[CMake] [RFC] cmake analog to AC_SEARCH_LIBS

[Игорь Пашев]

Having two variables is an advantage over autoconf:

HAVE_FOO is true if the function is found at all
FOO_LIB is a library where foo is found.

HAVE_FOO may be true, but FOO_LIB is empty, if the function foo is in libc

I can add ${FOO_LIB} to targets where I need foo; with autotools the
library containing foo
is added to all targets.


Here is how I use it:

CMAKE_SEARCH_LIBS (HAVE_DLADDR LIB_DLADDR dladdr dl)
if (NOT HAVE_DLADDR)
    message (FATAL_ERROR "Cannot find library providing dladdr()")
endif()

CMAKE_SEARCH_LIBS (HAVE_PTHREAD_JOIN LIB_PTHREAD pthread_join pthread)
if (NOT HAVE_PTHREAD_JOIN)
    message (FATAL_ERROR "Cannot find library providing pthread_join()")
endif()

MY_LINK_LIBRARIES (aaa
    ${LIB_DLADDR}
    ${LIB_PTHREAD}
    dwarf
    lzma
    )

2013/9/9 Stewart, Robert <Robert.Stewart at sig.com>:
> Игорь Пашев wrote:
>>
>> Hi, all. I'm using this macro to get AC_SEARCH_LIBS (from GNU
>> autoconf) functionality with CMake.
>>
>> First of all, this macro searhes the function on libc, then,
>> if not found, in the given libraries. It sets two variables:
>> 1) boolean if function  found
>> 2) string - in which library (may be empty).
>>
>> I'd like this macro to be in standard cmake set.
>
> Regardless of anything else in your proposal, why the two result
> variables?  It seems to me that setting the string when found,
> and clearing it when not, serves both purposes.  When the string
> is empty, the function wasn't found.
>
>> MACRO (CMAKE_SEARCH_LIBS v_func v_lib func)
>
> (I don't know what the "v_" prefix means, but I presume that those
> arguments are the outputs, so perhaps "v_" means "supply the name
> of a variable to set.")  With my variation, the interface would
> work like the following:
>
> CMAKE_SEARCH_LIBS(library my_function)
> IF(library)
>    # found my_function's library
> ENDIF()
>
>
> _____
> Rob Stewart
> Software Engineer
> Dev Tools & Components
> Susquehanna International Group, LLP
>
> ________________________________
>
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