MantisBT - CMake |
| View Issue Details |
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| ID | Project | Category | View Status | Date Submitted | Last Update |
| 0016056 | CMake | CMake | public | 2016-04-08 13:18 | 2016-06-10 14:21 |
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| Reporter | johnnyzz | |
| Assigned To | | |
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | no change required | |
| Platform | | OS | | OS Version | |
| Product Version | CMake 3.5.1 | |
| Target Version | | Fixed in Version | | |
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| Summary | 0016056: file(GENERATE) not processing variables from INPUT file |
| Description | There is a bug when generating a file with:
file(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/output1.txt"
INPUT ${CMAKE_SOURCE_DIR}/input.txt
)
file(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/output2.txt"
CONTENT "SOURCE DIR = '${CMAKE_SOURCE_DIR}'"
)
- Using "INPUT filename", variables are not processed, but "CONTENT text" with the same content works properly |
| Steps To Reproduce | 1) cmake .
2) cat output1.txt
3) cat output2.txt
-> The variable in output1.txt is not replaced by its value |
| Additional Information | |
| Tags | No tags attached. |
| Relationships | |
| Attached Files |  CMakeLists.txt (270) 2016-04-08 13:18
https://public.kitware.com/Bug/file/5671/CMakeLists.txt
input.txt (35) 2016-04-08 13:19
https://public.kitware.com/Bug/file/5672/input.txt |
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| Issue History |
| Date Modified | Username | Field | Change |
| 2016-04-08 13:18 | johnnyzz | New Issue | |
| 2016-04-08 13:18 | johnnyzz | File Added: CMakeLists.txt | |
| 2016-04-08 13:19 | johnnyzz | File Added: input.txt | |
| 2016-04-08 13:27 | Brad King | Note Added: 0040830 | |
| 2016-04-08 13:27 | Brad King | Status | new => resolved |
| 2016-04-08 13:27 | Brad King | Resolution | open => no change required |
| 2016-04-08 13:30 | Brad King | Note Added: 0040831 | |
| 2016-04-08 14:01 | johnnyzz | Note Added: 0040832 | |
| 2016-06-10 14:21 | Kitware Robot | Note Added: 0041198 | |
| 2016-06-10 14:21 | Kitware Robot | Status | resolved => closed |
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Notes |
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(0040830)
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Brad King
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2016-04-08 13:27
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file(GENERATE) does not document that it expands variables. It doesn't expand them in either case. In fact it is not well-defined to do so because the generation does not occur until after configuration is complete when the variable definitions may no longer be available.
The difference you're seeing is the CMake language processing that expands variables in the argument to CONTENT before the file(GENERATE) command even sees it.
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(0040831)
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Brad King
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2016-04-08 13:30
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> CMake language processing that expands variables in the argument to CONTENT
One can see this by using a bracket argument instead:
file(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/output2.txt"
CONTENT [[SOURCE DIR = '${CMAKE_SOURCE_DIR}']]
)
Bracket-enclosed arguments have no substitutions done by the language processing.
You could consider using configure_file first to replace variables and then use its output as the INPUT to file(GENERATE). |
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(0040832)
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johnnyzz
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2016-04-08 14:01
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Well, I see it now, thanks, my intention was to store the input template separately.
The configure_file looks what I'm looking for.
Anyway, documentation states that it can expand "generator expressions", so I thought it can/could do the same with variables |
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(0041198)
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Kitware Robot
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2016-06-10 14:21
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