Bug 202900

Summary:	nearbyint() not declared in <math.h>
Product:	Red Hat Enterprise Linux 4	Reporter:	Stephen Rasku <redhat>
Component:	glibc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED NOTABUG	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0
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Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2006-08-17 07:04:42 UTC	Type:	---
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Description Stephen Rasku 2006-08-16 23:28:29 UTC

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 07:04:42 UTC

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.