Viewing file:  Wstringop-truncation-4.c (1.58 KB) -rw-r--r--
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/* PR tree-optimization/85700 - Spurious -Wstringop-truncation warning
with strncat
{ dg-do compile }
{ dg-options "-O2 -Wno-stringop-overflow -Wstringop-truncation -ftrack-macro-expansion=0" } */
#define NOIPA __attribute__ ((noipa))
#define strncat __builtin_strncat
#define strlen __builtin_strlen
extern char a4[4], b4[4], ax[];
NOIPA void cat_a4_s1_1 (void)
{
/* There is no truncation here but since the bound of 1 equals
the length of the source string it's likely a mistake that
could cause overflow so it's diagnosed by -Wstringop-overflow */
strncat (a4, "1", 1);
}
NOIPA void cat_a4_s1_2 (void)
{
strncat (a4, "1", 2);
}
NOIPA void cat_a4_s1_3 (void)
{
strncat (a4, "1", 3);
}
NOIPA void cat_a4_s1_4 (void)
{
/* There is no truncation here but since the bound of 1 equals
the length of the source string it's likely a mistake that
could cause overflow so it's diagnosed by -Wstringop-overflow */
strncat (a4, "1", 4);
}
NOIPA void cat_a4_s1_5 (void)
{
/* A bound in excess of the destination size is diagnosed by
-Wstringop-overflow. */
strncat (a4, "1", 5);
}
NOIPA void cat_a4_s1_dlen (void)
{
strncat (a4, "1", sizeof a4 - strlen (a4) - 1);
}
NOIPA void cat_a4_s2_dlen (void)
{
strncat (a4, "12", sizeof a4 - strlen (a4) - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
}
NOIPA void cat_a4_b4_dlen (void)
{
strncat (a4, b4, sizeof a4 - strlen (a4) - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
}
NOIPA void cat_ax_b4_dlen (void)
{
strncat (ax, b4, 32 - strlen (ax) - 1); /* { dg-bogus "\\\[-Wstringop-truncation]" } */
}
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