Make m4 only call macros surrounded by brackets.

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> Today's Topics:
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>    1. Make m4 only call macros surrounded by brackets. (Zack Piper)
>    2. Re: Make m4 only call macros surrounded by brackets. (Zack Piper)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 28 Feb 2015 21:37:30 +0000
> From: Zack Piper <[email protected]>
> To: [email protected]
> Subject: Make m4 only call macros surrounded by brackets.
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
>
> 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.
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> ------------------------------
>
> Message: 2
> Date: Sat, 28 Feb 2015 23:21:07 +0000
> From: Zack Piper <[email protected]>
> To: [email protected]
> Subject: Re: Make m4 only call macros surrounded by brackets.
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
>
> 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)
Couldn't reproduce with my (old) version. Sounds like regs.start is NULL
or uninitialized.