Is it possible to configure a file at build time?

Usage
1

Hi All,

Is it possible to configure a file at build time?

I want the functionality that configure_file provides but I need it to run after another set of files have been generated.

I already have a custom command that generates a set of files. I then need to create another set of files based off a .in file.

is it possible to do something like this?

# run the first add_custom_command
# set some variables based on the content of the generated files
# run add_custom_command again to create another file based of the source controlled wrapper.h.in

add_custom_command(
   OUTPUT    wrapper.h
   COMMAND  <cmake configure_file feature> wrapper.h.in  wrapper.h
   DEPENDS wrapper.in.h
2

This function I wrote years ago can do what you want. You do need to list all variables you want to be able to use as they’re not otherwise available.

3

You can run cmake scripts at build time with the -P command line argument.

If you need variables from cmake configure time in that cmake script, just make it a .cmake.in file and use configure_file() to prepare it, maybe with @ONLY parameter to not get confused with replaced variables and script-internal variables.