Re: Having Trouble with m4 Input (m4 version 1.4.13)

On Fri, Sep 3, 2010 at 11:05, Eric Blake <[email protected]> wrote:
> On 09/03/2010 09:56 AM, Tom Browder wrote:
...
>> Is the '#' stopping it?
...
>>  If so, how can I get the line I want.
...
> or by using proper quoting (so that hashdef no longer expands to a comment
> character, but a quoted string that happens to contain #):
>
> define(`hashdef', ``#'define')dnl

That doesn't work...

> Also, to be robust to non-GNU m4, you should probably also double-quote
> define, or use other tricks to ensure that you don't inadvertently end up
> expanding the define built-in with zero arguments (GNU m4 explicitly
> documents that the define built-in when invoked with zero arguments expands
> to it's own name, as if it hadn't been a macro, but POSIX leaves that bit
> unspecified):
>
> define(`hashdef', ``#define'')dnl

But that does!  So that is the recommended form for portability, no?

Thanks so much, Eric.  I'll probably have more questions before it's over.

Regards,

-Tom

Thomas M. Browder, Jr.
Niceville, Florida
USA