MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0014756CMakeCMakepublic2014-02-14 14:202016-06-10 14:31
ReporterBen Boeckel 
Assigned ToKitware Robot 
PrioritynormalSeverityfeatureReproducibilityhave not tried
StatusclosedResolutionmoved 
PlatformOSOS Version
Product VersionCMake 3.1 
Target VersionFixed in Version 
Summary0014756: RFE: Report changes to cached values
DescriptionAdd a variable to CMake such that it will report when a cached variable's value is different from the default being set. For example:

    set(var dflt CACHE STRING "description")

could output:

    path/to/CMakeLists.txt:42: var 'dflt' -> 'cachedvalue'

and could also, at the end of configure, print out a command line (or initial cache file) to be used to duplicate the build on another machine. I was thinking of 'CMAKE_REPORT_DELTA' as the control variable.

Came up from a gn thread: https://groups.google.com/a/chromium.org/d/msg/gn-dev/la6vwV3x-o4/hkJJ78a7rqwJ [^]
Steps To Reproduce
Additional Information
TagsNo tags attached.
Relationships
related to 0014546closed Kitware Robot CACHE variables persist through reruns 
Attached Files
Issue History
Date ModifiedUsernameFieldChange
2014-02-14 14:20Ben BoeckelNew Issue
2014-02-14 15:34Brad KingRelationship addedrelated to 0014546
2014-02-14 15:38Brad KingNote Added: 0035112
2016-06-10 14:29Kitware RobotNote Added: 0042487
2016-06-10 14:29Kitware RobotStatusnew => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0035112)
Brad King   
2014-02-14 15:38   
Note that in Modules/CMakeGenericSystem.cmake we do:

 if(NOT DEFINED CMAKE_INSTALL_PREFIX)
   set(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT 1)
 endif()
 ...
   set(CMAKE_INSTALL_PREFIX "/usr/local" CACHE PATH "...")
 ...

so that applications can know when they can force a different default for CMAKE_INSTALL_PREFIX without overriding a user setting.

This could be generalized for use with all cache entries. It would be helpful for projects that want to override the default CMAKE_C_FLAGS_DEBUG, for example, without needing to use CMAKE_USER_MAKE_RULES_OVERRIDE and a separate file.

See also discussion in 0014546.
(0042487)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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