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615e6dd1c5
We recently noticed that the unwrap_iter.h file was pushing macros, but
it was pushing them again instead of popping them at the end of the
file. This led to libc++ basically swallowing any custom definition of
these macros in user code:
#define min HELLO
#include <algorithm>
// min is not HELLO anymore, it's not defined
While investigating this issue, I noticed that our push/pop pragmas were
actually entirely wrong too. Indeed, instead of pushing macros like
`move`, we'd push `move(int, int)` in the pragma, which is not a valid
macro name. As a result, we would not actually push macros like `move`
-- instead we'd simply undefine them. This led to the following code not
working:
#define move HELLO
#include <algorithm>
// move is not HELLO anymore
Fixing the pragma push/pop incantations led to a cascade of issues
because we use identifiers like `move` in a large number of places, and
all of these headers would now need to do the push/pop dance.
This patch fixes all these issues. First, it adds a check that we don't
swallow important names like min, max, move or refresh as explained
above. This is done by augmenting the existing
system_reserved_names.gen.py test to also check that the macros are what
we expect after including each header.
Second, it fixes the push/pop pragmas to work properly and adds missing
pragmas to all the files I could detect a failure in via the newly added
test.
rdar://121365472
(cherry picked from commit 7b4622514d232ce5f7110dd8b20d90e81127c467)
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|---|---|---|
| .. | ||
| access.h | ||
| advance.h | ||
| back_insert_iterator.h | ||
| bounded_iter.h | ||
| common_iterator.h | ||
| concepts.h | ||
| counted_iterator.h | ||
| cpp17_iterator_concepts.h | ||
| data.h | ||
| default_sentinel.h | ||
| distance.h | ||
| empty.h | ||
| erase_if_container.h | ||
| front_insert_iterator.h | ||
| incrementable_traits.h | ||
| indirectly_comparable.h | ||
| insert_iterator.h | ||
| istream_iterator.h | ||
| istreambuf_iterator.h | ||
| iter_move.h | ||
| iter_swap.h | ||
| iterator_traits.h | ||
| iterator_with_data.h | ||
| iterator.h | ||
| mergeable.h | ||
| move_iterator.h | ||
| move_sentinel.h | ||
| next.h | ||
| ostream_iterator.h | ||
| ostreambuf_iterator.h | ||
| permutable.h | ||
| prev.h | ||
| projected.h | ||
| ranges_iterator_traits.h | ||
| readable_traits.h | ||
| reverse_access.h | ||
| reverse_iterator.h | ||
| segmented_iterator.h | ||
| size.h | ||
| sortable.h | ||
| unreachable_sentinel.h | ||
| wrap_iter.h | ||