On Thu, Jul 26, 2018 at 11:36 AM, Jeffrey Walton <noloader@xxxxxxxxx> wrote:
...
> The problem is, the project's config.h has some stuff that does not
> seem to fit in the Autotools model like typedefs and declarations of
> namespaces. I think the solution is to write directly to config.h but
> I can't figure out how to do it. Testing code like below is lost
> (i.e., it is not in the resulting config.h):
>
> ## Some real autoconf tests...
>
> cat << EOT >> config.h
> typedef unsigned char byte;
> typedef unsigned short word16;
> typedef unsigned int word32;
> EOT
>
> ## Back to real autoconf tests...
>
> Is it possible to write directly to config.h? If yes, then how do I do it?
I don't think there's any way to _conditionally_ include a block of
code in the generated config.h. If the test can be restructured into
an appropriate form, you could do something like this:
if test $ac_cv_whatever = yes; then
AC_DEFINE([TYPESIZES_C8_S16_I32]
fi
AH_VERBATIM([TYPESIZES_B8_S16_I32_COND],
[#ifdef TYPESIZES_C8_S16_I32_COND
typedef unsigned char byte;
typedef unsigned short word16;
typedef unsigned int word32;
#endif
])
Also, AC_DEFINE_UNQUOTED may be useful.
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