On 2018-04-13 23:02+0200 Nils Gladitz wrote:

On 13.04.2018 21:48, Alan W. Irwin wrote:
However, that is wrong since that command currently needs two arguments even if
one of them is empty.  So instead I need the generated command to be

./test-drv-info "temporary_target_" ps > /home/software/plplot/HEAD/build_dir/drivers/test_dyndrivers_dir/ps.driver_info


./test-drv-info "" ps > /home/software/plplot/HEAD/build_dir/drivers/test_dyndrivers_dir/ps.driver_info

depending on how LIBRARY_TARGET_PREFIX is set.

Is it possible to implement that?

Hi Alan,

with VERBATIM just using regular unescaped quotes (which are cmake syntax and not part of the value) around the argument should work e.g.

    COMMAND test-drv-info "${LIBRARY_TARGET_PREFIX}" ${SOURCE_ROOT_NAME} ${CMAKE_CURRENT_BINARY_DIR}/test_dyndrivers_dir/${SOURCE_ROOT_NAME}.driver_info

That way even when ${LIBRARY_TARGET_PREFIX} expands empty add_custom_command() will receive an argument which it will escape / quote as required by the build system.

Hi Nils:

When starting fresh with a clean cache using
"${LIBRARY_TARGET_PREFIX}" in the COMMAND worked perfectly, i.e.,
propagated as "" to the command line when ${LIBRARY_TARGET_PREFIX}
expands empty. Thanks for that suggestion!

The strange thing is I am virtually positive I tried that exact idea
earlier today, and it did not work, but maybe that was due to another
issue such as a dirty cache.

Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).

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