Re: Regarding FD_ZERO compilation warning

[Florian Weimer <fweimer@redhat.com>]

* Reddy K. via Libc-help:

> I have enabled all compilation flags and did "make" build. I got the
> warning below and have tried to include required header files ( select.h,
> time.h, types.h and unistd.h) but still it shows the warning. So can you
> please help me to fix this.
>
> ds_locator.c:930:2: warning: traditional C rejects string constant
> concatenation [-Wtraditional]
> FD_ZERO(&readfds);
>
> I am pasting the code snippet below to understand how variable readfds
> define.
> -----------------------------
> fd_set readfds;
> FD_ZERO(&readfds);
>
> ----------------------------

I don't see how glibc's FD_ZERO can trigger this compiler warning.

I suggest you generate preprocessed sources with gcc --save-temps or gcc
-E, and show us the macro expansion.

In general, there is no expectation that the glibc headers are clean
with -Wtraditional, quite the opposite actually.  We require an ISO C
compiler.

Thanks,
Florian