[llvm-bugs] [Bug 35881] New: Unable to initialize/assign a pointer to VLA

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35881

            Bug ID: 35881
           Summary: Unable to initialize/assign a pointer to VLA
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ignat.loskutov at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Consider the following example:

int foo(int *ptr, size_t rows, size_t cols) {
    int (*m)[cols] = (int(*)[cols])(ptr);
    return m[rows - 1][cols - 1];
}

It fails to compile in C++ mode with a weird error message:

1 : <source>:1:11: error: cannot initialize a variable of type 'int (*)[cols]'
with an rvalue of type 'int (*)[cols]'
    int (*ptr)[cols] = (int(*)[cols])(m);
          ^            ~~~~~~~~~~~~~~~~~

Although VLAs are not a part of C++ standard, Clang claims to support them for
compatibility with GCC. GCC, ICC, and Clang in C mode compile this piece of
code successfully.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20180109/c5d47df9/attachment.html>