[CMake] Quick question about set and substitutions

[Ryan Pavlik]

Your "project" command should always be the first or second (after
cmake_minimum_required) command in your root CMakeLists.txt file, unless you
have a very good reason.

Then, on the topic of definitions, this is all you need:
add_definitions("-DLIBRARY_NAME=\"${YOUR_CMAKE_VAR_WITH_LIB_NAME}\"")

before you add your target (add_library, etc) - CMake will automatically
pull the var=value part out, and do quoting appropriate for your compiler.
see also:
http://cmake.org/cmake/help/cmake-2-8-docs.html#prop_tgt:COMPILE_DEFINITIONS
 (for
details and/or another way to achieve the same result, but in a more
fine-grained, per-target way that probably is appealing given your goal)

I was hoping that there was an easy solution - hope this helps!

Ryan

On Thu, Sep 16, 2010 at 8:42 PM, J Decker <d3ck0r at gmail.com> wrote:

> On Thu, Sep 16, 2010 at 6:30 PM, Ryan Pavlik <rpavlik at iastate.edu> wrote:
> > Why are you trying to do this before the project command?
>
>
> To result in a shorthand that I don't HAVE to copy and paste; because
> definition of compiler requirements for passing definitions that are
> string literals is lacking?
>
>
> You can set the
> > target name to be something different from the project name, and you can
> > even set the output name of the executable/library to be different than
> what
> > would be automatically set by default from the target name.
>
>
> Sure... but I don't; so it would be a reasonable shorthand within this
> source domain.
>
>
> (I've done
> > this, to embed the platform into the code and/or output name)
> > My guess: you've done a lot of work with makefiles and the C
> preprocessor.
> > It looks like you're overthinking it - CMake is a reasonably high-level
> > scripting language, not a macro language or preprocessor.
>
>
> Maybe :) That's really the question though - how is this not what I want?
>
>
> > Could you share a high-level intended behavior with the list so we might
> be
> > able to give you a more satisfying answer?
>
>
> In the end, during compilation I want to define a 'variable' that IS
> the name of the library itself.  That name is usually only passed to
> the linker.  different compilers have different syntax for defining
> string literals like
>
> #define TARGET_NAME "MyLibrary.Dll"
>
> I don't want to define the name in two places, I want it to be
> definitively the project name, because why would it be any other name
> in a new development?
>
> gcc[ld] -DTARGET_NAME="\"libsack.so\"" -o libsack.so <sources>
>
> wcc[wlink] -DTARGET_NAME="libsack.so" -o sack.dll <sources>
>
> /* I'm not sure about this one... it might be like gcc, but it may be
> version dependant also */
> mc[link] -DTARGET_NAME="libsack.so" -o sack.dll <sources>
>
> Since there is no definition in CMAKE for the quote to use to define a
> string literal to a definition...
>
> I think is the syntax to define a macro on the command line that has
> spaces, not strings... really probably openwatcom is broken.
>
> "-DOtherMacro 1+2=3"
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-- 
Ryan Pavlik
HCI Graduate Student
Virtual Reality Applications Center
Iowa State University

rpavlik at iastate.edu
http://academic.cleardefinition.com
Internal VRAC/HCI Site: http://tinyurl.com/rpavlik
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