export macro cannot be used on same line # in different files in same translation unit

[kfriddile@…]

In export.hpp the BOOST_CLASS_EXPORT macro calls the BOOST_CLASS_EXPORT_GUID macro which uses the LINE directive in an attempt to create a globally unique variable name. However, if multiple headers use the aforementioned macro on the same line #, and are included in the same translation unit, compilation will fail due to variable redefinition. This scenario isn't unlikely, as I had three conflicting headers out of the five I included in a single cpp. I have attached a patch in unified diff format that fixes this issue for me, but has not been run through any unit tests.

[Robert Ramey]

This looks ok. I rolled in a version of this patch to my local system where it will eventually migrate into the package.

Robert Ramey