6e59491659
Our custom command generation logic assumes that all command lines have
at least `argv0`. In `add_custom_{command,target}` we already check
that at least a `COMMAND` was given, but using `COMMAND_EXPAND_LISTS` in
combination with a generator expression that expands to an empty string
may produce an empty command line. In this case simply add an empty
string as a command to maintain our internal invariant.
Fixes: #17993
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| .. | ||
| BadTargetName-result.txt | ||
| BadTargetName-stderr.txt | ||
| BadTargetName.cmake | ||
| ByproductsNoCommand-result.txt | ||
| ByproductsNoCommand-stderr.txt | ||
| ByproductsNoCommand.cmake | ||
| CMakeLists.txt | ||
| CommandExpandsEmpty.cmake | ||
| NoArguments-result.txt | ||
| NoArguments-stderr.txt | ||
| NoArguments.cmake | ||
| RunCMakeTest.cmake | ||
| TargetOrder.cmake | ||
| UsesTerminalNoCommand-result.txt | ||
| UsesTerminalNoCommand-stderr.txt | ||
| UsesTerminalNoCommand.cmake | ||