This is the mail archive of the mailing list for the newlib project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] Add simple versions of random() and srandom()

On 03/23/2016 02:00 PM, Yaakov Selkowitz wrote:
On 2016-03-23 09:32, Craig Howland wrote:
On 03/23/2016 01:04 AM, Yaakov Selkowitz wrote:
On 2016-03-22 17:51, Joel Sherrill wrote:
Prototypes also added for initstate() and setstate() but they
were not implemented.

This should allow Cygwin to remove its own declarations of these


#if __MISC_VISIBLE || __XSI_VISIBLE >= 500
No, the value 4 is actually the right one.  At first look I had also
thought that it needed to be 500, but it originated in issue 4 as an
X/OPEN UNIX extension (see,
and was moved to BASE in issue 5.

Just great, so we have conflicting documentation. :-( I agree with your assessment but Linux man-pages says it's >= 500:

I have the same error in man random under RHEL6 (which likely comes from the URL you reference), but I went straight to POSIX to check under the assumption Joel had picked 4 with a reason. I just checked further, and their error does seem to be only in the man page. At least with GLIBC 2.12 on RHEL6, the headers--referring only to the POSIX aspect--need either _XOPEN_SOURCE >= 500 || (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED). I've sent an email to report the bug on the manpage. However, they might have purposely suppressed the additional clarifier:
          If this macro is defined, and _XOPEN_SOURCE is defined, then
          expose definitions corresponding to the XPG4v2 (SUSv1) UNIX
          extensions (UNIX 95).  Defining _XOPEN_SOURCE with a value of 500
          or more also produces the same effect as defining
          source code should be avoided.

          Since defining _XOPEN_SOURCE with a value of 500 or more has the
          same effect as defining _XOPEN_SOURCE_EXTENDED, the latter
          (obsolete) feature test macro is generally not described in the
          SYNOPSIS in man pages."

This email is to get the information into the record. Joel's revised patch is sufficient for the user to get it to work. (As the quote from the Linux man pages points out, new code should not be starting out with _XOPEN_SOURCE < 500, anyway.)

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]