// PR c++/24745 : warnings for NULL constant.
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// PR c++/24745 : warnings for NULL constant.
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// { dg-do compile }
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// { dg-do compile }
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// { dg-options "-Wpointer-arith -Wconversion " }
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// { dg-options "-Wpointer-arith -Wconversion " }
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#include
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#include
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int foo (void)
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int foo (void)
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{
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{
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if (NULL == 1) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL == 1) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL > NULL) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL > NULL) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL < NULL) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL < NULL) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL >= 0) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL >= 0) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL <= 0) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL <= 0) return -1; // { dg-warning "NULL used in arithmetic" }
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// Adding to the NULL pointer, which has no specific type, should
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// Adding to the NULL pointer, which has no specific type, should
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// result in a warning; the type of the resulting expression is
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// result in a warning; the type of the resulting expression is
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// actually "int", not a pointer type.
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// actually "int", not a pointer type.
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if (NULL + 1) return -1; // { dg-warning "NULL used in arithmetic" }
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if (NULL + 1) return -1; // { dg-warning "NULL used in arithmetic" }
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if (1 + NULL) return -1; // { dg-warning "NULL used in arithmetic" }
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if (1 + NULL) return -1; // { dg-warning "NULL used in arithmetic" }
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return 0;
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return 0;
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}
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}
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int *ip;
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int *ip;
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struct S {};
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struct S {};
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typedef int S::*SPD;
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typedef int S::*SPD;
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typedef void (S::*SPF)(void);
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typedef void (S::*SPF)(void);
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SPD spd;
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SPD spd;
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SPF spf;
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SPF spf;
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int bar (void)
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int bar (void)
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{
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{
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if (NULL) return -1;
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if (NULL) return -1;
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if (!NULL) return -1;
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if (!NULL) return -1;
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if (!NULL == 1) return -1;
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if (!NULL == 1) return -1;
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if (NULL || NULL) return -1;
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if (NULL || NULL) return -1;
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if (!NULL && NULL) return -1;
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if (!NULL && NULL) return -1;
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if (NULL == NULL) return -1;
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if (NULL == NULL) return -1;
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if (NULL != NULL) return -1;
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if (NULL != NULL) return -1;
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if (NULL == 0) return -1;
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if (NULL == 0) return -1;
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if (NULL != 0) return -1;
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if (NULL != 0) return -1;
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// Subtraction of pointers is vaild, so using NULL is OK.
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// Subtraction of pointers is vaild, so using NULL is OK.
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if (ip - NULL) return -1;
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if (ip - NULL) return -1;
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if (NULL - NULL) return -1;
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if (NULL - NULL) return -1;
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// Comparing NULL with a pointer-to-member is OK.
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// Comparing NULL with a pointer-to-member is OK.
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if (NULL == spd) return -1;
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if (NULL == spd) return -1;
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if (spd == NULL) return -1;
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if (spd == NULL) return -1;
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if (NULL != spd) return -1;
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if (NULL != spd) return -1;
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if (spd != NULL) return -1;
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if (spd != NULL) return -1;
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if (NULL == spf) return -1;
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if (NULL == spf) return -1;
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if (spf == NULL) return -1;
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if (spf == NULL) return -1;
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if (NULL != spf) return -1;
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if (NULL != spf) return -1;
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if (spf != NULL) return -1;
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if (spf != NULL) return -1;
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return 0;
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return 0;
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}
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}
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