/* RUN: %clang_cc1 -std=c89 -fsyntax-only -verify=expected,c89only -pedantic -Wno-c11-extensions %s
RUN: %clang_cc1 -std=c99 -fsyntax-only -verify=expected,c99untilc2x -pedantic -Wno-c11-extensions %s
RUN: %clang_cc1 -std=c11 -fsyntax-only -verify=expected,c99untilc2x -pedantic %s
RUN: %clang_cc1 -std=c17 -fsyntax-only -verify=expected,c99untilc2x -pedantic %s
RUN: %clang_cc1 -std=c2x -fsyntax-only -verify=expected,c2xandup -pedantic %s
*/
/* The following are DRs which do not require tests to demonstrate
* conformance or nonconformance.
*
* WG14 DR100: dup 001
* Defect with the return statement
*
* WG14 DR104: dup 084
* Incomplete tag types in a parameter list
*
* WG14 DR109: yes
* Are undefined values and undefined behavior the same?
*
* WG14 DR110: dup 047
* Formal parameters having array-of-non-object types
*
* WG14 DR117: yes
* Abstract semantics, sequence points, and expression evaluation
*
* WG14 DR121: yes
* Conversions of pointer values to integral types
*
* WG14 DR122: dup 015
* Conversion/widening of bit-fields
*
* WG14 DR125: yes
* Using things declared as 'extern (qualified) void'
*
* WG14 DR127: dup 013
* Composite type of an enumerated type and an integral type
*
* WG14 DR132: dup 109
* Can undefined behavior occur at translation time, or only at run time?
*
* WG14 DR133: yes
* Undefined behavior not previously listed in subclause G2
*
* WG14 DR138: yes
* Is there an allocated storage duration?
*
* WG14 DR139: yes
* Compatibility of complete and incomplete types
*
* WG14 DR146: yes
* Nugatory constraint
*
* WG14 DR147: yes
* Sequence points in library functions
*
* WG14 DR148: yes
* Defining library functions
*
* WG14 DR149: yes
* The term "variable"
*
* WG14 DR154: yes
* Consistency of implementation-defined values
*
* WG14 DR159: yes
* Consistency of the C Standard Defects exist in the way the Standard refers
* to itself
*
* WG14 DR161: yes
* Details of reserved symbols
*
* WG14 DR169: yes
* Trigraphs
*/
/* WG14 DR101: yes
* Type qualifiers and "as if by assignment"
*/
void dr101_callee(const int val);
void dr101_caller(void) {
int val = 1;
dr101_callee(val); /* ok; const qualifier on the parameter doesn't prevent as-if assignment. */
}
/* WG14 DR102: yes
* Tag redeclaration constraints
*/
void dr102(void) {
struct S { int member; }; /* expected-note {{previous definition is here}} */
struct S { int member; }; /* expected-error {{redefinition of 'S'}} */
union U { int member; }; /* expected-note {{previous definition is here}} */
union U { int member; }; /* expected-error {{redefinition of 'U'}} */
enum E { member }; /* expected-note 2{{previous definition is here}} */
enum E { member }; /* expected-error {{redefinition of 'E'}}
expected-error {{redefinition of enumerator 'member'}} */
}
/* WG14 DR103: yes
* Formal parameters of incomplete type
*/
void dr103_1(int arg[]); /* ok, not an incomplete type due to rewrite */
void dr103_2(struct S s) {} /* expected-warning {{declaration of 'struct S' will not be visible outside of this function}}
expected-error {{variable has incomplete type 'struct S'}}
expected-note {{forward declaration of 'struct S'}} */
void dr103_3(struct S s); /* expected-warning {{declaration of 'struct S' will not be visible outside of this function}}
expected-note {{previous declaration is here}} */
void dr103_3(struct S { int a; } s) { } /* expected-warning {{declaration of 'struct S' will not be visible outside of this function}}
expected-error {{conflicting types for 'dr103_3'}} */
void dr103_4(struct S s1, struct S { int a; } s2); /* expected-warning {{declaration of 'struct S' will not be visible outside of this function}} */
/* WG14 DR105: dup 017
* Precedence of requirements on compatible types
*
* NB: This is also Question 3 from DR017.
*/
void dr105(void) {
/* According to C2x 6.7.6.3p14 the return type and parameter types to be
* compatible types, but qualifiers are dropped from the parameter type.
*/
extern void func(int);
extern void func(const int); /* FIXME: this should be pedantically diagnosed. */
extern void other_func(int); /* expected-note {{previous declaration is here}} */
extern void other_func(int *); /* expected-error {{conflicting types for 'other_func'}} */
extern int i; /* expected-note {{previous declaration is here}} */
extern float i; /* expected-error {{redeclaration of 'i' with a different type: 'float' vs 'int'}} */
}
/* WG14 DR106: yes
* When can you dereference a void pointer?
