[CMake] Building Multiple projects from a single CMakeList

[Michael Jackson]

You can have as many add_executable as you want.

Typically what you see is the project either just includes expat and  
builds it or offers the user the option of using a pre-built from the  
system (or some other location).

OPTION(USE_SYSTEM_EXPAT "Use an expat library supplied on the system"  
OFF)
IF (USE_SYSTEM_EXPAT)
  FindPackage(EXPAT)
  # Make sure expat was found
   if(NOT EXPAT_FOUND)
      message(FATAL_ERROR "Expat was NOT found and is needed")
   endif()
else(USE_SYSTEM_EXPAT)
   add_subdirectory(${My_Expat_Directory} ${PROJECT_BINARY_DIR}/Expat)
endif(USE_SYSTEM_EXPAT)

The above should get you started.

_________________________________________________________
Mike Jackson                  mike.jackson at bluequartz.net
BlueQuartz Software                    www.bluequartz.net
Principal Software Engineer                  Dayton, Ohio



On Jul 22, 2009, at 12:06 PM, ML wrote:

> Hi All,
>
> So my learning is going ok so far.
>
> My question right now is how might I check for the existence of a  
> previously build library. If it exists do nothing, if it does not  
> exist build it.
>
> My Example:
> 1. if libexpat.a exists in bin/ do nothing
> 2. if libexpat.a does not exist, my main project needs it, so build  
> it.
>
> Can I have a target called 'expat' and variable for the expat source  
> files, etc and another add_executable?
>
> Does anyone have a template?
>
> Best,
>
> -Jason
>
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