[CMake] How about GNU Automatic Variables

[Domen Vrankar]

I was curious and I looked a bit further:
http://www.cmake.org/cmake/help/v3.0/command/add_library.html has a
OBJECT target that perhaps you could use instead of static library.

http://www.cmake.org/cmake/help/v3.0/command/set_property.html also
has a SOURCE option that I haven't mentioned before because I'm not
certain how to produce two differently named .o files but maybe you'll
be able to figure that out...

Regards,
Domen


2014-11-29 10:31 GMT+01:00 Domen Vrankar <domen.vrankar at gmail.com>:
> Hi,
>
> I haven't tested this but I think you could write something like this:
>
> add_library(test_single test.c)
> set_property(
>    TARGET test_single
>    PROPERTY COMPILE_DEFINITIONS DOUBLE=some_val
> )
> add_library(test_double test.c)
> set_property(
>    TARGET test_double
>    PROPERTY COMPILE_DEFINITIONS DOUBLE=some_other_val
> )
>
> and then link the static libraries to an executable.
>
> As far as I know you could also use
> set_target_properties(test_single PROPERTIES COMPILE_DEFINITIONS
> DOUBLE=some_val)
> but I'm not certain what the difference is... Probably back compatibility...
>
> Hope this helps,
> Domen
>
>
>
> 2014-11-29 9:27 GMT+01:00 Zhang Xianyi <traits.zhang at gmail.com>:
>> Hi Decker,
>>
>> Thank you for the answer.
>>
>> If I want to debug test_double, the debugger will refer to
>> ${CMAKE_BINARY_DIR}/test_double.c.
>> I am not sure it is appropriate to debug a generated file.
>>
>>
>> Xianyi
>>
>> 2014-11-28 23:03 GMT+08:00 J Decker <d3ck0r at gmail.com>:
>>>
>>>
>>>
>>> On Fri, Nov 28, 2014 at 1:29 AM, Zhang Xianyi <traits.zhang at gmail.com>
>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> I want to use cmake for a library which supports different floating point
>>>> precision.
>>>>
>>>> In Makefile, I used $(*F)  to generate the different function name.
>>>>
>>>> Could I use $(*F) in cmake?
>>>>
>>>>
>>>> ==================
>>>>
>>>> test.c
>>>>
>>>> ===============
>>>>
>>>> #ifdef DOUBLE
>>>>
>>>> #define TYPE double
>>>>
>>>> #else
>>>>
>>>> #define TYPE float
>>>>
>>>> #endif
>>>>
>>>>
>>>> void CNAME(TYPE * a)
>>>>
>>>> {
>>>>
>>>>   a[0]=1.0;
>>>>
>>>> }
>>>>
>>>>
>>>
>>> CMakeLists.txt
>>> ====================
>>>  cmake_minimum_required(VERSION 2.8)
>>>
>>>        add_custom_command( OUTPUT ${CMAKE_BINARY_DIR}/test_double.c
>>>                            DEPENDS test.c
>>>                            COMMAND ${CMAKE_COMMAND} -E copy_if_different
>>> test.c   ${CMAKE_BINARY_DIR}/test_double.c
>>>                            COMMAND ${CMAKE_COMMAND} -E touch
>>> ${CMAKE_BINARY_DIR}/test_double.c
>>>                            )
>>>
>>>
>>> add_library( libtest   test.c  ${CMAKE_BINARY_DIR}/test_double.c )
>>>
>>> SET_PROPERTY(SOURCE ${CMAKE_BINARY_DIR}/test_double.c
>>>                  APPEND
>>> PROPERTY COMPILE_DEFINITIONS "DOUBLE" )
>>>
>>> ======================
>>>
>>>> ===========
>>>>
>>>> Makefile
>>>>
>>>> ================
>>>>
>>>> OBJS=test_single.o test_double.o
>>>>
>>>> all:$(OBJS)
>>>>
>>>>       ar -rua libtest.a $(OBJS)
>>>>
>>>> test_single.o : test.c
>>>>
>>>>         $(CC) -DCNAME=$(*F) -UDOUBLE -c $< -o $(@F)
>>>>
>>>> test_double.o : test.c
>>>>
>>>>         $(CC) -DCNAME=$(*F) -DDOUBLE -c $< -o $(@F)
>>>>
>>>>
>>>> ============
>>>>
>>>> Thank you
>>>>
>>>> Xianyi
>>>>
>>>>
>>>> --
>>>>
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>>
>>
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>>
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