RTEMS 5.1: cmath compiler errors on m68k/uC5282

Tue Feb 16 23:50:22 UTC 2021

On Feb 16, 2021, at 5:26 PM, Joel Sherrill <joel at rtems.org<mailto:joel at rtems.org>> wrote:

Can you provide a cutdown?

Sure, it’s 1 line of source:

tux% cat m.cpp
#include <cmath>

which when compiled:

tux% /local/anj/RTEMS-5.1/rtems-5.1/bin/m68k-rtems5-g++ -B/local/anj/RTEMS-5.1/rtems-5.1/m68k-rtems5/uC5282/lib/ -specs bsp_specs -qrtems -mcpu=5282 -Wall -c m.cpp
In file included from m.cpp:1:0:
/local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/cmath:1086:11: error: '::acoshl' has not been declared
   using ::acoshl;
           ^~~~~~
/local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/cmath:1090:11: error: '::asinhl' has not been declared
   using ::asinhl;
           ^~~~~~

Long list of errors truncated as before.

And any idea what those using statements are referring to? I know the methods in libm but so not understand what it means in the context of using

I think that's how you ask C++ to import symbols into the current namespace (they are all inside a namespace std {...} block), but I’m not a C++ expert. In any case they come from gcc. EPICS probably doesn’t need any of the missing functions which look to have been added by C99, but we do need to be able to pull in math.h and/or cmath from C++ code.

- Andrew

On Tue, Feb 16, 2021, 4:42 PM Gedare Bloom <gedare at rtems.org<mailto:gedare at rtems.org>> wrote:
Hi Andrew,

On Tue, Feb 16, 2021 at 1:16 PM Johnson, Andrew N. <anj at anl.gov<mailto:anj at anl.gov>> wrote:
>
> I tried to build the in-progress port of EPICS for the uC5282 BSP last night against a release build of RTEMS-5.1 with tools and BSP built using RSB. It looks like the g++ cmath routines haven't been configured properly for this target. It failed at the first C++ source file includes math.h (other BSPs such as the beatnik and qoriq_e500 get further than this, and only the pc686 build completely succeeds right now):
>
> > /local/anj/RTEMS-5.1/rtems-5.1/bin/m68k-rtems5-g++ -B/local/anj/RTEMS-5.1/rtems-5.1/m68k-rtems5/uC5282/lib/ -specs bsp_specs -qrtems     -mcpu=5282       -D_GNU_SOURCE -D_DEFAULT_SOURCE            -DUNIX      -O2 -g -ffunction-sections -fdata-sections   -Wall       -DMY_DO_BOOTP=NULL    -D__LINUX_ERRNO_EXTENSIONS__ -DHAVE_SOCKADDR_SA_LEN=1  -I. -I../O.Common -I. -I../osi/compiler/gcc -I../osi/compiler/default -I. -I../osi/os/RTEMS-posix -I../osi/os/RTEMS -I../osi/os/posix -I../osi/os/default -I.. -I../as -I../bucketLib -I../calc -I../cvtFast -I../cppStd -I../cxxTemplates -I../dbmf -I../ellLib -I../env -I../error -I../fdmgr -I../flex -I../freeList -I../gpHash -I../iocsh -I../log -I../macLib -I../misc -I../osi -I../pool -I../ring -I../taskwd -I../timer -I../yacc -I../yacc -I../yajl -I../../../../include/compiler/gcc -I../../../../include/os/RTEMS -I../../../../include         -c ../cxxTemplates/resourceLib.cpp

I don't see -lm not sure if that is an issue or not, but it seems
suspect. can you snip out the compiler command line to compare with
the pc686 build?

> > In file included from /local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/math.h:36:0,
> >                  from ../cxxTemplates/resourceLib.h:38,
> >                  from ../cxxTemplates/resourceLib.cpp:15:
> > /local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/cmath:1086:11: error: '::acoshl' has not been declared
> >    using ::acoshl;
> >            ^~~~~~
> > /local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/cmath:1090:11: error: '::asinhl' has not been declared
> >    using ::asinhl;
> >            ^~~~~~
> > /local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/cmath:1094:11: error: '::atanhl' has not been declared
> >    using ::atanhl;
> >            ^~~~~~
> >
> > ... many similar errors snipped ...
> >
> > /local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/cmath:1220:11: error: '::tgammal' has not been declared
> >    using ::tgammal;
> >            ^~~~~~~
> > /local/anj/RTEMS-5.1/rtems-5.1/lib/gcc/m68k-rtems5/7.5.0/include/c++/cmath:1224:11: error: '::truncl' has not been declared
> >    using ::truncl;
> >            ^~~~~~
>
> There could very well have been errors building the BSP on my part as I had to hand-create a uC5282.bset file for RSB to build it:
>
> > tux% cat config/5/bsps/uC5282.bset
> > %define mail_single_report 1
> >
> > %define with_rtems_bsp uC5282
> > %define rtems_target   m68k-rtems5
> > %define rtems_host     %{rtems_target}
> >
> > 5/rtems-m68k
> > 5/rtems-kernel
> > 5/rtems-libbsd
>
>
> The libbsd line there might be wrong, but I wouldn’t expect that to affect the availability of <cmath> functions to the C++ compiler.
>
> Any suggestions?
>
> Thanks,
>
> - Andrew
>
> --
> Complexity comes for free, simplicity you have to work for.
>
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