[CMake] append command

[Alan W. Irwin]

On 2011-08-11 20:34+0200 Michael Wild wrote:

> On 08/11/2011 07:39 PM, Alan W. Irwin wrote:
>> On 2011-08-11 17:20+0200 Michael Wild wrote:
>>
>>> How about
>>>
>>> string(APPEND " /newstuff" xyz)
>>>
>>> It is not satisfactory in that it doesn't follow the semantics of all
>>> the other string(...) commands which never modify their input.
>>
>> I like that idea, but I would generalize it as
>>
>> string(APPEND <string> <output_variable> <input> [<input>...])
>>
>> to make it similar to other string commands.
>>
>> BUT if no input is given take it from "${output_variable}" just as
>> for your suggestion.
>>
>> I would also make that same change for all other string commands of
>> the same form, i.e., the various REGEX and REPLACE commands.  For those, I
>> find the input string is often "${output_variable}" so I believe this
>> generalization would be a useful convenience for all users of those
>> string subcommands.  Furthermore, even though this generalization of
>> REGEX et all is a major change, IIRC you get a wrong number
>> of arguments now for, e.g.,
>>
>> string(REGEX REPLACE <regular_expression> <replace_expression> <output
>> variable>)
>>
>> so I believe this generalization would be backwards compatible.
>>
>> Alan
>
> Making the <string> argument optional is not possible....

Please reread what I wrote above.  <string> is not optional.
It is <input> that would be optional.  And similarly for
REGEX and friends.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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