[Bug libstdc++/69893] [6 Regression] Conflicting declarations in and

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69893

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The problem is in TR1, which parallel mode uses:

#include <math.h>
#include <tr1/cmath>