On Wed, Jan 11, 2023 at 8:46 AM <jan.som...@dlr.de> wrote: > Ah, thanks for the clarification. >
FWIW in case someone looks at this, I think this impacts aarch64, x86, powerpc, and maybe one other architecture. I just don't remember for sure. > If I can be of any help with the porting, let me know. > Thanks. Maybe some testing. --joel > > > > > *From:* Joel Sherrill <j...@rtems.org> > *Sent:* Mittwoch, 11. Januar 2023 14:08 > *To:* Sommer, Jan <jan.som...@dlr.de> > *Cc:* rtems-us...@rtems.org <users@rtems.org> > *Subject:* Re: C++ math functions not available in namespace std > > > > This happens on the architectures where size of long double is not the > same as double. The header file disables everything if any math method is > missing. > > > > I have it on my list to address. I was porting the long double methods > from FreeBSD before anyone ran into this but haven't finished > > > > On Wed, Jan 11, 2023, 3:43 AM <jan.som...@dlr.de> wrote: > > Hello and happy New Year, > > I stumbled upon a slightly weird problem with the current cross-compilers. > According to https://en.cppreference.com/w/cpp/numeric/math/fmax > std::fmax should be part of <cmath> for >= C++11. > However, if I try to use it, I sometimes get "error: 'fmax' is not a > member of 'std'; did you mean 'max'?" > > I do get the error when compiling the test file (see below) with > i386-rtems6-g++ and riscv-rtems6-g++, but for example not for > arm-rtems6-g++. > If I use "fmax" instead of "std::fmax" the file compiles for all 3 > architectures. > However, I have a library which uses the math functions with the namespace > qualifier, which I cannot change that easily. > > Does someone know, what is the reason for that behavior (I guess it's > related to newlib?) and what a solution could look like? > > Best regards, > > Jan > > > PS: My test file looks like this: > > #include <cmath> > > double test(double a, double b) > { > return std::fmax(a, b); > } > > > _______________________________________________ > users mailing list > users@rtems.org > http://lists.rtems.org/mailman/listinfo/users > >
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