[Bug c/12213] [3.4 regression] warning: conflicting types for builtin-function 'gamma'

["mec at shout dot net" <gcc-bugzilla at gcc dot gnu dot org>]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12213



------- Additional Comments From mec at shout dot net  2003-09-08 21:24 -------
Subject: Re:  [3.4 regression] warning: conflicting types for builtin-function 'gamma'

Okay, I found the language in a draft of C9X.  Section 7.1.3 says that
external identifiers are reserved unconditionally, without saying that
the header file must be included.  I don't like it but that's the
specification.

But are you sure that 'gamma' is defined in C89?  I don't have a C89
standard, but I do have a draft C9X standard, and there is no 'gamma'
in math.h in C9X.  There is only:

  lgamma lgammaf lgammal
  tgamma tgammaf tgammal

I wonder if 'gamma' is defined in C89?

So 'gamma' should not be a reserved identifier with "gcc -std=c99".  And
indeed, "gcc -std=c99" compiles the test program just fine.  So does
"gcc -std=c89".

I guess that means 'gamma' is a gnu extension, which is okay.

Michael C