You're probably missing the BUILD_ALWAYS option to ExternalProject_Add:
|BUILD_ALWAYS <bool>|
Enabling this option forces the build step to always be run. This
can be the easiest way to robustly ensure that the external
project’s own build dependencies are evaluated rather than relying
on the default success timestamp-based method. This option is not
normally needed unless developers are expected to modify something
the external project’s build depends on in a way that is not
detectable via the step target dependencies (e.g. |SOURCE_DIR| is
used without a download method and developers might modify the
sources in |SOURCE_DIR|).
Am 24.09.19 um 15:23 schrieb hex:
hello,
I have a problem with a build step.
The following command is run every time somefile changes:
add_custom_command( OUTPUT out.put
COMMAND touch out.put
DEPENDS somefile.txt
)
add_custom_target( sometarget DEPENDS out.put )
I move this snippet inside an external project (with
ExternalProject_Add) and the custom command is only run once at build.
I am using absolute path to somefile, the command is not rebuild
changing somefile.
I am using Gnu make generator and build with make all
What am I missing?
--
*Dr. Eric Dönges*
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