Bug 185932 – When compiling with --std=c99, drand48 is not in stdlib.h

Bug 185932 - When compiling with --std=c99, drand48 is not in stdlib.h

Summary:	When compiling with --std=c99, drand48 is not in stdlib.h

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	glibc (Show other bugs)
Sub Component:
Version:	rawhide
Hardware:	i386 Linux

Priority	medium Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Jakub Jelinek
QA Contact:	Brian Brock
Docs Contact:

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Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2006-03-19 21:03 EST by Horst H. von Brand
Modified:	2007-11-30 17:11 EST (History)
CC List:	0 users

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed:	2006-03-20 10:38:54 EST
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RHEL 7.3 requirements from Atomic Host:
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Attachments	(Terms of Use)
A little test program (61 bytes, text/plain) 2006-03-19 21:03 EST, Horst H. von Brand	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Horst H. von Brand 2006-03-19 21:03:35 EST

Description of problem:
Compiling a program using drand48(3) it is not declared, but withhout it there
are no complaints.

Version-Release number of selected component (if applicable):
glibc-2.4-4, gcc-4.1.0-3

How reproducible:
Always

Steps to Reproduce:
1. Compile program given below with "gcc --std=c99 -c tst.c"
2.
3.
  
Actual results:
tst.c: In function âtstâ:
tst.c:5: warning: implicit declaration of function âdrand48â

Expected results:
No warnings

Additional info:

Comment 1 Horst H. von Brand 2006-03-19 21:03:39 EST

Created attachment 126331 [details]
A little test program

Comment 2 Jakub Jelinek 2006-03-20 10:38:54 EST

That's correct, <stdlib.h> header content is mandated by ISO C99, and drand48
is not an ISO C99 function.
Please read
info libc 'Feature Test Macros'
for details.  E.g. -std=gnu99 instead of -std=c99, or -std=c99 -D_GNU_SOURCE,
-std=c99 -D_XOPEN_SOURCE=600 and several other switches will provide the drand48
prototype.

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