymous variadic macros were introduced in C99" } */
enum { E, }; /* { dg-warning "comma at end of enumerator list" } */
void fn1 (char [*]); /* { dg-warning "ISO C90 does not support .\\\[\\\*\\\]. array declarators" } */
void
fn2 (char x[static 4]) /* { dg-warning "ISO C90 does not support .static. or type qualifiers" } */
{
int i = (int) { 1 }; /* { dg-warning "ISO C90 forbids compound literals" } */
struct A a = { .i = 3 }; /* { dg-warning "ISO C90 forbids specifying subobject to initialize" } */
}
void
fn3 (int n)
{
n = 3;
int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn4 (int n)
{
n = 3;
__extension__ int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn5 (void)
{
(foo ()).a[0]; /* { dg-warning "ISO C90 forbids subscripting non-lvalue array" } */
}
#define F(a) a
void
fn6 (void)
{
F(); /* { dg-warning "invoking macro F argument" } */
}
void fn7 (int n, int a[n]); /* { dg-warning "ISO C90 forbids variable length array .a." } */

56
gcc/testsuite/gcc.dg/Wc90-c99-compat-4.c Normal file
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@ -0,0 +1,56 @@
/* { dg-do compile } */
/* { dg-options "-std=gnu90 -Wpedantic -Wno-c90-c99-compat" } */
_Bool b; /* { dg-warning "ISO C90 does not support boolean types" } */
_Complex double c = __builtin_complex (0.0, 0.0); /* { dg-warning "ISO C90 does not support complex types" } */
long long l; /* { dg-warning "ISO C90 does not support .long long." } */
struct A { int i; char a[]; }; /* { dg-warning "ISO C90 does not support flexible array members" } */
struct { long int b: 2; } s; /* { dg-warning "type of bit-field .b. is a GCC extension" } */
const const int i; /* { dg-warning "duplicate .const." } */
volatile volatile int v; /* { dg-warning "duplicate .volatile." } */
struct S { int a[2]; };
extern struct S foo (void);
#define V(v, ...) (v, __VA_ARGS) /* { dg-warning "anonymous variadic macros were introduced in C99" } */
enum { E, }; /* { dg-warning "comma at end of enumerator list" } */
void fn1 (char [*]); /* { dg-warning "ISO C90 does not support .\\\[\\\*\\\]. array declarators" } */
void
fn2 (char x[static 4]) /* { dg-warning "ISO C90 does not support .static. or type qualifiers" } */
{
int i = (int) { 1 }; /* { dg-warning "ISO C90 forbids compound literals" } */
struct A a = { .i = 3 }; /* { dg-warning "ISO C90 forbids specifying subobject to initialize" } */
}
void
fn3 (int n)
{
n = 3;
int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn4 (int n)
{
n = 3;
__extension__ int i; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
}
void
fn5 (void)
{
(foo ()).a[0]; /* { dg-warning "ISO C90 forbids subscripting non-lvalue array" } */
}
#define F(a) a
void
fn6 (void)
{
F(); /* { dg-warning "invoking macro F argument" } */
}
void fn7 (int n, int a[n]); /* { dg-warning "ISO C90 forbids variable length array .a." } */

