[CMake] Help including dylib into cmake build for xcode

[Frankie Chan]

It looks like i got it to work, you were right on the target being empty. Thx!

-----Original Message-----
From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of Frankie Chan
Sent: June-03-13 10:23 AM
To: Andreas Mohr; cmake at cmake.org
Subject: Re: [CMake] Help including dylib into cmake build for xcode

Maybe this will clear up what i was trying to do and how i got to that error.
Basically i was trying to use this macro to search for sqlite3:

macro (FindSQLite3)
# Look for the library.
	# find_path(SQLITE3_INCLUDE_DIR NAMES libsqlite3)

	find_path(SQLITE3_INCLUDE_DIR NAMES sqlite3.h)

	find_library(SQLITE3_LIBRARY NAMES libsqlite3)

	# Handle the QUIETLY and REQUIRED arguments and set SQLITE3_FOUND to TRUE if all listed variables are TRUE.
	include(FindPackageHandleStandardArgs)
	find_package_handle_standard_args(SQLITE3 DEFAULT_MSG SQLITE3_LIBRARY SQLITE3_INCLUDE_DIR)

	# Copy the results to the output variables.
	if (SQLITE3_FOUND)
		set (SQLITE3_LIBRARIES ${SQLITE3_LIBRARY})
		set (SQLITE3_INCLUDE_DIRS ${SQLITE3_INCLUDE_DIR})
		message(SQLite3 Found ${SQLITE3_INCLUDE_DIRS} ${SQLITE3_LIBRARY})
	else (SQLITE3_FOUND)
		set (SQLITE3_LIBRARIES)
		set (SQLITE3_INCLUDE_DIRS)
		message(SQLite3 not Found)
	endif (SQLITE3_FOUND)

	mark_as_advanced (SQLITE3_INCLUDE_DIRS SQLITE3_LIBRARIES)
endmacro()

But like you mention before perhaps my target is empty..

-----Original Message-----
From: Andreas Mohr [mailto:andi at lisas.de] 
Sent: June-01-13 2:35 PM
To: cmake at cmake.org
Cc: Frankie Chan
Subject: Re: Help including dylib into cmake build for xcode

Hi,

On Sat, Jun 01, 2013 at 12:00:04PM -0400, cmake-request at cmake.org wrote:
> Date: Fri, 31 May 2013 15:12:10 -0400
> From: Frankie Chan <frankie.chan at ubisoft.com>

Ah, I just realized that I failed to reply to the most current mail ;)


> I get the following error, i am kinda stumped right now since I am not exactly sure if this is the right approach in linking my project.
> 
>   Cannot specify link libraries for target "/usr/lib/libsqlite3.dylib" which
>   is not built by this project.
> 
>   CMake does not support this but it used to work accidentally and is being
>   allowed for compatibility.
> 
>   Policy CMP0016 is not set: target_link_libraries() reports error if only
>   argument is not a target.  Run "cmake --help-policy CMP0016" for policy
>   details.  Use the cmake_policy command to set the policy and suppress this
>   warning.
> This warning is for project developers.  Use -Wno-dev to suppress it.

This can mean (with deadly precision) nothing other than ${Target} having ended up as an empty expression, thus the sqlite3 argument
(/usr/lib/libsqlite3.dylib) ends up being the *first* argument of the call which is supposed to be the candidate target instead.
IOW, FUBAR.

Perhaps ${Target} variable has a case sensitivity issue? Scope issue? (perhaps some outer scope defined it yet now we're in a foreign unrelated scope?
Different directory, different function, ...).

Anyway, always use
message(FATAL_ERROR "exact_same_cmake_line_content_as_executed")
(or, IOW,
message(FATAL_ERROR "target_link_libraries(${Target} ${SQLITE3_LIBRARIES})")
)
whenever needing to analyze why things fail.

Andreas Mohr
--

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