Review Request 127432: ecm_qt_declare_logging_category: improve error message when using without including

[David Faure]

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https://git.reviewboard.kde.org/r/127432/
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Review request for Extra Cmake Modules and Stephen Kelly.


Repository: extra-cmake-modules


Description
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If one subdir in the project includes this file, all others can use the function
but they don't see the value of the variable, which leads to a strange error

CMake Error at ECM/modules/ECMQtDeclareLoggingCategory.cmake:114 (configure_file):
  configure_file input location <srcdir> is a directory but a file was expected.

Happened in KIO, with kio/gui doing include+function call, and then adding
function call in kio/widgets.


Diffs
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  modules/ECMQtDeclareLoggingCategory.cmake 3f7bb79a7f4d98c1480f87b1fffc252f4e159add 

Diff: https://git.reviewboard.kde.org/r/127432/diff/


Testing
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As described in above. Got the better error message after the fix.


Thanks,

David Faure

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