*
* NB: This is a partial duplicate of DR012.
*/
void dr106(void *p, int i) {
/* The behavior changed between C89 and C99. */
(void)&*p; /* c89only-warning {{ISO C forbids taking the address of an expression of type 'void'}}
c89only-warning {{ISO C does not allow indirection on operand of type 'void *'}} */
/* The behavior of all three of these is undefined. */
(void)*p; /* expected-warning {{ISO C does not allow indirection on operand of type 'void *'}}*/
(void)&(*p); /* c89only-warning {{ISO C forbids taking the address of an expression of type 'void'}}
expected-warning {{ISO C does not allow indirection on operand of type 'void *'}}*/
(void)(i ? *p : *p); /* expected-warning {{ISO C does not allow indirection on operand of type 'void *'}}
expected-warning {{ISO C does not allow indirection on operand of type 'void *'}}*/
(void)(*p, *p); /* expected-warning {{left operand of comma operator has no effect}}
expected-warning {{ISO C does not allow indirection on operand of type 'void *'}}
expected-warning {{ISO C does not allow indirection on operand of type 'void *'}}*/
}
/* WG14 DR108: yes
* Can a macro identifier hide a keyword?
*/
void dr108(void) {
#define const
const int i = 12;
#undef const
const int j = 12; /* expected-note {{variable 'j' declared const here}} */
i = 100; /* Okay, the keyword was hidden by the macro. */
j = 100; /* expected-error {{cannot assign to variable 'j' with const-qualified type 'const int'}} */
}
/* WG14 DR111: yes
* Conversion of pointer-to-qualified type values to type (void*) values
*/
void dr111(const char *ccp, void *vp) {
vp = ccp; /* expected-warning {{assigning to 'void *' from 'const char *' discards qualifiers}} */
}
/* WG14 DR112: yes
* Null pointer constants and relational comparisons
*/
void dr112(void *vp) {
/* The behavior of this expression is pedantically undefined.
* FIXME: should we diagnose under -pedantic?
*/
(void)(vp > (void*)0);
}
/* WG14 DR113: yes
* Return expressions in functions declared to return qualified void
*/
volatile void dr113_v(volatile void *vvp) { /* expected-warning {{function cannot return qualified void type 'volatile void'}} */
return *vvp; /* expected-warning {{void function 'dr113_v' should not return void expression}}
expected-warning{{ISO C does not allow indirection on operand of type 'volatile void *'}} */
}
const void dr113_c(const void *cvp) { /* expected-warning {{function cannot return qualified void type 'const void'}} */
return *cvp; /* expected-warning {{void function 'dr113_c' should not return void expression}}
expected-warning{{ISO C does not allow indirection on operand of type 'const void *'}} */
}
/* WG14 DR114: yes
* Initialization of multi-dimensional char array objects
*/
void dr114(void) {
char array[2][5] = { "defghi" }; /* expected-warning {{initializer-string for char array is too long}} */
}
/* WG14 DR115: yes
* Member declarators as declarators
*/
void dr115(void) {
struct { int mbr; }; /* expected-warning {{declaration does not declare anything}} */
union { int mbr; }; /* expected-warning {{declaration does not declare anything}} */
}
/* WG14 DR116: yes
* Implicit unary & applied to register arrays
*/
void dr116(void) {
register int array[5] = { 0, 1, 2, 3, 4 };
(void)array; /* expected-error {{address of register variable requested}} */
(void)array[3]; /* expected-error {{address of register variable requested}} */
(void)(array + 3); /* expected-error {{address of register variable requested}} */
}
/* WG14 DR118: yes
* Completion point for enumerated types
*/
void dr118(void) {
enum E {
/* The enum isn't a complete type until the closing }, but an
* implementation may complete the type earlier if it has sufficient type
* information to calculate size or alignment, etc.
*
* On Microsoft targets, an enum is always implicit int sized, so the type
* is sufficiently complete there. On other platforms, it is an incomplete
* type at this point.
*/
Val = sizeof(enum E)
#if !defined(_WIN32) || defined(__MINGW32__)
/* expected-error@-2 {{invalid application of 'sizeof' to an incomplete type 'enum E'}} */
/* expected-note@-12 {{definition of 'enum E' is not complete until the closing '}'}} */
#endif
};
}
/* WG14 DR119: yes
* Initialization of multi-dimensional array objects
*/
void dr119(void) {
static int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } }; /* expected-error {{array has incomplete element type 'int[]'}} */
}
/* WG14 DR120: yes
* Semantics of assignment to (and initialization of) bit-fields
*/
void dr120(void) {
/* We could verify this one with a codegen test to ensure that the proper
* value is stored into bit, but the diagnostic tells us what the value is
* after conversion, so we can lean on that for verification.