56
gcc/testsuite/gcc.dg/Wc90-c99-compat-5.c Normal file
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@ -0,0 +1,56 @@
/* { dg-do compile } */
/* { dg-options "-std=gnu90 -pedantic-errors -Wno-c90-c99-compat" } */
_Bool b; /* { dg-error "ISO C90 does not support boolean types" } */
_Complex double c = __builtin_complex (0.0, 0.0); /* { dg-error "ISO C90 does not support complex types" } */
long long l; /* { dg-error "ISO C90 does not support .long long." } */
struct A { int i; char a[]; }; /* { dg-error "ISO C90 does not support flexible array members" } */
struct { long int b: 2; } s; /* { dg-error "type of bit-field .b. is a GCC extension" } */
const const int i; /* { dg-error "duplicate .const." } */
volatile volatile int v; /* { dg-error "duplicate .volatile." } */
struct S { int a[2]; };
extern struct S foo (void);
#define V(v, ...) (v, __VA_ARGS) /* { dg-error "anonymous variadic macros were introduced in C99" } */
enum { E, }; /* { dg-error "comma at end of enumerator list" } */
void fn1 (char [*]); /* { dg-error "ISO C90 does not support .\\\[\\\*\\\]. array declarators" } */
void
fn2 (char x[static 4]) /* { dg-error "ISO C90 does not support .static. or type qualifiers" } */
{
int i = (int) { 1 }; /* { dg-error "ISO C90 forbids compound literals" } */
struct A a = { .i = 3 }; /* { dg-error "ISO C90 forbids specifying subobject to initialize" } */
}
void
fn3 (int n)
{
n = 3;
int i; /* { dg-error "ISO C90 forbids mixed declarations and code" } */
}
void
fn4 (int n)
{
n = 3;
__extension__ int i; /* { dg-error "ISO C90 forbids mixed declarations and code" } */
}
void
fn5 (void)
{
(foo ()).a[0]; /* { dg-error "ISO C90 forbids subscripting non-lvalue array" } */
}
#define F(a) a
void
fn6 (void)
{
F(); /* { dg-error "invoking macro F argument" } */
}
void fn7 (int n, int a[n]); /* { dg-error "ISO C90 forbids variable length array .a." } */

29
gcc/testsuite/gcc.dg/Wc90-c99-compat-6.c Normal file
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@ -0,0 +1,29 @@
/* { dg-do compile } */
/* { dg-options "-std=gnu90 -Wc90-c99-compat" } */
__extension__ _Bool b;
__extension__ _Complex double c = __builtin_complex (0.0, 0.0);
__extension__ long long l;
__extension__ struct A { int i; char a[]; };
__extension__ struct { long int b: 2; } s;
__extension__ const const int i;
__extension__ volatile volatile int v;
__extension__ struct S { int a[2]; };
extern struct S foo (void);
__extension__ enum { E, };
__extension__ void fn1 (char [*]);
__extension__ void
fn2 (char x[static 4])
{
int i = (int) { 1 };
struct A a = { .i = 3 };
}
__extension__ void
fn5 (void)
{
(foo ()).a[0];
}
__extension__ void fn7 (int n, int a[n]);

2
gcc/testsuite/gcc.dg/wvla-1.c
View File

@ -2,4 +2,4 @@
/* { dg-options "-std=c89 -Wvla" } */
extern void
func (int i, int array[i]); /* { dg-warning "variable length array 'array' is used" } */
func (int i, int array[i]); /* { dg-warning "ISO C90 forbids variable length array 'array'" } */

2
gcc/testsuite/gcc.dg/wvla-2.c
View File

@ -2,4 +2,4 @@
/* { dg-options "-std=c99 -Wvla" } */
extern void
func (int i, int array[i]); /* { dg-warning "variable length array 'array' is used" } */
func (int i, int array[i]); /* { dg-warning "ISO C90 forbids variable length array 'array'" } */

2
gcc/testsuite/gcc.dg/wvla-4.c
View File

@ -2,4 +2,4 @@
/* { dg-options "-pedantic-errors -std=c99 -Wvla" } */
extern void
func (int i, int array[i]); /* { dg-warning "variable length array 'array' is used" } */
func (int i, int array[i]); /* { dg-warning "ISO C90 forbids variable length array 'array'" } */

2
gcc/testsuite/gcc.dg/wvla-6.c
View File

@ -2,4 +2,4 @@
/* { dg-options "-std=c89 -Wvla" } */
extern void
func (int i, int [i]); /* { dg-warning "variable length array is used" } */
func (int i, int [i]); /* { dg-warning "ISO C90 forbids variable length array" } */

