The following issue has been SUBMITTED.
======================================================================
http://public.kitware.com/Bug/view.php?id=14721
======================================================================
Reported By: Andreas Mohr
Assigned To:
======================================================================
Project: CMake
Issue ID: 14721
Category: CMake
Reproducibility: always
Severity: minor
Priority: normal
Status: new
======================================================================
Date Submitted: 2014-01-27 11:00 EST
Last Modified: 2014-01-27 11:00 EST
======================================================================
Summary: Ninja: warning message related to
WriteUnknownExplicitDependencies() for CMakeCache.txt: file entry simply not
supported yet??
Description:
See minimal test case below.
amoh@lxamoh9010:~/cmake_tests/ninja_cmakecache_txt/build$ ninja
ninja: warning: multiple rules generate CMakeCache.txt. builds involving this
target will not be correct; continuing anyway
ninja: no work to do.
Ninja 1.4.0, using CMake trunk.
Steps to Reproduce:
cmake_minimum_required(VERSION 2.8)
project(ninja_cmakecache_txt C)
# ...and add a default target to create a backup of CMakeCache.txt,
# since that file might get destroyed too easily (at least CMake 2.6.4
# will kill it on out-of-disk-space, resulting in complete abort of
# configuration run):
if(NOT TARGET master_backup_CMakeCache)
# CMAKE_CACHEFILE_DIR defined when cache already existing only...
if(DEFINED CMAKE_CACHEFILE_DIR)
# Better reference specific CMAKE_CACHEFILE_DIR variable (same as
CMAKE_BINARY_DIR).
# Unfortunately there's no CMake file name variable for "CMakeCache.txt"
# (source code of CMake always open-codes that name),
# thus there's nothing to reference here.
set(CMakeCache_file "${CMAKE_CACHEFILE_DIR}/CMakeCache.txt")
set(CMakeCache_file_backup "${CMakeCache_file}.backup")
add_custom_command(OUTPUT "${CMakeCache_file_backup}"
# copy_if_different _not_ needed (target dependency needs remaking? -->
_do_ copy!)
COMMAND "${CMAKE_COMMAND}" -E copy "${CMakeCache_file}"
"${CMakeCache_file_backup}"
DEPENDS "${CMakeCache_file}"
COMMENT "creating CMakeCache backup (${CMakeCache_file_backup})"
)
add_custom_target(master_backup_CMakeCache ALL DEPENDS
"${CMakeCache_file_backup}")
endif(DEFINED CMAKE_CACHEFILE_DIR)
endif(NOT TARGET master_backup_CMakeCache)
file(WRITE test1.c "int main() { return 1; }")
add_library(test1 SHARED test1.c)
Additional Information:
WriteUnknownExplicitDependencies() seems to be the function responsible for
creating/filtering out these parts.
Manually removing the part
# =============================================================================
# Unknown Build Time Dependencies.
# Tell Ninja that they may appear as side effects of build rules
# otherwise ordered by order-only dependencies.
build CMakeCache.txt: phony CMakeCache.txt
from build.ninja makes the warning message go away, in fact.
So tell me that WriteUnknownExplicitDependencies() handling simply failed to
have CMakeCache.txt listed as a build-environment-related file?
Or perhaps my sample is completely invalid since there might be a problem?
(read: "I don't know what I'm doing here" :)
Thanks,
Andreas Mohr
======================================================================
Issue History
Date Modified Username Field Change
======================================================================
2014-01-27 11:00 Andreas Mohr New 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
