[CMake] append command

[Alan W. Irwin]

On 2011-08-11 16:46-0400 David Cole wrote:

> I share Alex's confusion with your proposed signature. All other string subcommands refer to either "<string>" or "<input>" in their args
> list. None of them have both "<string>" *and* "<input>".

Sorry I should have been more explicit.  The current signatures for
REGEX et al are

string(REGEX MATCH <regular_expression>
       <output variable> <input> [<input>...])
string(REGEX MATCHALL <regular_expression>
        <output variable> <input> [<input>...])
string(REGEX REPLACE <regular_expression>
        <replace_expression> <output variable>
        <input> [<input>...])
string(REPLACE <match_string>
        <replace_string> <output variable>
        <input> [<input>...])

What I am suggesting for all of them is to make <input> [<input>...])
optional.  When that is not supplied, the input would be taken
from "${<output variable>}" instead.  And similarly for

string(APPEND or CONCAT "<string>" <output variable>
        <input> [<input>...])

Hope that makes clear what I am proposing.

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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