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0014059

CMake

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public

2013-04-03 11:09

2013-10-07 10:04

Reporter

ashuang

Assigned To

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

not fixable

Platform

Ubuntu

OS Version

10.04 i386

Product Version

CMake 2.8.9

Target Version

Fixed in Version

Summary

0014059: CMake double executes a custom command when multiple custom target depend on it

Description

CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)

add_custom_command(OUTPUT a.txt
COMMAND touch a.txt
COMMENT "Making a")

add_custom_target(b ALL COMMENT "Making b" DEPENDS a.txt)
add_custom_target(c ALL COMMENT "Making c" DEPENDS a.txt)
add_custom_target(d ALL COMMENT "Making d" DEPENDS a.txt)

Steps To Reproduce

Run:
$ cmake .
$ make -j 3
[ 16%] [ 33%] [ 50%] Making a
Making a
Making a
[ 66%] [ 83%] [100%] Making b
Making d
Making c
[100%] [100%] Built target b
Built target d
[100%] Built target c

Additional Information

I would expect to see only one instance of "Making a".

When I use this pattern with a more complex add_custom_command(), the output file gets corrupted because multiple processes are writing to the file at the same time.

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Notes
(0032749) Brad King (manager) 2013-04-03 11:25	http://www.cmake.org/Wiki/CMake_FAQ#How_can_I_generate_a_file_used_in_more_than_one_target_in_the_same_directory.3F [^]

(0034024) Robert Maynard (manager) 2013-10-07 10:04	Closing resolved issues that have not been updated in more than 4 months.

Issue History
Date Modified	Username	Field	Change
2013-04-03 11:09	ashuang	New Issue
2013-04-03 11:25	Brad King	Note Added: 0032749
2013-04-03 11:25	Brad King	Status	new => resolved
2013-04-03 11:25	Brad King	Resolution	open => not fixable
2013-10-07 10:04	Robert Maynard	Note Added: 0034024
2013-10-07 10:04	Robert Maynard	Status	resolved => closed