Re: C99 support

[Roger Leigh]

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Andreas Schwab <address@hidden> writes:

> Roger Leigh <address@hidden> writes:
>
>> Are there any tests I can use to specify that I want a C99 compiler?
>> AC_PROG_CC isn't sufficient.
>
> IMHO the preferred way is to check for the specific features you need
> (eg. with AC_COMPILE_IFELSE) and abort when not provided (or maybe use
> workarounds instead).

I can use the tests for basic stuff like:

- - _Bool
- - inline
- - restrict

and these work well.  What it doesn't do is let me use features such
as mixed declarations and code.  These require you to use "gcc
- -std=c99" or "c99" or similar, and I can't enable this portably.  If
autoconf could find out how to put a given compiler into C99 mode,
that would be great (in the same way as AC_PROG_GCC_TRADITIONAL
works for K&R C).

Once the GCC default is C99 rather than C89, the problem will be
lessened, but this still won't help with non-GCC compilers such as Sun
CC etc., where I might want to abort with an error if it can't be made
to build C99 code.


Regards,
Roger

- -- 
Roger Leigh
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