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Date Submitted

Last Update

0014701

CMake

public

2014-01-15 05:17

2014-06-02 08:38

Reporter

Andreas Pakulat

Assigned To

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

won't fix

Platform

OS Version

Product Version

CMake 2.8.12.1

Target Version

Fixed in Version

Summary

0014701: check_include_file never re-runs because it use the variable as cache

Description

When using check_include_file to verify a certain header can be used, the result of the try_compile is cached by check_include_file using the same variable that is passed in to check_include_file. This means a second run of cmake will not run the try-compile again because the variable is already defined and hence the check at the top of check_include_file goes into the else branch.

This breaks the common idiom of running cmake for a project to find out which dependencies might be missing, then installing needed dependencies and simply re-run cmake (without deleting the build directory). In addition this is rather hard to debug for someone that just uses a project and is not overly familiar with CMake.

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Notes
(0034944) Brad King (manager) 2014-01-15 09:48	The caching is by design. The try_compile checks can be expensive and there are often a lot of them. It is common practice to use a fresh build tree each time or at least "rm -rf CMakeCache.txt CMakeFiles" to re-run checks.

(0036080) Robert Maynard (manager) 2014-06-02 08:38	Closing resolved issues that have not been updated in more than 4 months.

Issue History
Date Modified	Username	Field	Change
2014-01-15 05:17	Andreas Pakulat	New Issue
2014-01-15 09:48	Brad King	Note Added: 0034944
2014-01-15 09:48	Brad King	Status	new => resolved
2014-01-15 09:48	Brad King	Resolution	open => won't fix
2014-06-02 08:38	Robert Maynard	Note Added: 0036080
2014-06-02 08:38	Robert Maynard	Status	resolved => closed