*/
struct S { unsigned bit:1; };
struct S object1 = { 3 }; /* expected-warning {{implicit truncation from 'int' to bit-field changes value from 3 to 1}} */
struct S object2;
object2.bit = 3; /* expected-warning {{implicit truncation from 'int' to bit-field changes value from 3 to 1}} */
}
/* WG14 DR123: yes
* 'Type categories' and qualified types
*/
void dr123(void) {
/* Both of these examples are strictly conforming. */
enum E1 {
enumerator1 = (const int) 9
};
enum E2 {
enumerator2 = (volatile int) 9
};
}
/* WG14 DR124: yes
* Casts to 'a void type' versus casts to 'the void type'
*/
void dr124(void) {
/* A cast can cast to void or any qualified version of void. */
(const volatile void)0;
}
/* WG14 DR126: yes
* What does 'synonym' mean with respect to typedef names?
*/
void dr126(void) {
typedef int *IP;
const IP object; /* expected-note {{variable 'object' declared const here}} */
/* The root of the DR is whether 'object' is a pointer to a const int, or a
* const pointer to int.
*/
*object = 12; /* ok */
++object; /* expected-error {{cannot assign to variable 'object' with const-qualified type 'const IP' (aka 'int *const')}} */
}
/* WG14 DR128: yes
* Editorial issue relating to tag declarations in type specifiers
*/
void dr128(void) {
{
struct TAG { int i; };
}
{
struct TAG object; /* expected-error {{variable has incomplete type 'struct TAG'}}
expected-note {{forward declaration of 'struct TAG'}}
*/
}
}
/* WG14 DR129: yes
* Tags and name spaces
*/
struct dr129_t { int i; };
void dr129(void) {
enum dr129_t { enumerator }; /* expected-note {{previous use is here}} */
void *vp;
(void)(struct dr129_t *)vp; /* expected-error {{use of 'dr129_t' with tag type that does not match previous declaration}} */
}
/* WG14 DR131: yes
* const member qualification and assignment
*/
void dr131(void) {
struct S {
const int i; /* expected-note {{data member 'i' declared const here}} */
} s1, s2;
s1 = s2; /* expected-error {{cannot assign to variable 's1' with const-qualified data member 'i'}} */
}
/* WG14 DR142: yes
* Reservation of macro names
*/
void dr142(void) {
#include <stddef.h>
/* FIXME: undefining a macro defined by the standard library is undefined
* behavior. We have diagnostics when declaring reserved identifiers, and we
* could consider extending that to undefining a macro defined in a system
* header. However, whether we diagnose or not, we conform.
*/
#undef NULL
}
/* WG14 DR144: yes
* Preprocessing of preprocessing directives
*/
#define DR144
# DR144 include <stddef.h> /* expected-error {{invalid preprocessing directive}} */
DR144 # include <stddef.h> /* expected-error {{expected identifier or '('}} */
/* WG14 DR145:
* Constant expressions
*/
void dr145(void) {
static int array[10];
static int *ip = (int *)0;
/* The below is failing because some systems think this is a valid compile-
* time constant. Commenting the out while investigating whether we implement
* this DR properly or not.
* static int i = array[0] + array[1]; broken-expected-error {{initializer element is not a compile-time constant}}
*/
}
/* WG14 DR150: yes
* Initialization of a char array from a string literal
*/
void dr150(void) {
/* Accept even though a string literal is not a constant expression. */
static char array[] = "Hello, World";
}
/* WG14 DR163: yes
* Undeclared identifiers
*/
void dr163(void) {
int i;
i = undeclared; /* expected-error {{use of undeclared identifier 'undeclared'}} */
sdfsdfsf = 1; /* expected-error {{use of undeclared identifier 'sdfsdfsf'}} */
i = also_undeclared(); /* c99untilc2x-error {{call to undeclared function 'also_undeclared'; ISO C99 and later do not support implicit function declarations}}
c2xandup-error {{use of undeclared identifier 'also_undeclared'}}
*/
}
/* WG14 DR164: yes
* Bad declarations
*/
void dr164(void) {
int a [][5]; /* expected-error {{definition of variable with array type needs an explicit size or an initializer}} */
int x, b [][5]; /* expected-error {{definition of variable with array type needs an explicit size or an initializer}} */
}
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