[llvm-bugs] [Bug 48755] New: clang permits write to const anonymous struct members

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48755

            Bug ID: 48755
           Summary: clang permits write to const anonymous struct members
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk
            Blocks: 4068

Via this LKML thread:
https://lore.kernel.org/lkml/20210114175934.13070-1-will@kernel.org/T/#m1328d75e335d7e58bdd670ca30fea062b738f408

(Reported-by: Will Deacon <will at kernel.org>)

struct foo {
    const struct {
        int bar;
    };
} my_foo;

struct foo2 {
    const struct {
        int bar;
    } named;
} my_foo2;

void baz (void) {
    my_foo.bar = 42; // GCC errors, clang does not
    my_foo2.named.bar = 42; // GCC and Clang error
}

Marking `bar` as const qualified is a portable workaround, for now.

https://godbolt.org/z/h7qPxd


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=4068
[Bug 4068] [Meta] Compiling the Linux kernel with clang
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