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On 30/07/2014 15:19, Corinna Vinschen wrote:
On Jul 30 15:12, Jon TURNEY wrote:On 30/07/2014 14:54, Jon TURNEY wrote:math.h only defines M_PI and similar constants if __STRICT_ANSI__ is not defined. SUSv2 specifies that math.h should define some of these constants [1]. Attached is a patch to also define these constants if _XOPEN_SOURCE is defined appropriately.So bad :-( This patch doesn't correctly handle the case where _XOPEN_SOURCE is defined as the empty string. Amended patch attached.You can workaround that by using the definition of __XSI_VISIBLE from <sys/cdefs.h>. It's always defined and non-empty.
Yes, that seems a much better way of doing things.However, in my testing, __XSI_VISIBLE seems to be defined by line 704 in cdefs.h with just -std=c99, which doesn't seem right.
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