clang/test/C/drs/dr324.c

/* RUN: rm -rf %t && mkdir %t
   RUN: cp %s %t/dr324.c

   Note: this file (dr324.c) must be newer than the file used for the
     dependency pragma (dep.c), otherwise we get an unrelated "current file is
     older than dependency" warning. Touch dep.c first to make sure it's
     always older.
   RUN: touch %t/dep.c
   RUN: touch %t/dr324.c

   RUN: %clang_cc1 -std=c89 -fsyntax-only -fms-extensions -pedantic -verify %t/dr324.c
   RUN: %clang_cc1 -std=c99 -fsyntax-only -fms-extensions -pedantic -verify %t/dr324.c
   RUN: %clang_cc1 -std=c11 -fsyntax-only -fms-extensions -pedantic -verify %t/dr324.c
   RUN: %clang_cc1 -std=c17 -fsyntax-only -fms-extensions -pedantic -verify %t/dr324.c
   RUN: %clang_cc1 -std=c2x -fsyntax-only -fms-extensions -pedantic -verify %t/dr324.c
 */

/* WG14 DR324: yes
 * Tokenization obscurities
 */

/* We need to diagnose an unknown escape sequence in a string or character
 * literal, but not within a header-name terminal.
 */
const char *lit_str = "\y"; /* expected-warning {{unknown escape sequence '\y'}} */
char lit_char = '\y';       /* expected-warning {{unknown escape sequence '\y'}} */

/* This gets trickier in a pragma where there are implementation-defined
 * locations that may use a header-name production. The first pragma below
 * is using \d but it's in a header-name use rather than a string-literal use.
 * The second pragma is a string-literal and so the \d is invalid there.
 */
#ifdef _WIN32
/* This test only makes sense on Windows targets, where the backslash is a valid
 * path separator.
 */
#pragma GCC dependency "oops\..\dep.c"
#endif
#pragma message("this has a \t tab escape and an invalid \d escape") /* expected-warning {{this has a 	 tab escape and an invalid d escape}}
                                                                        expected-warning {{unknown escape sequence '\d'}}
                                                                      */

/*
 * Note, this tests the behavior of a non-empty source file that ends with a
 * partial preprocessing token such as an unterminated string or character
 * literal. Thus, it is important that no code be added after this test case.
 */
/* expected-error@+3 {{expected identifier or '('}}
   expected-warning@+3 {{missing terminating ' character}}
 */
't