[CMake] Question about add_custom_command

[Michael Wild]

On 10. Sep, 2010, at 12:38 , David Aldrich wrote:

> Hi Michael
> 
> Thanks for your help. Please see question below.
> 
>> CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
>> PROJECT(GENDEP C)
>> FILE(WRITE ${CMAKE_BINARY_DIR}/g.c "void g(void){}\n")
>> ADD_CUSTOM_COMMAND(
>>    OUTPUT ${CMAKE_BINARY_DIR}/f.c
>>    COMMAND echo "void f(void){}" > ${CMAKE_BINARY_DIR}/f.c
>>    DEPENDS ${CMAKE_BINARY_DIR}/g.c
>>    VERBATIM)
>> FILE(WRITE ${CMAKE_BINARY_DIR}/main.c "int main(void){f();return 0;}\n")
>> ADD_EXECUTABLE(main main.c f.c)
>> 
>> "f.c" is regenerated and, thus, "main" rebuilt if "g.c" is touched
>> although it's not incorporated in "main". 
> 
> In my case, the dependencies of the f.c will be all the dependencies of main. i.e. if any source file contributing to the exe changes we must first regenerate f.c.
> 
> Now our executable depends on many source files. I assume you are saying that I need to add the same list of dependencies to the ADD_CUSTOM_COMMAND. Can I specify a list of files further up in CMakeLists.txt so that I only need to enumerate the list once?
> 
> Regards
> 
> David

set(SRCS a.c b.c d.c e.c)

add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/f.c
  COMMAND ...
  DEPENDS ${SRCS}
  COMMENT "Generating f.c"
  VERBATIM)
list(APPEND SRCS ${CMAKE_BINARY_DIR}/f.c)

add_executable(main ${SRCS})


HTH

Michael

--
There is always a well-known solution to every human problem -- neat, plausible, and wrong.
H. L. Mencken

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