/* RUN: %clang_cc1 -std=c89 -fsyntax-only -Wvla -verify=expected,c89only,c17andearlier -pedantic -Wno-c11-extensions %s
RUN: %clang_cc1 -std=c99 -fsyntax-only -Wvla -verify=expected,c99andup,c17andearlier -pedantic -Wno-c11-extensions %s
RUN: %clang_cc1 -std=c11 -fsyntax-only -Wvla -verify=expected,c99andup,c17andearlier -pedantic %s
RUN: %clang_cc1 -std=c17 -fsyntax-only -Wvla -verify=expected,c99andup,c17andearlier -pedantic %s
RUN: %clang_cc1 -std=c2x -fsyntax-only -Wvla -verify=expected,c99andup,c23andup -pedantic %s
*/
/* The following are DRs which do not require tests to demonstrate
* conformance or nonconformance.
*
* WG14 DR300: yes
* Translation-time expresssion evaluation
*
* WG14 DR301: yes
* Meaning of FE_* macros in <fenv.h>
*
* WG14 DR303: yes
* Breaking up the very long sentence describing preprocessing directive
*
* WG14 DR307: yes
* Clarifiying arguments vs. parameters
*
* WG14 DR308: yes
* Clarify that source files et al. need not be "files"
*
* WG14 DR310: yes
* Add non-corner case example of trigraphs
*
* WG14 DR312: yes
* Meaning of "known constant size"
*
* WG14 DR333: yes
* Missing Predefined Macro Name
*
* WG14 DR342: dup 340
* VLAs and conditional expressions
*/
/* WG14 DR302: yes
* Adding underscore to portable include file name character set
*/
#include "./abc_123.h"
#ifndef WE_SUPPORT_DR302
#error "Oh no, we don't support DR302 after all!"
#endif
/* WG14 DR304: yes
* Clarifying illegal tokens in #if directives
*/
/* expected-error@+3 {{invalid token at start of a preprocessor expression}}
expected-warning@+3 {{missing terminating ' character}}
*/
#if 'test
#endif
/* WG14 DR305: yes
* Clarifying handling of keywords in #if directives
*/
#if int
#error "We definitely should not have gotten here"
#endif
/* WG14 DR306: yes
* Clarifying that rescanning applies to object-like macros
*/
#define REPLACE 1
#define THIS REPLACE
#if THIS != 1
#error "We definitely should not have gotten here"
#endif
/* WG14 DR311: yes
* Definition of variably modified types
*/
void dr311(int x) {
typedef int vla[x]; /* expected-warning {{variable length array}} */
/* Ensure that a constant array of variable-length arrays are still
* considered a variable-length array.
*/
vla y[3]; /* expected-warning {{variable length array}} */
}
/* WG14 DR313: yes
* Incomplete arrays of VLAs
*/
void dr313(int i) {
int c[][i] = { 0 }; /* expected-error {{variable-sized object may not be initialized}}
expected-warning {{variable length array}}
*/
}
/* WG14 DR315: yes
* Implementation-defined bit-field types
*/
struct dr315_t {
unsigned long long a : 37; /* c89only-warning {{'long long' is an extension when C99 mode is not enabled}} */
unsigned long long b : 37; /* c89only-warning {{'long long' is an extension when C99 mode is not enabled}} */
short c : 8;
short d : 8;
} dr315;
_Static_assert(sizeof(dr315.a + dr315.b) == sizeof(unsigned long long), ""); /* c89only-warning {{'long long' is an extension when C99 mode is not enabled}} */
/* Demonstrate that integer promotions still happen when less than the width of
* an int.
*/
_Static_assert(sizeof(dr315.c + dr315.d) == sizeof(int), "");
#if __STDC_VERSION__ < 202311L
/* WG14 DR316: yes
* Unprototyped function types
*/
void dr316_1(a) int a; {} /* expected-warning {{a function definition without a prototype is deprecated in all versions of C and is not supported in C23}} */
void (*dr316_1_ptr)(int, int, int) = dr316_1;
/* WG14 DR317: yes
* Function definitions with empty parentheses
*
* Despite the function with empty parens being a definition, this does not
* provide a prototype for the function. However, calling the function with
* arguments is undefined behavior, so it is defensible for us to warn the user
* about it. They key point to this DR is that we give the "without a
* prototype" warnings to demonstrate we don't give this function a prototype.
*/
void dr317_1() {} /* expected-warning {{a function declaration without a prototype is deprecated in all versions of C}} */
void dr317_2(void) {
if (0)
dr317_1(1); /* expected-warning {{too many arguments in call to 'dr317_1'}}
expected-warning {{passing arguments to 'dr317_1' without a prototype is deprecated in all versions of C and is not supported in C23}}
*/
}
#endif /* __STDC_VERSION__ < 202311L */
/* WG14 DR320: yes
* Scope of variably modified type
*/
int dr320_v;
typedef int dr320_t[dr320_v]; /* c89only-warning {{variable length arrays are a C99 feature}}
expected-error {{variable length array declaration not allowed at file scope}}
c99andup-warning {{variable length array used}}
*/
void dr320(int okay[dr320_v]) { /* c89only-warning {{variable length arrays are a C99 feature}}
c99andup-warning {{variable length array used}}
*/
typedef int type[dr320_v]; /* c89only-warning {{variable length arrays are a C99 feature}}
c99andup-warning {{variable length array used}}
*/
extern type bad; /* expected-error {{variable length array declaration cannot have 'extern' linkage}} */
/* C99 6.7.5.2p2, second sentence. */
static type fine; /* expected-error {{variable length array declaration cannot have 'static' storage duration}} */
}
/* WG14 DR321: yes
* Wide character code values for members of the basic character set
*/
#define DR321 (\
' ' == L' ' && '\t' == L'\t' && '\v' == L'\v' && '\r' == L'\r' && \
'\n' == L'\n' && \
'a' == L'a' && 'b' == L'b' && 'c' == L'c' && 'd' == L'd' && 'e' == L'e' && \
'f' == L'f' && 'g' == L'g' && 'h' == L'h' && 'i' == L'i' && 'j' == L'j' && \
'k' == L'k' && 'l' == L'l' && 'm' == L'm' && 'n' == L'n' && 'o' == L'o' && \
'p' == L'p' && 'q' == L'q' && 'r' == L'r' && 's' == L's' && 't' == L't' && \
'u' == L'u' && 'v' == L'v' && 'w' == L'w' && 'x' == L'x' && 'y' == L'y' && \
'z' == L'z' && \
'A' == L'A' && 'B' == L'B' && 'C' == L'C' && 'D' == L'D' && 'E' == L'E' && \
'F' == L'F' && 'G' == L'G' && 'H' == L'H' && 'I' == L'I' && 'J' == L'J' && \
'K' == L'K' && 'L' == L'L' && 'M' == L'M' && 'N' == L'N' && 'O' == L'O' && \
'P' == L'P' && 'Q' == L'Q' && 'R' == L'R' && 'S' == L'S' && 'T' == L'T' && \
'U' == L'U' && 'V' == L'V' && 'W' == L'W' && 'X' == L'X' && 'Y' == L'Y' && \
'Z' == L'Z' && \
'0' == L'0' && '1' == L'1' && '2' == L'2' && '3' == L'3' && '4' == L'4' && \
'5' == L'5' && '6' == L'6' && '7' == L'7' && '8' == L'8' && \
'9' == L'9' && \
'_' == L'_' && '{' == L'{' && '}' == L'}' && '[' == L'[' && ']' == L']' && \
'#' == L'#' && '(' == L'(' && ')' == L')' && '<' == L'<' && '>' == L'>' && \
'%' == L'%' && ':' == L':' && ';' == L';' && '.' == L'.' && '?' == L'?' && \
'*' == L'*' && '+' == L'+' && '-' == L'-' && '/' == L'/' && '^' == L'^' && \
'&' == L'&' && '|' == L'|' && '~' == L'~' && '!' == L'!' && '=' == L'=' && \
',' == L',' && '\\' == L'\\' && '"' == L'"' && '\'' == L'\'' \
)
#if __STDC_MB_MIGHT_NEQ_WC__
#ifndef __FreeBSD__ /* PR22208, FreeBSD expects us to give a bad (but conforming) answer here. */
_Static_assert(!DR321, "__STDC_MB_MIGHT_NEQ_WC__ but all basic source characters have same representation");
#endif
#else
_Static_assert(DR321, "!__STDC_MB_MIGHT_NEQ_WC__ but some character differs");
#endif
/* WG14 DR328: partial
* String literals in compound literal initialization
*
* DR328 is implemented properly in terms of allowing string literals, but is
* not implemented. See DR339 (marked as a duplicate of this one) for details.
