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build system: prevent endless loop when using dunecontrol

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this seems to be a bug in cmake 2.8.10.2: if the user sets the
CMAKE_CXX_COMPILER variable for a build directory where this variable
has already been set, one gets an endless loop. This stings especially
if using the dunecontrol compatibility layer as the compiler flags are
unconditionally set via the CXX_FLAGS environment variable in the
options file. Running duncontrol on a module twice will thus trigger the
infinite loop if some compiler flags are set by the user.

The solution is relatively simple: Delete the CMakeFiles directory
before calling cmake. for the dunecontrol compatibility mode, we do
this in the configure script. For details about the cmake bug, see
http://www.cmake.org/Bug/view.php?id=14119
This commit is contained in:
Andreas Lauser 2013-11-11 16:57:26 +01:00 committed by Bård Skaflestad
parent 2405462a38
commit 2e9272384d
1 changed files with 7 additions and 0 deletions
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7
cmake/Scripts/configure vendored
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@ -510,6 +510,13 @@ done
# only wrap in env command if any variable were actually passed
[ -n "${ENVVARS}" ] && ENVVARS="env ${ENVVARS} "
# delete the previous 'CMakeFiles' directory. this prevents an endless
# loop if variables that require a full regeneration of the cache are
# set (most notably 'CXX' and 'CXX_FLAGS').
# For more details, see http://www.cmake.org/Bug/view.php?id=14119
echo "--- deleting previous CMake files ---"
rm -rf CMakeFiles
# pass everything on to CMake
CMDLINE="${ENVVARS}${CMAKE_COMMAND} \"${srcdir}\" ${use_ninja}\"-DCMAKE_INSTALL_PREFIX=$prefix\"${buildtype}${pch_use}${silent_rules}${debug_loc}${use_openmp}${use_mpi}${use_lto}${use_runpath}${use_tests}${use_samples}${use_underscoring}${c_compiler}${c_opts}${cxx_compiler}${cxx_opts}${fort_compiler}${fort_opts}${boost_opts}${buildname}${site} ${FEATURES}"
echo --- calling CMake ---