552c6c2328
Old GCC used to aggressively fold VLAs to constant-bound arrays at block scope in GNU mode. That's non-conforming, and more modern versions of GCC only do this at file scope. Update Clang to do the same. Also promote the warning for this from off-by-default to on-by-default in all cases; more recent versions of GCC likewise warn on this by default. This is still slightly more permissive than GCC, as pointed out in PR44406, as we still fold VLAs to constant arrays in structs, but that seems justifiable given that we don't support VLA-in-struct (and don't intend to ever support it), but GCC does. Differential Revision: https://reviews.llvm.org/D89523
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
// RUN: %clang_cc1 %s -ffreestanding -Wno-int-to-pointer-cast -fsyntax-only -verify -pedantic -fpascal-strings -std=c99
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#include <stdint.h>
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#include <limits.h>
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int a() {int p; *(1 ? &p : (void*)(0 && (a(),1))) = 10;} // expected-error {{incomplete type 'void' is not assignable}}
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// rdar://6091492 - ?: with __builtin_constant_p as the operand is an i-c-e.
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int expr;
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char w[__builtin_constant_p(expr) ? expr : 1];
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char v[sizeof(__builtin_constant_p(0)) == sizeof(int) ? 1 : -1];
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int implicitConversion = 1.0;
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char floatArith[(int)(1.0+2.0)]; // expected-warning {{variable length array folded to constant array as an extension}}
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// __builtin_constant_p as the condition of ?: allows arbitrary foldable
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// constants to be transmogrified into i-c-e's.
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char b[__builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+2.0) : -1];
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struct c {
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int a : (
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__builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+
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expr // expected-error {{expression is not an integer constant expression}}
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) : -1);
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};
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void test1(int n, int* p) { *(n ? p : (void *)(7-7)) = 1; }
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void test2(int n, int* p) { *(n ? p : (void *)0) = 1; }
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char array[1024/(sizeof (long))];
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int x['\xBb' == (char) 187 ? 1: -1];
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// PR1992
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void func(int x)
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{
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switch (x) {
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case sizeof("abc"): break;
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case sizeof("loooong"): func(4);
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case sizeof("\ploooong"): func(4);
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}
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}
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// rdar://4213768
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int expr;
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char y[__builtin_constant_p(expr) ? -1 : 1];
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char z[__builtin_constant_p(4) ? 1 : -1];
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// Comma tests
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int comma1[0?1,2:3];
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int comma2[1||(1,2)]; // expected-warning {{use of logical '||' with constant operand}} \
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// expected-note {{use '|' for a bitwise operation}}
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int comma3[(1,2)]; // expected-warning {{variable length array folded to constant array as an extension}}
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// Pointer + __builtin_constant_p
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char pbcp[__builtin_constant_p(4) ? (intptr_t)&expr : 0]; // expected-error {{variable length array declaration not allowed at file scope}}
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int illegaldiv1a[1 || 1/0];
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int illegaldiv1b[1 && 1/0]; //expected-error{{variable length array declaration not allowed at file scope}}
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int illegaldiv2[1/0]; // expected-error {{variable length array declaration not allowed at file scope}}
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int illegaldiv3[INT_MIN / -1]; // expected-error {{variable length array declaration not allowed at file scope}}
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// PR9262
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int illegaldiv4[0 / (1 / 0)]; // expected-error {{variable length array declaration not allowed at file scope}}
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int chooseexpr[__builtin_choose_expr(1, 1, expr)];
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int realop[(__real__ 4) == 4 ? 1 : -1];
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int imagop[(__imag__ 4) == 0 ? 1 : -1];
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int *PR14729 = 0 ?: 1/0; // expected-error {{not a compile-time constant}} expected-warning 3{{}}
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int bcp_call_v;
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int bcp_call_a[] = {__builtin_constant_p(bcp_call_v && 0) ? bcp_call_v && 0 : -1};
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