[CMake] MSBuild and automatic project file regenation

[Michael Hertling]

On 02/09/2012 05:35 PM, Bill Hoffman wrote:
> I took a look at this, and it is behaving as expected with VS.  VS does 
> NOT have a depend on compile flags.  You can change a .vcproj file and 
> the flags it uses all you want, and VS will NOT rebuild any files 
> because of that.

OK, I see. So, it's a shortcoming of VS, if I understand correctly: No
dependency of object files on project files, and I guess that this is
not amendable by the means of CMake.

> So, as far as VS is concerned your source file has not changed and does 
> not need to rebuild.  I modified your example and --build works 
> perfectly (I change the NUMBER in the CMakeLists.txt and main is rebuilt 
> with one invocation of cmake --build .)
> 
> 
> 
> CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
> PROJECT(BUILD C)
> FILE(WRITE ${CMAKE_BINARY_DIR}/main.c "#include <stdio.h>
> #include <main.h>
> int main(void)
> {
>    printf(\"%d\\n\",NUMBER);
>    return 0;
> }
> ")
> include_directories(${CMAKE_BINARY_DIR})
> ADD_EXECUTABLE(main main.c)
> set(NUMBER 2)
> configure_file(main.h.in main.h)
> 
> 
> $ cat ../main.h.in
> #define NUMBER @NUMBER@

I.e., in order to trigger a rebuild with VS, an actual change in the
sources must have taken place - good to know. Many thanks, Bill and
Aaron, for spending time on this issue.

Regards,

Michael