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<p class="MsoNormal">Ah, thanks for the clarification.<o:p></o:p></p>
<p class="MsoNormal">If I can be of any help with the porting, let me know.<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Joel Sherrill <joel@rtems.org> <br>
<b>Sent:</b> Mittwoch, 11. Januar 2023 14:08<br>
<b>To:</b> Sommer, Jan <Jan.Sommer@dlr.de><br>
<b>Cc:</b> rtems-users@rtems.org <users@rtems.org><br>
<b>Subject:</b> Re: C++ math functions not available in namespace std<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">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 <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jan 11, 2023, 3:43 AM <<a href="mailto:Jan.Sommer@dlr.de">Jan.Sommer@dlr.de</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hello and happy New Year,<br>
<br>
I stumbled upon a slightly weird problem with the current cross-compilers.<br>
According to <a href="https://en.cppreference.com/w/cpp/numeric/math/fmax" target="_blank">
https://en.cppreference.com/w/cpp/numeric/math/fmax</a> std::fmax should be part of <cmath> for >= C++11.<br>
However, if I try to use it, I sometimes get "error: 'fmax' is not a member of 'std'; did you mean 'max'?"<br>
<br>
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++.<br>
If I use "fmax" instead of "std::fmax" the file compiles for all 3 architectures.
<br>
However, I have a library which uses the math functions with the namespace qualifier, which I cannot change that easily.<br>
<br>
Does someone know, what is the reason for that behavior (I guess it's related to newlib?) and what a solution could look like?<br>
<br>
Best regards,<br>
<br>
Jan<br>
<br>
<br>
PS: My test file looks like this:<br>
<br>
#include <cmath><br>
<br>
double test(double a, double b)<br>
{<br>
return std::fmax(a, b);<br>
}<br>
<br>
<br>
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