brunodefraine added a comment.
Following suggestion by @dblaikie and @aaron.ballman I'm preparing a new diff
where a function redeclaration that adds `nodebug` is flagged as an error in
`Sema::mergeDeclAttributes`.
This triggers test failures because of violations in builtin header files, for
example:
In file included from clang/test/CodeGen/ms-intrinsics.c:18:
build/lib/clang/13.0.0/include/intrin.h:451:24: error: function declared with
'nodebug' attribute was previously declared without the 'nodebug' attribute
static __inline__ void __DEFAULT_FN_ATTRS __movsb(unsigned char *__dst,
^
build/lib/clang/13.0.0/include/intrin.h:37:62: note: expanded from macro
'__DEFAULT_FN_ATTRS'
#define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__))
^
build/lib/clang/13.0.0/include/intrin.h:80:6: note: previous declaration is
here
void __movsb(unsigned char *, unsigned char const *, size_t);
^
From what I understand from `clang/lib/Headers/intrin.h` the functions are
declared in general at the beginning of the headers, then implemented for
specific architectures as inline function containing assembly. I do not know if
it is appropriate to mark the general declarations as `nodebug`...
That I already encounter this in builtin headers is probably an indication that
the new error will break some code in the wild. A pragmatic solution would be
to only raise the error in `Sema::mergeDeclAttributes` if `Old->isUsed()`, i.e.
an earlier declaration without `nodebug` can be forgiven if not yet used. I
think that would still make it impossible to trigger the crash?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D104777/new/
https://reviews.llvm.org/D104777
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