[cmake-developers] [CMake 0011888]: Using external inputs to any build commands results in broken dependencies

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=11888 
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Reported By:                litghost
Assigned To:                
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Project:                    CMake
Issue ID:                   11888
Category:                   CMake
Reproducibility:            always
Severity:                   major
Priority:                   high
Status:                     new
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Date Submitted:             2011-02-22 16:57 EST
Last Modified:              2011-02-22 16:57 EST
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Summary:                    Using external inputs to any build commands results
in broken dependencies
Description: 
Using FILE(READ or variants to read in inputs to any build commands (i.e.
add_definitions) results does not result in build system dependencies.  There
does not appear to be a way to add a dependency on the build system to external
files.

Steps to Reproduce: 
See attached example.  

Imagine an external command writes the "defines.txt" which is a newline
separated list of definitions.  I want the CMake build system to see that
defines.txt is newer than the last reconfiguration and regenerate the definition
list.

Steps to reproduce with example:
1. Extract attached tar
2. Run "cmake ." in the directory with the extracted files
3. Run "make" command and observe the expected error "TEST_DEFINED not defined"
4. Append TEST_DEFINED to defines.txt (echo "TEST_DEFINED" >> defines.txt)
5. Run "make" command and observe that the error has not gone away, even though
the definition is now listed in defines.txt because the CMake system has not
re-read "defines.txt"
6. Touch CMakeLists.txt and run make.  Observe that the error has gone away
because the CMake system re-read "defines.txt" during the config pass.
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Issue History 
Date Modified    Username       Field                    Change               
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2011-02-22 16:57 litghost       New Issue                                    
2011-02-22 16:57 litghost       File Added: test.tar                         
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