Bug#104173: marked as done (<math.h> prototypes missing when _XOPEN_SOURCE=500)
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Date: Tue, 10 Jul 2001 13:06:24 +0100
From: Miah Gregory <miah@picsel.com>
To: submit@bugs.debian.org
Subject: libc6
Message-ID: <3211df974a.miah@picsel.com>
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Package: libc6
Version: 2.2.3-5
Using gcc 2.95.3-7, kernel is 'linux 2.4.4 #4 i686 unknown':
Including math.h into any sourcefile, then compiling using the following gcc
command:
gcc -Wmissing-prototypes -D_XOPEN_SOURCE=500 -O2 -c -o libc6test.o
libc6test.c
results in:
/usr/include/bits/mathinline.h:426: warning: no previous prototype for
`__atan2l'
/usr/include/bits/mathinline.h:441: warning: no previous prototype for
`__sqrtl'
/usr/include/bits/mathinline.h:447: warning: no previous prototype for
`__fabsl'
Removing either -O2 or -D_XOPEN_SOURCE=500 results in no warning being
produced.
The test program used is:
#include <math.h>
int main(void)
{
return 0;
}
--
Miah Gregory, Software Engineer, Picsel Technologies Ltd
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Date: Fri, 30 Jul 2004 15:10:10 +0900
Message-ID: <811xiu81q5.wl@omega.webmasters.gr.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: 104173-done@bugs.debian.org
Subject: Re: <math.h> prototypes missing when _XOPEN_SOURCE=500
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> Package: libc6
> Version: 2.2.3-5
>
> Using gcc 2.95.3-7, kernel is 'linux 2.4.4 #4 i686 unknown':
>
> Including math.h into any sourcefile, then compiling using the following gcc
> command:
>
> gcc -Wmissing-prototypes -D_XOPEN_SOURCE=500 -O2 -c -o libc6test.o
> libc6test.c
>
> results in:
>
> /usr/include/bits/mathinline.h:426: warning: no previous prototype for
> `__atan2l'
> /usr/include/bits/mathinline.h:441: warning: no previous prototype for
> `__sqrtl'
> /usr/include/bits/mathinline.h:447: warning: no previous prototype for
> `__fabsl'
>
> Removing either -O2 or -D_XOPEN_SOURCE=500 results in no warning being
> produced.
>
> The test program used is:
>
> #include <math.h>
> int main(void)
> {
> return 0;
> }
Nowadays we use gcc 3.3, it does not warn it. Moreover, It's not bug.
Look at info libc:
- Macro: _XOPEN_SOURCE
- Macro: _XOPEN_SOURCE_EXTENDED
If you define this macro, functionality described in the X/Open
Portability Guide is included. This is a superset of the POSIX.1
and POSIX.2 functionality and in fact `_POSIX_SOURCE' and
`_POSIX_C_SOURCE' are automatically defined.
As the unification of all Unices, functionality only available in
BSD and SVID is also included.
If the macro `_XOPEN_SOURCE_EXTENDED' is also defined, even more
functionality is available. The extra functions will make all
functions available which are necessary for the X/Open Unix brand.
If the macro `_XOPEN_SOURCE' has the value 500 this includes all
functionality described so far plus some new definitions from the
Single Unix Specification, version 2.
SUSv2 does not mention about atan2l. I close this bug.
Regards,
-- gotom
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