[CMake] how to build library for this..

[Philip Lowman]

On Thu, Jan 29, 2009 at 11:38 PM, ankit jain <ankitguddu at gmail.com> wrote:

>
>
> 2009/1/29 Pau Garcia i Quiles <pgquiles at elpauer.org>
>
>>  On Thu, Jan 29, 2009 at 1:12 PM, ankit jain <ankitguddu at gmail.com>
>> wrote:
>> > hi all,
>> >
>> > Problem:
>> >
>> > libA : A/foo.cc
>> > libB : B/bar.cc
>> > and a 3rd library:
>> > libC : A/foo.cc B/bar.cc
>> > ?
>> >
>> > here i build the libraries for A and B but not able to build lib for C .
>> > Guide me to do that. What should be the content of cmakelist file of C
>> to
>> > create lib C
>> >
>> > here A and B are sub folders of C
>>
>> Do you ean you are trying this but it's not working?
>>
>> ADD_LIBRARY (libA A/foo.cc )
>> ADD_LIBRARY (libB B/bar.cc )
>> ADD_LIBRARY (libC libA libB )
>>
>> That fails because CMake does not support convenience libraries:
>>
>> http://www.cmake.org/Wiki/CMake_FAQ#Does_CMake_support_.22convenience.22_libraries.3F
>>
>> You need to do this:
>>
>> ADD_LIBRARY (libA A/foo.cc )
>> ADD_LIBRARY (libB B/bar.cc )
>> ADD_LIBRARY (libC A/foo.cc B/bar.cc )
>>
>> I. e. list the source files for libC
>>
>> Is that what you want to do?
>>
>
> Dont you think so it will be too hectic if there are 10 folders inside
> folder C and each folder has around 10 C files each. then listing all will
> be really cumbersome.
> What should be the alternative for it.
>

Here's one idea, in A and B set a variable with all of the source files and
add them to the PARENT_SCOPE.

set(A_SRCS a.cc)
set(A_SRCS ${A_SRCS} PARENT_SCOPE)
add_library(A ${A_SRCS})

Then in the higher directory, use a foreach() loop to construct a proper
relative path to each source file:

foreach(fname ${A_SRCS})
    list(APPEND C_SRCS A/${fname})
endforeach()
foreach(fname ${B_SRCS})
    list(APPEND C_SRCS B/${fname})
endforeach()
add_library(both ${C_SRCS})

-- 
Philip Lowman
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