[cmake-developers] [SOLVED]DESTDIR does not work correctly with install(FILES ... signature

[Eric Noulard]

2013/1/8 Alan W. Irwin <irwin at beluga.phys.uvic.ca>:
> On 2013-01-08 10:47+0100 Eric Noulard wrote:
>
>> 2013/1/8 Alan W. Irwin <irwin at beluga.phys.uvic.ca>:
>
>
>> The rule should be simple as:
>>
>> You need to escape one time less than the number of cmake run occuring
>> through the workflow path.
>> In your case you have to escape once because install(CODE ...) is
>> processed **by cmake**
>> at "Install time" and you expect the evaluation to take place at that
>> time.
>>
>> The may-be tricky part is "when" cmake (or derived cmake script engine
>> is running)
>> the "running time" of cmake tool suite may not be obvious and I tried
>> to picture it in
>> a tutorial (see excerpt attached to this mail)
>>
>> May be we can document common uses cases:
>>
>> install(CODE  --> one escape
>> install(SCRIPT --> none
>>
>> add_custom_command/target --> one or two level escape depending on the
>> arguments
>>
>> with various combination where you may "configure_file"
>>  1) yourself  before using "install(SCRIPT ..." --> my way of work
>>        usually one escape level.
>>
>>  2) through CPack like values used in CPACK_xxx variable which end up
>>       in some CPack template file which are processed first  at CMake-time
>> and
>>       may be again at CPack-time. This one may lead to 2 level escape.
>>
>
> Don't forget the example of code like this:
>
> set(CPACK_SOURCE_IGNORE_FILES
>   "\\\\#*\\\\#$"
>   "^${PROJECT_SOURCE_DIR}.*/\\\\.svn/"
>   ....
>
> I have been wrong about overcomplicating escapes in the past, but I
> think it this case, 4 levels of escapes are really necessary for these
> particular regex expressions.  Anyhow, I know this code works, but I
> don't know why!  Does your simple rule above explain this, and if so how?

In my mind this sequence is a two-level one
but you need four '\' because backslash **itself** need to be  escaped
at both level.

level 1 = when cmake runs
level 2 = when cpack runs and process CPACK_SOURCE_IGNORE_FILES.

in the end you need to get '\.' so you need \\. at level 1 output thus
\\\\. in the CMakeLists.txt

-- 
Erk
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