[Bug libstdc++/59087] Issues including complex.h in C++11/1y mode because of C's complex.h

[vlovich at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59087

Vitali <vlovich at gmail dot com> changed:

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                 CC|                            |vlovich at gmail dot com

--- Comment #11 from Vitali <vlovich at gmail dot com> ---
I ran into this problem as I included lapacke.h & indirectly, via including <
boost/exception/all.hpp> picked up boost's iterator_facade.hpp.

All of this is out of my control to resolve.  lapacke correctly includes
complex.h (since it is C code).  iterator_facade correctly uses I as the name
for a template   argument (just as easily could have been used as a variable
name).  The combination results in code that doesn't work.

I had to #undef I.

I'm not sure if that's a GCC bug as opposed to something the standard needs to
resolve.