🚀 go-pugleaf

On Tue, 04 Apr 2000 18:01:47 -0600, Jeff Shipman <shippy@cs.nmt.edu> wrote:
>Sorry if this is not the correct newsgroup to post to. I
>wasn't sure which one would be right. My problem is that
>I'm compiling my program with the -pedantic and -ansi
>flags and I get the following warning:
>
>cb.c:348: warning: implicit declaration of function `gethostname'
>
>I am including unistd.h and it compiles just fine if I
>leave out those two flags. Is it because gethostname()
>is not ANSI C?

Not quite.  It's true that this function is not ANSI C, but then again, neither
is the <unistd.h> header. What is happening is that you are getting only the
minimal set of identifiers out of this POSIX header; you need to add a feature
selection macro something like _XOPEN_SOURCE to enable addtional things that
are not in POSIX.  

In other words, in additon to supressing extensions in ANSI C headers and
ensuring that the compiler accepts all ANSI C programs, the -ansi option
also suppresses extensions in other headers, allowing you to use feature
selection macros to enable specific interface standards.

-- 
#exclude <windows.h>