[PATCH v3][BZ #17787] Fix exponents in manual.

[Carlos O'Donell]

On 06/18/2015 10:34 AM, Joseph Myers wrote:
> On Thu, 18 Jun 2015, Ondřej Bílka wrote:
> 
>> diff --git a/manual/filesys.texi b/manual/filesys.texi
>> index 0f2e3dc..181de76 100644
>> --- a/manual/filesys.texi
>> +++ b/manual/filesys.texi
>> @@ -2,6 +2,18 @@
>>  @c %MENU% Functions for manipulating files
>>  @chapter File System Interface
>>  
>> +@iftex
>> +@macro twoexp{exp}
>> +@math{2^{{\exp\}}}
>> +@end macro
>> +@end iftex
>> +@ifnottex
>> +@macro twoexp{exp}
>> +2^\exp\
>> +@end macro
>> +@end ifnottex
> 
> The macro definitions should go in macros.texi, rather than being 
> duplicated in each file using it.

It would also seem sensible to keep such macros near their uses,
and move them to macros.texi only if globally useful or repeated
more than some nominal number of times.

What if the macro was only used in one place? Would we still put
it into macros.texi?

Cheers,
Carlos.