diff options
Diffstat (limited to 'man3/fpclassify.3')
| -rw-r--r-- | man3/fpclassify.3 | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/man3/fpclassify.3 b/man3/fpclassify.3 index c20dabea76..26e0fb4ac9 100644 --- a/man3/fpclassify.3 +++ b/man3/fpclassify.3 @@ -3,7 +3,7 @@ .\" This was done with the help of the glibc manual. .\" .\" 2004-10-31, aeb, corrected -.TH FPCLASSIFY 3 2004-10-31 "" "Linux Programmer's Manual" +.TH FPCLASSIFY 3 2007-07-26 "" "Linux Programmer's Manual" .SH NAME fpclassify, isfinite, isnormal, isnan, isinf \- floating-point classification macros @@ -22,7 +22,30 @@ classification macros .BI "int isinf(" x ); .fi .sp -Compile with \fI\-std=c99\fP; link with \fI\-lm\fP. +Link with \fI\-lm\fP. +.sp +.in -4n +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.in +.sp +.\" I haven't fully grokked the source to determine the FTM requirements; +.\" in part, the following has been tested by experiment. +.ad l +.BR fpclassify (), +.BR isfinite (), +.BR isnormal (): +_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or +.I cc\ -std=c99 +.br +.BR isnan (): +_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE; or +.I cc\ -std=c99 +.br +.BR isinf (): +_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or +.I cc\ -std=c99 +.ad b .SH DESCRIPTION Floating point numbers can have special values, such as infinite or NaN. |