Re: Make m4 only call macros surrounded by brackets.

Zack Piper <[email protected]> Sat, 28 Feb 2015 23:21:07 +0000

Newsgroups	gmane.comp.gnu.m4.general
Message-ID	<[email protected]>

On Sat, Feb 28, 2015 at 09:37:30PM +0000, Zack Piper wrote:
> Hello,
> 
> I'm currently trying to figure out how to make m4 only call macros within certain brackets, for example:
> 
> ```
> define(`test', '2')
> test
> ->test
> 
> <test>
> ->2
> ```
> 
> It would be even better if this was possible.
> 
> ```
> define(`test', '2')
> <test>
> -><test>
> 
> <#test>
> ->2
> ```
> 
> Above is exactly what the `-H` flag does on GPP (Generic Preprocessor) (http://files.nothingisreal.com/software/gpp/gpp.html).
> 
> Any help would be great, thanks!
> -- 
> I have nothing fancy or intelligent to put here.

Hm, I found out how to do it. Unfortuently it seems to segfault when using "changeword(`#<\([_a-zA-Z0-9]*\)>)')", and then trying to invoke a macro:

(gdb) run gpp.m4
Starting program: /usr/local/bin/m4 gpp.m4
Got object file from memory but can't read symbols: File truncated.

Program received signal SIGSEGV, Segmentation fault.
next_token (td=td@entry=0x7fffffffd0b0, line=line@entry=0x7fffffffd0ac) at input.c:918
918           if (regs.start[1] != -1)

-- 
I have nothing fancy or intelligent to put here.

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