Bug 202900 – nearbyint() not declared in <math.h>

Bug 202900 - nearbyint() not declared in <math.h>

Summary:	nearbyint() not declared in <math.h>

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Enterprise Linux 4
Classification:	Red Hat
Component:	glibc (Show other bugs)
Sub Component:
Version:	4.0
Hardware:	All Linux

Priority	medium Severity medium
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Assigned To:	Jakub Jelinek
QA Contact:	Brian Brock
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Reported:	2006-08-16 19:28 EDT by Stephen Rasku
Modified:	2007-11-30 17:07 EST (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2006-08-17 03:04:42 EDT
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Description Stephen Rasku 2006-08-16 19:28:29 EDT

Description of problem:

The prototype for the function nearbyint() is not declared in <math.h> even
though the man page says to #include this file for this function.  If I use the
function as documented I get:

   warning: implicit declaration of function `nearbyint'

Version-Release number of selected component (if applicable):

glibc-2.3.4-2.19

How reproducible: 100%

Steps to Reproduce:
1. #include <math.h>
2. nearbyint(floatExpr);
  
Actual results:

See above.

Expected results:

Program should compile with no warnings.

Comment 1 Jakub Jelinek 2006-08-17 03:04:42 EDT

Please read
info libc 'Feature Test Macros'
As nearbyint is only ISO C99 function, you need one of -std=c99, -std=gnu99,
-D_ISOC99_SOURCE, -D_GNU_SOURCE or -D_XOPEN_SOURCE=600.

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