Howdy,
I'm looking to add a dependency to all source files to ensure that a generated
file is up-to-date before compilation. This generated file is "passed in" to
the compiler via a global compiler definition. Is there an easy or built-in way
to do this, or will I need to manually add a made-up target to every file in
every library directory?
Currently, the generated file is created in the CMake Options file, using an
exec_program command near the top of the file. The output of this process is
not tracked, but the GLOBAL_DEFS variable applied to every source file includes
a line that directs the compiler to consume the new file. It looks a little
like this:
Lib_options.cmake
[...]
exec_program(
<executable>
ARGS
-o <outputFile>
-I <inputFile>
-x <extraArgs...>
)
[...]
set (GLOBAL_DEFS
-D<definitions...>
-@<outputFile>
)
[...]
However, the dependency tree is not aware of this file and will not prepare it
in any way on a per-file bases. In this case the program is executed every
build regardless of if <inputFile> has been modified. This adds unnecessary
time to an incremental build if no change is made, and if <inputFile> does
happen to change CMake will not recompile the sources accordingly. I have to do
a clean/rebuild in order for the changes to "take".
What I would like to see is a way to actually add <outputFile> as a dependency
to each source file. Now, I'm no CMake expert, but I think it would look
something like this:
Lib_options.cmake
[...]
# Create a command/target for our output file
add_custom_command(
OUTPUT
<outputFile>
DEPENDS
<inputFile>
COMMAND
<executable>
ARGS
-o <outputFile>
-I <inputFile>
-x <extraArgs...>
)
# Do something to make all source files depend on <outputFile>
# <Magic goes here>
[...]
set (GLOBAL_DEFS
-D<definitions...>
-@<outputFile>
)
[...]
Would this be a feasible thing to do in CMake, especially at the options file
level? If you need any more information please let me know.
Thank you in advance!
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