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These constants are GNU libc extensions that are likely to be adopted by the next POSIX revision [1]. The definitions can be verified in a PARI-GP shell session: * M_El: exp (1) * M_LOG2El: log (exp (1)) / log (2) * M_LOG10El: log (exp (1)) / log (10) * M_LN2l: log (2) * M_LN10l: log (10) * M_PIl: Pi * M_PI_2l: Pi / 2 * M_PI_4l: Pi / 4 * M_1_PIl: 1 / Pi * M_2_PIl: 2 / Pi * M_2_SQRTPIl: 2 / sqrt (Pi) * M_SQRT2l: sqrt (2) * M_SQRT1_2l: 1 / sqrt (2) [1] https://austingroupbugs.net/view.php?id=828 Put these behind __BSD_VISIBLE || __XSI_VISIBLE >= 800 to future-proof these changes. They shouldn't be defined at lower levels of XSI, but don't have other XSI 800 stuff in place yet. Signed-off-by: Collin Funk <collin.funk1@gmail.com> Reviewed by: imp, allanjude Pull Request: https://github.com/freebsd/freebsd-src/pull/1121 |
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