2cb2cd242c
C89 allowed a type specifier to be elided with the resulting type being int, aka implicit int behavior. This feature was subsequently removed in C99 without a deprecation period, so implementations continued to support the feature. Now, as with implicit function declarations, is a good time to reevaluate the need for this support. This patch allows -Wimplicit-int to issue warnings in C89 mode (off by default), defaults the warning to an error in C99 through C17, and disables support for the feature entirely in C2x. It also removes a warning about missing declaration specifiers that really was just an implicit int warning in disguise and other minor related cleanups.
116 lines
4.2 KiB
C
116 lines
4.2 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify %s -pedantic -std=c99 -Wno-strict-prototypes
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int __attribute__(()) x;
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__inline void __attribute__((__always_inline__, __nodebug__))
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foo(void) {
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}
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__attribute__(()) y; // expected-error {{type specifier missing, defaults to 'int'}}
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// PR2796
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int (__attribute__(()) *z)(long y);
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void f1(__attribute__(()) int x);
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int f2(y, __attribute__(()) x); // expected-error {{expected identifier}}
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// This is parsed as a normal argument list (with two args that are implicit
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// int) because the __attribute__ is a declspec.
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void f3(__attribute__(()) x, // expected-error {{type specifier missing, defaults to 'int'}}
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y); // expected-error {{type specifier missing, defaults to 'int'}}
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void f4(__attribute__(())); // expected-error {{expected parameter declarator}}
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// This is ok, the __attribute__ applies to the pointer.
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int baz(int (__attribute__(()) *x)(long y));
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void g1(void (*f1)(__attribute__(()) int x));
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void g2(int (*f2)(y, __attribute__(()) x)); // expected-error {{expected identifier}}
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void g3(void (*f3)(__attribute__(()) x, int y)); // expected-error {{type specifier missing, defaults to 'int'}}
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void g4(void (*f4)(__attribute__(()))); // expected-error {{expected parameter declarator}}
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void (*h1)(void (*f1)(__attribute__(()) int x));
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void (*h2)(int (*f2)(y, __attribute__(()) x)); // expected-error {{expected identifier}}
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void (*h3)(void (*f3)(__attribute__(()) x)); // expected-error {{type specifier missing, defaults to 'int'}}
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void (*h4)(void (*f4)(__attribute__(()))); // expected-error {{expected parameter declarator}}
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// rdar://6131260
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int foo42(void) {
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int x, __attribute__((unused)) y, z;
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return 0;
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}
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// rdar://6096491
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void __attribute__((noreturn)) d0(void), __attribute__((noreturn)) d1(void);
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void d2(void) __attribute__((noreturn)), d3(void) __attribute__((noreturn));
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// PR6287
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void __attribute__((returns_twice)) returns_twice_test(void);
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int aligned(int);
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int __attribute__((vec_type_hint(char, aligned(16) )) missing_rparen_1; // expected-error 2{{expected ')'}} expected-note {{to match}} expected-warning {{does not declare anything}}
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int __attribute__((mode(x aligned(16) )) missing_rparen_2; // expected-error 2{{expected ')'}}
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int __attribute__((format(printf, 0 aligned(16) )) missing_rparen_3; // expected-error 2{{expected ')'}}
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int testFundef1(int *a) __attribute__((nonnull(1))) { // \
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// expected-warning {{GCC does not allow 'nonnull' attribute in this position on a function definition}}
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return *a;
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}
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// noreturn is lifted to type qualifier
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void testFundef2(void) __attribute__((noreturn)) { // \
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// expected-warning {{GCC does not allow 'noreturn' attribute in this position on a function definition}}
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testFundef2();
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}
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int testFundef3(int *a) __attribute__((nonnull(1), // \
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// expected-warning {{GCC does not allow 'nonnull' attribute in this position on a function definition}}
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pure)) { // \
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// expected-warning {{GCC does not allow 'pure' attribute in this position on a function definition}}
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return *a;
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}
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int testFundef4(int *a) __attribute__((nonnull(1))) // \
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// expected-warning {{GCC does not allow 'nonnull' attribute in this position on a function definition}}
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__attribute((pure)) { // \
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// expected-warning {{GCC does not allow 'pure' attribute in this position on a function definition}}
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return *a;
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}
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// GCC allows these
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void testFundef5(void) __attribute__(()) { }
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__attribute__((pure)) int testFundef6(int a) { return a; }
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void deprecatedTestFun(void) __attribute__((deprecated()));
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struct s {
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int a;
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};
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// This test ensure compatibility with parsing GNU-style attributes
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// where the attribute is on a separate line from the elaborated type
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// specifier.
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struct s
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__attribute__((used)) bar;
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// Ensure that attributes must be separated by a comma (PR38352).
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__attribute__((const const)) int PR38352(void); // expected-error {{expected ')'}}
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// Also ensure that we accept spurious commas.
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__attribute__((,,,const)) int PR38352_1(void);
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__attribute__((const,,,)) int PR38352_2(void);
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__attribute__((const,,,const)) int PR38352_3(void);
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__attribute__((,,,const,,,const,,,)) int PR38352_4(void);
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