Use of namespace qualifier with floating point exception functions breaks if they are macros

[Jeremiah Willcock]

According to ​http://pubs.opengroup.org/onlinepubs/009604599/basedefs/fenv.h.html, operations such as feclearexcept can be defined as macros, and at least some versions of Glibc do that by default. The use of explicit :: qualifiers before calls to those in Boost.Test fails to compile. Is there a workaround for that (other than __NO_MATH_INLINES)?

[Gennadiy Rozental]

I prefer to keep :: in front of global functions. I am not aware about other workarounds. What is wrong with NO_MATH_INLINES?

[Jonathan Wakely <jwakely.boost@…>]

This breaks building Boost on ppc64, where feclearexcept is defined as a macro:

​https://bugzilla.redhat.com/show_bug.cgi?id=1262444

The problem is that libs/test/src/execution_monitor.cpp is compiled by Boost.Build (so setting __NO_MATH_INLINES should not be necessary, it should just build) and is compiled as C++03, so GCC's <fenv.h> does not #undef the macros because <fenv.h> is not defined by the C++03 standard library so its effects are an implementation-defined extension to the standard.

Please reconsider the wontfix resolution.

[Akira Takahashi <faithandbrave@…>]

FYI, fix commit is this : ​https://github.com/boostorg/test/commit/f50e7bc9fed323c5705c0ed992c03e80eeec1dd6