[CMake] Problems with auto-generated sources

[Williams, Norman K]

I was under the impression that target_link_libraries implicitly mad the
target depend on all mentioned libraries.

Calling the custom command and library build twice during parallel builds
is just wrong.  If it's a known problem, it probably requires addressing
at some point.

Does this problem extend to other build systems or just gnu make?  Is
CMake generating bad Makefiles?

I would think that it should generate something like this, which will not
run into duplicate builds in parallel.

file.c : org.c
        cmake -E remove file.c
        cmake -E copy org.c file.c

libLibfile.a : file.o
        $(AR) $(ARFLAGS) libLibfile.a file.o

test1 : test.o libLibfile.a
        cc -o test1 test.o -lLibFile
test2 : test.o libLibfile.a
        cc -o test2 test.o -lLibFile


On 10/1/13 6:38 AM, "Gregor Jasny" <gjasny at googlemail.com> wrote:

>Hello,
>
>On 9/30/13 7:19 PM, Williams, Norman K wrote:
>> ========================================================================
>> cmake_minimum_required(VERSION 2.8)
>> project(Test)
>>
>> add_custom_command(OUTPUT file.c
>>      COMMAND echo "GENERATING FILE"
>>      COMMAND ${CMAKE_COMMAND} -E remove file.c
>>      COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/org.c
>> file.c
>>      DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/org.c
>>    )
>> add_library(LibFile file.c)
>>
>> add_executable(test1 test.c)
>> target_link_libraries(test1 LibFile)
>>
>> add_executable(test2 test.c)
>> target_link_libraries(test2 LibFile)
>>
>>
>> ========================================================================
>
>Please try to add these two lines:
>
>add_dependencies(test1 LibFile)
>add_dependencies(test2 LibFile)
>
>This helped to solve my dependencies problem.
>
>Thanks,
>Gregor
>
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