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Date: Fri, 18 Jun 2010 19:48:00 -0000
Subject: [Bug c/44586]  New: gcc does not warn about casting non-variadic types to variadic types
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From: "raj dot khem at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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the folowing testcase does a casting which results in undefined behaviour but
gcc does not warn about it.

ypedef int (*bar_t)(int x, int y, ...);

int foo(int x, int y) {
        return x+y;
}

void f(int x, int y) {
       bar_t bar;

       /* Cast foo to variadic type... undefined behaviour */
       bar = (bar_t) foo;
       (*bar)(x,y);
}


-- 
           Summary: gcc does not warn about casting non-variadic types to
                    variadic types
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: raj dot khem at gmail dot com
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44586