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 [email protected]
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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