The following issue has been SUBMITTED. ====================================================================== http://www.cmake.org/Bug/view.php?id=13889 ====================================================================== Reported By: Micha Hergarden Assigned To: ====================================================================== Project: CMake Issue ID: 13889 Category: CMake Reproducibility: always Severity: minor Priority: normal Status: new ====================================================================== Date Submitted: 2013-02-04 06:00 EST Last Modified: 2013-02-04 06:00 EST ====================================================================== Summary: Multiple add_custom_command for the same output file lead to multiple rules being generated for the same file Description: The cmake ninja generator adds multiple build rules for the same file, when there are multiple add_custom_command supplied in subdirectories. When ninja is run with the generated build.ninja file this leads to the following warning:
ninja: warning: multiple rules generate /tmp/test.c. build will not be correct; continuing anyway I am using the latest ninja from the git repository: https://github.com/martine/ninja.git commit 05736568b9a26599865dd7452e62f70ecdbc9e41 Steps to Reproduce: 1. Create a CMakeLists.txt file which adds two subdirectories, e.g.: cmake_minimum_required(VERSION 2.8) ADD_SUBDIRECTORY(tst1) ADD_SUBDIRECTORY(tst2) 2. Create two CMakeLists.txt files for the subdirectories, both of which add a custom command for the same output file, and an executable using that file, e.g.: ADD_CUSTOM_COMMAND(OUTPUT /tmp/test.c COMMAND cmake ARGS -E copy /home/test/test.c /tmp/test.c) ADD_EXECUTABLE(test1 /tmp/test.c) 3. Run cmake -G Ninja You can now examine the build.ninja file to see the multiple build rules 4. Run ninja You will now see the ninja warning. ====================================================================== Issue History Date Modified Username Field Change ====================================================================== 2013-02-04 06:00 Micha HergardenNew Issue ====================================================================== -- Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers
