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