I've made a few trade-offs in implementation which I'd like to explain more.
First, code doesn't distinguish between guarded internal headers and
headers with x-macros. They are handled the same way. But in tests both
patterns are tested. It is done not to cover all code paths but to test
include-what-you-use from user's perspective.
Also I check if file defining macro is immediate includer. I decided not
to check if it includes file using the macro transitively until we have
such real-life use cases. Current implementation is strict in order to avoid
unexpected results.
For some cases I am reusing mechanism that keeps files included with the
"IWYU pragma: keep" comment. The downside is that it keeps all lines
including this file which might be not entirely correct for x-macros.
Though x-macros are close to pure textual includes and we cannot reason
about textual includes.
I also didn't include a few test cases because I think they don't
represent real-life use cases. These test cases are:
* when associated header is included by non-associated header;
* when file defining macro and file using macro are both included by the
third file.
This reverts commit 5fe99b054b.
It hits assertion
iwyu_include_picker.cc:986: Assertion failed: filepath_visibility_map_[quoted_filepath_pattern] == vis Same file seen with two different visibilities
I've made a few trade-offs in implementation which I'd like to explain more.
First, code doesn't distinguish between guarded internal headers and
headers with x-macros. They are handled the same way. But in tests both
patterns are tested. It is done not to cover all code paths but to test
include-what-you-use from user's perspective.
Also I check if file defining macro is immediate includer. I decided not
to check if it includes file using the macro transitively until we have
such real-life use cases. Current implementation is strict in order to avoid
unexpected results.
Note, that file using macro should be included with #include, not with
defines LLONG_MIN, LLONG_MAX and #include_next system <limits.h> which
on Mac OS X uses [2] LLONG_MIN and LLONG_MAX in C++11 mode.
For some cases I am reusing mechanism that keeps files included with the
"IWYU pragma: keep" comment. The downside is that it keeps all lines
including this file which might be not entirely correct for x-macros.
Though x-macros are close to pure textual includes and we cannot reason
about textual includes.
I also didn't include a few test cases because I think they don't
represent real-life use cases. These test cases are:
* when associated header is included by non-associated header;
* when file defining macro and file using macro are both included by the
third file.
[1] http://clang.llvm.org/doxygen/limits_8h_source.html
[2] http://opensource.apple.com/source/Libc/Libc-1082.20.4/include/limits.
Volodymyr Sapsai