Alan W. Irwin wrote:
Also, as part of the investigation I found that preparing the header
in one
subdirectory with the custom command and putting that header in the
source
list of a library built in a different subdirectory does not work. The
library build in the separate subdirectory has no idea that the header is
generated, and therefore errors out with a missing file message. I
therefore stuck with my original method which was to use
ADD_DEPENDENCIES to
make the library depend on the custom target, and that seems to work
fine.
One thing to watch out for is make -j N builds where N > 1. Currently,
you have to
hack around a problem in CMake to get that to work in a situation like this.
You have to create a custom_target that creates the .h file. Then use
add_dependencies to make sure that custom target is build before the
other targets that depend on it. The problem only shows up when building
static libraries.
-Bill
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