MantisBT - CMake
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ID	Project	Category	View Status	Date Submitted	Last Update
0009851	CMake	CMake	public	2009-11-06 03:14	2010-11-05 12:13

Reporter	Marcel Loose
Assigned To	David Cole
Priority	normal	Severity	minor	Reproducibility	always
Status	closed	Resolution	fixed
Platform		OS		OS Version
Product Version	CMake-2-6
Target Version		Fixed in Version	CMake 2.8.3

Summary	0009851: string(RANDOM) does not produce random string within a CMake run
Description	I expected that string(RANDOM...) would produce a different string each time it is invoked. Turns out that this string is only different between different cmake runs. This is not what I expected. IMHO this is a bug, either in the code, or in the documentation. $ cat ../CMakeLists.txt project(Dummy NONE) cmake_minimum_required(VERSION 2.6) string(RANDOM a) string(RANDOM b) message(STATUS "a=${a}") message(STATUS "b=${b}") $ cmake .. -- a=PgDGb -- b=PgDGb -- Configuring done -- Generating done -- Build files have been written to: /tmp/loose/cmake/build
Steps To Reproduce
Additional Information	According to David Cole this is caused by the fact that the random generator is seeded on every call to string(RANDOM...) using a one-second resolution time value as seed. Solution: only seed the random generator once.
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Issue History
Date Modified	Username	Field	Change
2009-11-06 03:14	Marcel Loose	New Issue
2009-11-06 09:27	Bill Hoffman	Status	new => assigned
2009-11-06 09:27	Bill Hoffman	Assigned To	=> David Cole
2009-11-06 10:20	David Cole	Note Added: 0018362
2009-11-06 10:20	David Cole	Status	assigned => resolved
2009-11-06 10:20	David Cole	Resolution	open => fixed
2010-11-05 12:13	Marcel Loose	Note Added: 0022899
2010-11-05 12:13	Marcel Loose	Status	resolved => closed
2010-11-05 12:13	Marcel Loose	Fixed in Version	=> CMake 2.8.3

Notes