[cfe-dev] Changing module maps

[Thompson, John]

Hi,

I've experienced a few situations where I've been changing a module map during development, or passing module maps to others to try, who then get mysterious warnings or errors, such as:


test.cpp:2:2: warning: missing submodule '_Builtin_intrinsics.intel.x86intrin'

      [-Wincomplete-umbrella]

#include <x86intrin.h>

^       ~

1 warning generated.

Sometimes clang detects it, and issues a relevant warning.  Other times it does not.  (Perhaps due to a time tag being earlier?)  The recovery is to delete the module cache manually.

Is there something we could do to better detect a changed module map, and perhaps even better, also automatically delete the prior module cache to avoid potential problems?  Checksum/CRC the module map?  Use size and file time?

Thanks.

-John

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20150521/8ad0b9af/attachment.html>