#778659 cppcheck: check for double evaluation when using macros

Package:
cppcheck
Source:
cppcheck
Description:
tool for static C/C++ code analysis (CLI)
Submitter:
Paul Wise
Date:
2021-09-22 04:42:12 UTC
Severity:
wishlist
Tags:
#778659#5
Date:
2015-02-18 01:32:16 UTC
From:
To:
The article at [1] reports about an issue with the MIN and MAX macros
that cause double evaluation by default. I think the more general issue
is worth checking for, please add a check for double evaluation when
using macros. Here is a test case from [1], the warning should trigger
on the second use of the min macro but not the first.

#include <stdio.h>

#define min(a, b) ((a) < (b)) ? (a) : (b)

int main() {
    int a = 1, b = 2;
    printf ("%d\n", min (a, b));
    printf ("a=%d, b=%d\n\n", a, b);

    printf ("%d\n", min (a++, b++));
    printf ("a=%d, b=%d\n\n", a, b);
}

     1. http://dustri.org/b/min-and-max-macro-considered-harmful.html
#778659#10
Date:
2015-09-08 18:45:36 UTC
From:
To:
forwarded 778659 http://trac.cppcheck.net/ticket/6984
thanks
#778659#23
Date:
2021-09-22 04:23:55 UTC
From:
To:
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