Re: [Boost-bugs] [Boost C++ Libraries] #11756: boost.Test: non standards compliant use of FE_* macros (unable to compile boost test library on FPU-less arches)

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11756: boost.Test: non standards compliant use of FE_* macros (unable to compile boost test library on FPU-less arches)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-03-11 14:39:46

#11756: boost.Test: non standards compliant use of FE_* macros (unable to compile
boost test library on FPU-less arches)
----------------------------------+------------------------
  Reporter:  bartosz.krasinski@…  |      Owner:  renficiaud
      Type:  Patches              |     Status:  reopened
 Milestone:  Boost 1.64.0         |  Component:  test
   Version:  Boost 1.59.0         |   Severity:  Problem
Resolution:                       |   Keywords:
----------------------------------+------------------------

Comment (by Jörg Krause <joerg.krause@…>):

 Sorry about by confusion about fenv.h. The toolchain tarball include the
 C++ Library header file fenv.h in sh4-buildroot-linux-
 uclibc/include/c++/5.4.0/, but it does not have a fenv.h in sysroot. I
 guess the later is generated somehow, right? (I've compared with another
 arm musl-toolchain which does have fenv.h in sysroot).

 ----

 I've compiled the following example with the SH4 C++ compiler:

 {{{#!cc
 #include <iostream>
 #include <cfenv>
 #include <cmath>

 #pragma STDC FENV_ACCESS ON

 volatile double zero = 0.0; // volatile not needed where FENV_ACCESS is
 supported
 volatile double one = 1.0;  // volatile not needed where FENV_ACCESS is
 supported

 int main()
 {
     std::feclearexcept(FE_ALL_EXCEPT);
     std::cout <<  "1.0/0.0 = " << 1.0 / zero << '\n';
     if(std::fetestexcept(FE_DIVBYZERO)) {
         std::cout << "division by zero reported\n";
     } else {
         std::cout << "divsion by zero not reported\n";
     }

     std::feclearexcept(FE_ALL_EXCEPT);
     std::cout << "1.0/10 = " << one/10 << '\n';
     if(std::fetestexcept(FE_INEXACT)) {
         std::cout << "inexact result reported\n";
     } else {
         std::cout << "inexact result not reported\n";
     }

     std::feclearexcept(FE_ALL_EXCEPT);
     std::cout << "sqrt(-1) = " << std::sqrt(-1) << '\n';
     if(std::fetestexcept(FE_INVALID)) {
         std::cout << "invalid result reported\n";
     } else {
         std::cout << "invalid result not reported\n";
     }
 }
 }}}

 Invoking the cross-compiler:

 {{{#!sh
 buildroot ) output/host/usr/bin/sh4-linux-g++ -std=c++11 main.cc
 main.cc: In function ‘int main()’:
 main.cc:12:5: error: ‘feclearexcept’ is not a member of ‘std’
      std::feclearexcept(FE_ALL_EXCEPT);
      ^
 main.cc:12:24: error: ‘FE_ALL_EXCEPT’ was not declared in this scope
      std::feclearexcept(FE_ALL_EXCEPT);
                         ^
 main.cc:14:8: error: ‘fetestexcept’ is not a member of ‘std’
      if(std::fetestexcept(FE_DIVBYZERO)) {
         ^
 main.cc:14:26: error: ‘FE_DIVBYZERO’ was not declared in this scope
      if(std::fetestexcept(FE_DIVBYZERO)) {
                           ^
 main.cc:20:5: error: ‘feclearexcept’ is not a member of ‘std’
      std::feclearexcept(FE_ALL_EXCEPT);
      ^
 main.cc:22:8: error: ‘fetestexcept’ is not a member of ‘std’
      if(std::fetestexcept(FE_INEXACT)) {
         ^
 main.cc:22:26: error: ‘FE_INEXACT’ was not declared in this scope
      if(std::fetestexcept(FE_INEXACT)) {
                           ^
 main.cc:28:5: error: ‘feclearexcept’ is not a member of ‘std’
      std::feclearexcept(FE_ALL_EXCEPT);
      ^
 main.cc:30:8: error: ‘fetestexcept’ is not a member of ‘std’
      if(std::fetestexcept(FE_INVALID)) {
         ^
 main.cc:30:26: error: ‘FE_INVALID’ was not declared in this scope
      if(std::fetestexcept(FE_INVALID)) {

 }}}

 ----

 Commit 02f9a561bc8003cb38fcc5b0863482459a38ea4f (18 October 2016) produces
 the following error:


 {{{#!sh
 from libs/test/src/execution_monitor.cpp:16:
 ./boost/test/execution_monitor.hpp:503:27: error: ‘FE_DIVBYZERO’ was not
 declared in this scope
      BOOST_FPE_DIVBYZERO = FE_DIVBYZERO,
                            ^
 ./boost/test/execution_monitor.hpp:504:27: error: ‘FE_INEXACT’ was not
 declared in this scope
      BOOST_FPE_INEXACT   = FE_INEXACT,
                            ^
 ./boost/test/execution_monitor.hpp:505:27: error: ‘FE_INVALID’ was not
 declared in this scope
      BOOST_FPE_INVALID   = FE_INVALID,
                            ^
 ./boost/test/execution_monitor.hpp:506:27: error: ‘FE_OVERFLOW’ was not
 declared in this scope
      BOOST_FPE_OVERFLOW  = FE_OVERFLOW,
                            ^
 ./boost/test/execution_monitor.hpp:507:27: error: ‘FE_UNDERFLOW’ was not
 declared in this scope
      BOOST_FPE_UNDERFLOW = FE_UNDERFLOW,
                            ^
 ./boost/test/execution_monitor.hpp:509:27: error: ‘FE_ALL_EXCEPT’ was not
 declared in this scope
      BOOST_FPE_ALL       = FE_ALL_EXCEPT,

 }}}

 ----

 Whereas commit eec86d1fbe68aea190ce05a080d20e1569fb82a9 (24 August 2016)
 produces the same error as reported in comment 45.

 ----

 For SH4:
 * `__GLIBC__` is defined
 * `__USE_GNU` is defined

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11756#comment:49>
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