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/* nodiscard attribute tests, adapted from gcc.dg/attr-warn-unused-result.c. */
/* { dg-do compile } */
/* { dg-options "-std=c++17 -O -ftrack-macro-expansion=0" } */
#define WUR [[nodiscard]]
#define WURAI [[nodiscard, gnu::always_inline]] inline
enum [[nodiscard]] E { e };
typedef E (*fnt) (void);
typedef struct { long i; } A;
typedef struct { long i; long j; } B;
typedef struct { char big[1024]; fnt fn; } C;
struct [[nodiscard]] D { int i; D(); ~D(); };
WUR E check1 (void);
WUR void check2 (void); /* { dg-warning "nodiscard" } */
WUR int foo; /* { dg-warning "nodiscard" } */
int bar (void);
WURAI E check3 (void) { return (E)bar (); }
WUR A check4 (void);
WUR B check5 (void);
WUR C check6 (void);
A bar7 (void);
B bar8 (void);
C bar9 (void);
WURAI A check7 (void) { return bar7 (); }
WURAI B check8 (void) { return bar8 (); }
WURAI C check9 (void) { return bar9 (); }
/* This is useful for checking whether return value of statement
expressions (returning int in this case) is used. */
WURAI int check_int_result (int res) { return res; }
#define GU(v) ({ int e = 0; (v) = bar (); if ((v) < 23) e = 14; e; })
fnt fnptr;
WUR E check10 (void);
int baz (void);
WURAI E check11 (void) { return (E)baz (); }
int k;
D check12();
void
test (void)
{
int i = 0, j;
const fnt pcheck1 = check1;
const fnt pcheck3 = check3;
A a;
B b;
C c;
D d;
if (check1 ())
return;
i += check1 ();
i += ({ check1 (); });
check1 (); /* { dg-warning "nodiscard" } */
(void) check1 ();
check1 (), bar (); /* { dg-warning "nodiscard" } */
check2 ();
(void) check2 ();
check2 (), bar ();
if (check3 ())
return;
i += check3 ();
i += ({ check3 (); });
check3 (); /* { dg-warning "nodiscard" } */
(void) check3 ();
check3 (), bar (); /* { dg-warning "nodiscard" } */
a = check4 ();
if (a.i)
return;
if (check4 ().i)
return;
if (({ check4 (); }).i)
return;
check4 (); /* { dg-warning "nodiscard" } */
(void) check4 ();
check4 (), bar (); /* { dg-warning "nodiscard" } */
b = check5 ();
if (b.i + b.j)
return;
if (check5 ().j)
return;
if (({ check5 (); }).j)
return;
check5 (); /* { dg-warning "nodiscard" } */
(void) check5 ();
check5 (), bar (); /* { dg-warning "nodiscard" } */
c = check6 ();
if (c.big[12] + c.big[29])
return;
if (check6 ().big[27])
return;
if (({ check6 (); }).big[0])
return;
check6 (); /* { dg-warning "nodiscard" } */
(void) check6 ();
check6 (), bar (); /* { dg-warning "nodiscard" } */
a = check7 ();
if (a.i)
return;
if (check7 ().i)
return;
if (({ check7 (); }).i)
return;
check7 (); /* { dg-warning "nodiscard" } */
(void) check7 ();
check7 (), bar (); /* { dg-warning "nodiscard" } */
b = check8 ();
if (b.i + b.j)
return;
if (check8 ().j)
return;
if (({ check8 (); }).j)
return;
check8 (); /* { dg-warning "nodiscard" } */
(void) check8 ();
check8 (), bar (); /* { dg-warning "nodiscard" } */
c = check9 ();
if (c.big[12] + c.big[29])
return;
if (check9 ().big[27])
return;
if (({ check9 (); }).big[0])
return;
check9 (); /* { dg-warning "nodiscard" } */
(void) check9 ();
check9 (), bar (); /* { dg-warning "nodiscard" } */
if (check_int_result (GU (j)))
return;
i += check_int_result (GU (j));
i += ({ check_int_result (GU (j)); });
check_int_result (GU (j)); /* { dg-warning "nodiscard" } */
(void) check_int_result (GU (j));
check_int_result (GU (j)), bar (); /* { dg-warning "nodiscard" } */
if (fnptr ())
return;
i += fnptr ();
i += ({ fnptr (); });
fnptr (); /* { dg-warning "nodiscard" } */
(void) fnptr ();
fnptr (), bar (); /* { dg-warning "nodiscard" } */
fnptr = check1;
if (fnptr ())
return;
i += fnptr ();
i += ({ fnptr (); });
fnptr (); /* { dg-warning "nodiscard" } */
(void) fnptr ();
fnptr (), bar (); /* { dg-warning "nodiscard" } */
fnptr = check3;
if (fnptr ())
return;
i += fnptr ();
i += ({ fnptr (); });
fnptr (); /* { dg-warning "nodiscard" } */
(void) fnptr ();
fnptr (), bar (); /* { dg-warning "nodiscard" } */
if (bar9 ().fn ())
return;
i += bar9 ().fn ();
i += ({ bar9 ().fn (); });
bar9 ().fn (); /* { dg-warning "nodiscard" } */
(void) bar9 ().fn ();
bar9 ().fn (), bar (); /* { dg-warning "nodiscard" } */
if ((k ? check1 : check10) ())
return;
i += (k ? check1 : check10) ();
i += ({ (k ? check1 : check10) (); });
(k ? check1 : check10) (); /* { dg-warning "nodiscard" } */
(void) (k ? check1 : check10) ();
(k ? check1 : check10) (), bar (); /* { dg-warning "nodiscard" } */
if ((k ? check3 : check11) ())
return;
i += (k ? check3 : check11) ();
i += ({ (k ? check3 : check11) (); });
(k ? check3 : check11) (); /* { dg-warning "nodiscard" } */
(void) (k ? check3 : check11) ();
(k ? check3 : check11) (), bar (); /* { dg-warning "nodiscard" } */
if (pcheck1 ())
return;
i += pcheck1 ();
i += ({ pcheck1 (); });
pcheck1 (); /* { dg-warning "nodiscard" } */
(void) pcheck1 ();
pcheck1 (), bar (); /* { dg-warning "nodiscard" } */
if (pcheck3 ())
return;
i += pcheck3 ();
i += ({ pcheck3 (); });
pcheck3 (); /* { dg-warning "nodiscard" } */
(void) pcheck3 ();
pcheck3 (), bar (); /* { dg-warning "nodiscard" } */
d = check12 ();
if (d.i)
return;
if (check12 ().i)
return;
if (({ check12 (); }).i)
return;
check12 (); /* { dg-warning "nodiscard" } */
(void) check12 ();
check12 (), bar (); /* { dg-warning "nodiscard" } */
}
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