[tz] Tzdb build issue

[Naveen kumar]

Hi ,

    I added the -std=gnu11 options also it's shows same error.

On Thu, 1 Jun, 2023, 5:38 am Paul Eggert, <eggert at cs.ucla.edu> wrote:

> On 2023-05-31 13:14, Guy Harris via tz wrote:
> > I was able to build on Ubuntu 14.10 with GCC 4.9.1 by adding
> -DPORT_TO_C89 to the end of the "CFLAGS=" line in Makefile before running
> make; it didn't build unless I did that, as GCC 4.9.1 didn't recognize
> "restrict" as a keyword.
>
> <https://gcc.gnu.org/c99status.html> says the 'restrict' keyword is
> supported by GCC 2.95 (1999) and later. GCC 4 and earlier, though, need
> an option like '-std=gnu11' to enable 'restrict', as these GCC versions
> default to C89 and 'restrict' is incompatible with C89.
>
> Come to think of it, it's probably better to use -std=gnu11 than
> -DPORT_TO_C89 on Naveen's platform. Something like this, say:
>
>    make -j6 zic=zic cc=arm-linux-gnueabi-gcc \
>      ZDUMPDIR=/usr/sbin ZFLAGS="-b slim" \
>      CFLAGS="-std=gnu11 -Os -g -pipe"
>
> I installed the attached commentary patch into TZDB, to try to help
> others in Naveen's shoes.
>
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