[CMake] How about GNU Automatic Variables

[J Decker]

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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