Bug 61316

Summary: possible bug in math.h when using __USE_ISOC99
Product: [Retired] Red Hat Linux Reporter: Need Real Name <nbock>
Component: glibcAssignee: Jakub Jelinek <jakub>
Status: CLOSED NOTABUG QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.2CC: fweimer
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Hardware: i686   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2002-03-17 17:33:19 UTC Type: ---
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patch for math.h none

Description Need Real Name 2002-03-17 17:32:02 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020311

Description of problem:
When using the __USE_ISOC99 macro with math.h the compiler throws an error.

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


How reproducible:
Always

Steps to Reproduce:
1.write c-program with

#define __USE_ISOC99
#include <math.h>

and compile.

2.compiler complains that

/usr/include/math.h:118:17: #if with no expression
/usr/include/math.h:354:17: #if with no expression
Comment 1 Need Real Name 2002-03-17 17:33:15 UTC 
Created attachment 48804 [details]
patch for math.h
Comment 2 Jakub Jelinek 2002-03-17 19:10:51 UTC 
That's no bug. You shouldn't define glibc's internal macros.
If you want ISO C99 functions, use either:
-std=c99
-D_ISOC99_SOURCE
-D__STDC_VERSION__=199901L
(in order of preference).
This is all documented in info libc and /usr/include/features.h too.