http://bugs.freedesktop.org/show_bug.cgi?id=24318--- Comment #11 from Jon TURNEY <
jon.turney@...> 2009-10-24 10:24:29 PST ---
Attached a couple of patches with an effort to do this better.
As written, this falls back to explicitly defining M_PI using -D o the compiler
command line if it can't make math.h define it. This probably isn't a good
idea. Probably it should do nothing, but this probably breaks stuff on some
targets which should include compiler.h but doesn't?
Visual C projects will need updating to use _USE_MATH_DEFINES.
I have assumed that the precision of the value of M_PI is not significant, as
it varies from place to place, which should be the case anyhow, as these values
are only a fall-back
(In reply to comment #8)
> IIRC when compiling with gcc -ansi, M_PI isn't defined.
>
> In my math.h, its definition is wrapped in '#if defined __USE_BSD || defined
> __USE_XOPEN'
I have the same. I believe that -U__STRICT_ANSI__ is the way to access these
definitions if you want to use -ansi, but this may be incorrect.
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