__STDC_VERSION__ not defined

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__STDC_VERSION__ not defined

Victor Aprea-2
Hey all,

I'm working on porting a library and I've run across an unfortunate surprise (or I'm just doing it wrong). 

Can someone confirm that avr-gcc 4.8.1 doesn't (implicitly) define __STDC_VERSION__ as suggested by https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html#Standard-Predefined-Macros? If not, how is a library to determine if the compiler is C89 or C99 or whatever?

Kind Regards,
Vic

Victor Aprea // Wicked Device

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Re: __STDC_VERSION__ not defined

Georg-Johann Lay-2
On 15.04.2017 19:15, Victor Aprea wrote:
> Hey all,
>
> I'm working on porting a library and I've run across an unfortunate
> surprise (or I'm just doing it wrong).
>
> Can someone confirm that avr-gcc 4.8.1 doesn't (implicitly)
> define __STDC_VERSION__ as suggested by
> https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html#Standard-Predefined-Macros?

It works for me, e.g.:

$ echo | avr-gcc-4.8 -std=iso9899:199409 -xc - -E -dM | grep STDC_V
#define __STDC_VERSION__ 199409L

$ echo | avr-gcc-4.8 -std=iso9899:1999 -xc - -E -dM | grep STDC_V
#define __STDC_VERSION__ 199901L

etc.

$ avr-gcc-4.8 -v
...
Target: avr
Configured with: ../../gcc.gnu.org/gcc-4_8-branch/configure --target=avr
--prefix=/local/gnu/install/gcc-4.8 --disable-nls --with-dwarf2
--enable-target-optspace=yes --with-gnu-ld --with-gnu-as
--enable-languages=c,c++
Thread model: single
gcc version 4.8.5 20150220 (prerelease) (GCC)


Johann

> If not, how is a library to determine if the compiler is C89 or C99 or
> whatever?
>
> Kind Regards,
> Vic


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