Error using 'ctime'

Gedare Bloom gedare at
Thu Jan 30 17:57:58 UTC 2020

Hi Mike,

Just a thought, but it looks like you're compiling a 'c' program (based on
file extension) with the c++ headers and libraries. This could be the
source of the errors.


On Thu, Jan 30, 2020, 9:13 AM M. Dodson <md403 at> wrote:

> *** I am hitting the mailing list with two questions because I’m not sure
> they’re sufficiently related to be in the same email.  Much of this
> information will be the identical between them, but the traces will be
> different.  ***
> I am trying to build the simplest of demo applications from the Robot
> Operating System (ROS) on top of RTEMS.
> I have a .c file (talker_init.c) that contains my Init function and a .cpp
> file (talker.cpp) that contains a function creating a ROS talker (just
> looping “hello world [counter value]”).  The Init function in the .c file
> calls the talker function in the .cpp file.
> The ROS libraries rely on Boost libraries.  I think I’ve figured out how
> to get waf to find them (at least, that’s not where I appear to have
> problems).
> My 'waf configure' command seems to complete without error.
> When I 'waf build -v’, I get a slew of errors.
> 1.  A trace from the first set of errors is below.  Basically, all of the
> ‘using ::[something]’ statements in ctime produce similar error.
> 2.  A trace from the second set of errors is also below.  I get many
> errors associated with boost elements being out of scope.  I can build this
> just fine when I’m not cross-compiling for RTEMS.
> I am using MacO Catalina 10.15.2 on a MacBook Pro.
> I have added my own project directory within the rtems-examples repository
> and effectively copied a wscript file from another example project, so I’m
> still relying on the top-level wscript file and the additional elements in
> the rtems_waf directory.
> Mike
> ---
> examples $ ./waf build
> Waf: Entering directory
> `/Users/michaeldodson/projects/rtems_root/examples/build/riscv-rtems5-rv64imac_medany'
> [1/4] Compiling ros/talker/talker.cpp
> [2/4] Compiling ros/talker/talker_init.c
> In file included from
> /Users/michaeldodson/projects/rtems_root/rtems/5/lib/gcc/riscv-rtems5/9.2.0/include/c++/bits/locale_facets_nonio.h:39,
>                  from
> /Users/michaeldodson/projects/rtems_root/rtems/5/lib/gcc/riscv-rtems5/9.2.0/include/c++/locale:41,
>                  from
> /Users/michaeldodson/projects/rtems_root/rtems/5/lib/gcc/riscv-rtems5/9.2.0/include/c++/iomanip:43,
>                  from
> /usr/local/include/boost/math/policies/error_handling.hpp:12,
>                  from
> /usr/local/include/boost/math/special_functions/round.hpp:14,
>                  from
> ../../../../ros/melodic_catkin_ws/install_isolated/include/ros/time.h:58,
>                  from
> ../../../../ros/melodic_catkin_ws/install_isolated/include/ros/ros.h:38,
>                  from ../../ros/talker/talker.cpp:1:
> /Users/michaeldodson/projects/rtems_root/rtems/5/lib/gcc/riscv-rtems5/9.2.0/include/c++/ctime:64:11:
> error: '::clock' has not been declared
>    64 |   using ::clock;
>       |           ^~~~~
> _______________________________________________
> users mailing list
> users at
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