*/
const char *dr328_v = (const char *){"this is a string literal"}; /* c89only-warning {{compound literals are a C99-specific feature}} */
void dr328(void) {
const char *val = (const char *){"also a string literal"}; /* c89only-warning {{compound literals are a C99-specific feature}} */
}
/* WG14 DR335: yes
* _Bool bit-fields
*
* See dr335.c also, which tests the runtime behavior of the part of the DR
* which will compile.
*/
void dr335(void) {
struct bits_ {
_Bool bbf3 : 3; /* expected-error {{width of bit-field 'bbf3' (3 bits) exceeds the width of its type (1 bit)}}
c89only-warning {{'_Bool' is a C99 extension}}
*/
};
}
/* WG14 DR339: dup 328
* Variably modified compound literals
*
* This DR is marked as a duplicate of DR328, see that DR for further
* details.
*
* FIXME: we should be diagnosing this compound literal as creating a variably-
* modified type at file scope, as we would do for a file scope variable.
*/
extern int dr339_v;
void *dr339 = &(int (*)[dr339_v]){ 0 }; /* c89only-warning {{variable length arrays are a C99 feature}}
c99andup-warning {{variable length array used}}
c89only-warning {{compound literals are a C99-specific feature}}
*/
/* WG14 DR340: yes
* Composite types for variable-length arrays
*
* The DR made this behavior undefined because implementations disagreed on the
* behavior. For this DR, Clang accepts the code and GCC rejects it. It's
* unclear whether the Clang behavior is intentional, but because the code is
* UB, any behavior is acceptable.
*/
#if __STDC_VERSION__ < 202311L
void dr340(int x, int y) {
typedef void (*T1)(int);
typedef void (*T2)(); /* expected-warning {{a function declaration without a prototype is deprecated in all versions of C}} */
T1 (*a)[] = 0;
T2 (*b)[x] = 0; /* c89only-warning {{variable length arrays are a C99 feature}}
c99andup-warning {{variable length array used}}
*/
(y ? a : b)[0][0]();
}
#endif /* __STDC_VERSION__ < 202311L */
/* WG14 DR341: yes
* [*] in abstract declarators
*/
void dr341_1(int (*)[*]); /* c89only-warning {{variable length arrays are a C99 feature}}
c99andup-warning {{variable length array used}}
*/
void dr341_2(int (*)[sizeof(int (*)[*])]); /* expected-error {{star modifier used outside of function prototype}} */
/* WG14 DR343: yes
* Initializing qualified wchar_t arrays
*/
void dr343(void) {
const __WCHAR_TYPE__ x[] = L"foo";
}
/* WG14 DR344: yes
* Casts in preprocessor conditional expressions
*
* Note: this DR removed a constraint about not containing casts because there
* are no keywords, therefore no types to cast to, so casts simply don't exist
* as a construct during preprocessing.
*/
#if (int)+0
#error "this should not be an error, we shouldn't get here"
#else
/* expected-error@+1 {{"reached"}} */
#error "reached"
#endif
/* WG14 DR345: yes
* Where does parameter scope start?
*/
void f(long double f,
char (**a)[10 * sizeof f]) {
_Static_assert(sizeof **a == sizeof(long double) * 10, "");
}
/* WG14 DR309: yes
* Clarifying trigraph substitution
*/
int dr309??(1??) = { 1 }; /* c17andearlier-warning {{trigraph converted to '[' character}}
c17andearlier-warning {{trigraph converted to ']' character}}
c23andup-warning 2 {{trigraph ignored}}
c23andup-error {{expected ';' after top level declarator}}
*/
/* NOTE: Due to interactions with the diagnostic system, dr309 should be the
* last test case in this file because subsequent diagnostics may not be
* generated as expected.
*/
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