xilinx_zynqmp_ilp32_zu3eg namespace issue (cmath round not in std)

[Joel Sherrill]

On Wed, Oct 5, 2022 at 1:20 PM Trip Richert <trip.richert at nta-inc.net>
wrote:

> I'm having an issue compiling using with the ilp32 compiler.  Some free
> functions, which should be in the std namespace, aren't namespaced.
>
> Here's an example.
>
> #include <cmath>
> double round_wrapper(double val)
> {
>    return std::round(val);
> }
>
> I get an error message that the round function isn't in the std
> namespace.  Calling return round(val); without the std namespace compiles
> successfully.
>
> This is the command I used to compile
>
> /opt/rtems/6/aarch64/bin/aarch64-rtems6-g++ -std=gnu++11 -D_GNU_SOURCE
> -D__RTEMS_MAJOR__=6 -D__rtems__ -fno-strict-aliasing -mcpu=cortex-a53
> -mabi=ilp32
> -isystem
> /opt/rtems/6/aarch64/bsps/aarch64-rtems6/xilinx_zynqmp_ilp32_zu3eg/lib/include
> -qrtems -ffunction-sections
> -fdata-sections -fPIC -o test.obj -c example.cpp
>
> I tried a couple of revisions of rtems, the latest was  aarch64-rtems6-g++
> (GCC) 12.2.1 20220924 (RTEMS 6, RSB
> cfed1659a297cb0f95a03e053345962097aa02bf, Newlib 01f6251c0)
>
> if I try to compile the exact same code with similar arguments for arm
> zedboard, it compiles successfully.  So, something is different about the
> ilp32 compiler
>
> /opt/rtems/6/arm/bin/arm-rtems6-g++  -std=gnu++11 -D__RTEMS_MAJOR__=6
> -D__rtems__ -fno-strict-aliasing -mthumb -mfpu=neon -mfloat-abi=hard
> -march=armv7-a -mtune=cortex-a9 -isystem
> /opt/rtems/6/arm/bsps/arm-rtems6/xilinx_zynq_zedboard/lib/include -qrtems
> -ffunction-sections -fdata-sections -fPIC  -o test.obj -c example.cpp
>

What gcc version is this? <cmath> is provided by gcc.


>
> I wasn't sure whether to send this to the bug email list, or to check here
> first to see if someone noticed something I was messing up first.
>

This is a good enough place to start the discussion.

--joel

>
>
> Thanks,
> Trip Richert
>
>
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