9
libcpp/ChangeLog
View File

@ -1,3 +1,12 @@
2014-08-10 Marek Polacek <polacek@redhat.com>
PR c/51849
* lex.c (_cpp_lex_direct): Warn when -Wc90-c99-compat is in effect.
* charset.c (_cpp_valid_ucn): Likewise.
* include/cpplib.h (cpp_options): Add cpp_warn_c90_c99_compat.
* macro.c (replace_args): Warn when -Wc90-c99-compat is in effect.
(parse_params): Likewise.
2014-07-27 Marek Polacek <polacek@redhat.com>
PR c/61861

4
libcpp/charset.c
View File

@ -995,6 +995,10 @@ _cpp_valid_ucn (cpp_reader *pfile, const uchar **pstr,
if (!CPP_OPTION (pfile, cplusplus) && !CPP_OPTION (pfile, c99))
cpp_error (pfile, CPP_DL_WARNING,
"universal character names are only valid in C++ and C99");
else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat)
&& !CPP_OPTION (pfile, cplusplus))
cpp_error (pfile, CPP_DL_WARNING,
"C99's universal character names are incompatible with C90");
else if (CPP_WTRADITIONAL (pfile) && identifier_pos == 0)
cpp_warning (pfile, CPP_W_TRADITIONAL,
"the meaning of '\\%c' is different in traditional C",

3
libcpp/include/cpplib.h
View File

@ -466,6 +466,9 @@ struct cpp_options
/* True if dependencies should be restored from a precompiled header. */
bool restore_pch_deps;
/* True if warn about differences between C90 and C99. */
bool cpp_warn_c90_c99_compat;
/* Dependency generation. */
struct
{

12
libcpp/lex.c
View File

@ -2325,7 +2325,7 @@ _cpp_lex_direct (cpp_reader *pfile)
else if (c == '/' && (CPP_OPTION (pfile, cplusplus_comments)
|| cpp_in_system_header (pfile)))
{
/* Warn about comments only if pedantically GNUC89, and not
/* Warn about comments if pedantically GNUC89, and not
in system headers. */
if (CPP_OPTION (pfile, lang) == CLK_GNUC89 && CPP_PEDANTIC (pfile)
&& ! buffer->warned_cplusplus_comments)
@ -2336,6 +2336,16 @@ _cpp_lex_direct (cpp_reader *pfile)
"(this will be reported only once per input file)");
buffer->warned_cplusplus_comments = 1;
}
/* Or if specifically desired via -Wc90-c99-compat. */
else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat)
&& ! buffer->warned_cplusplus_comments)
{
cpp_error (pfile, CPP_DL_WARNING,
"C++ style comments are are incompatible with C90");
cpp_error (pfile, CPP_DL_WARNING,
"(this will be reported only once per input file)");
buffer->warned_cplusplus_comments = 1;
}
if (skip_line_comment (pfile) && CPP_OPTION (pfile, warn_comments))
cpp_warning (pfile, CPP_W_COMMENTS, "multi-line comment");

14
libcpp/macro.c
View File

@ -1795,6 +1795,16 @@ replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro,
NODE_NAME (node),
src->val.macro_arg.arg_no);
}
else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat)
&& ! macro->syshdr
&& ! cpp_in_system_header (pfile)
&& ! CPP_OPTION (pfile, cplusplus))
cpp_error (pfile, CPP_DL_WARNING,
"invoking macro %s argument %d: "
"empty macro arguments are undefined"
" in ISO C90",
NODE_NAME (node),
src->val.macro_arg.arg_no);
/* Avoid paste on RHS (even case count == 0). */
if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT))
@ -2848,6 +2858,10 @@ parse_params (cpp_reader *pfile, cpp_macro *macro)
(pfile, CPP_W_VARIADIC_MACROS,
"anonymous variadic macros were introduced in C99");
}
else if (CPP_OPTION (pfile, cpp_warn_c90_c99_compat)
&& ! CPP_OPTION (pfile, cplusplus))
cpp_error (pfile, CPP_DL_WARNING,
"anonymous variadic macros were introduced in C99");
}
else if (CPP_OPTION (pfile, cpp_pedantic)
&& CPP_OPTION (pfile, warn_variadic_macros))