The tests-if-CYGWIN topic made a change to Tests/Testing/CMakeLists.txt
in code that the custom-command-generator-expressions topic moved to the
Tests/PerConfig/CMakeLists.txt file. Make the same change to the same
content in the new file. (Only a small part of the file moved so rename
detection did not do this automatically.)
Evaluate in the COMMAND arguments of custom commands the generator
expression syntax introduced in commit d2e1f2b4 (Introduce "generator
expressions" to add_test, 2009-08-11). These expressions have a syntax
like $<TARGET_FILE:mytarget> and are evaluated during build system
generation. This syntax allows per-configuration target output files to
be referenced in custom command lines.
Put the source files, build rules, and test scripts for these targets
under Tests/PerConfig and refer to it from Tests/Testing as a
subdirectory. The targets and scripts will be useful in other tests.
