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Test strings on length before content

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A substring can of course not be longer that the full string. Also fixes
problems with CMake-versions that doesn't handle out-of-range parameters
to the SUBSTRING sub-command.
This commit is contained in:
Roland Kaufmann 2013-03-13 11:20:28 +01:00
parent ae4b033ee7
commit 44a638dce3
1 changed files with 13 additions and 3 deletions
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16
cmake/Modules/DuneCompat.cmake
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@ -29,9 +29,19 @@ endif (CMAKE_GENERATOR MATCHES "Unix Makefiles")
# source dir and most likely doesn't contain other projects) anyway,
# i.e. we only copy if we are truly out-of-source
string (LENGTH "${PROJECT_SOURCE_DIR}/" _src_dir_len)
string (SUBSTRING "${PROJECT_BINARY_DIR}/" 0 ${_src_dir_len} _proj_prefix)
if (NOT "${PROJECT_SOURCE_DIR}/" STREQUAL "${_proj_prefix}")
string (LENGTH "${PROJECT_BINARY_DIR}/" _bin_dir_len)
if (_src_dir_len GREATER _bin_dir_len)
set (_not_substring TRUE)
else (_src_dir_len GREATER _bin_dir_len)
string (SUBSTRING "${PROJECT_BINARY_DIR}/" 0 ${_src_dir_len} _proj_prefix)
if ("${PROJECT_SOURCE_DIR}/" STREQUAL "${_proj_prefix}")
set (_not_substring FALSE)
else ("${PROJECT_SOURCE_DIR}/" STREQUAL "${_proj_prefix}")
set (_not_substring TRUE)
endif ("${PROJECT_SOURCE_DIR}/" STREQUAL "${_proj_prefix}")
endif (_src_dir_len GREATER _bin_dir_len)
if (_not_substring)
execute_process (COMMAND
${CMAKE_COMMAND} -E copy_if_different ${PROJECT_SOURCE_DIR}/dune.module ${PROJECT_BINARY_DIR}/dune.module
)
endif (NOT "${PROJECT_SOURCE_DIR}/" STREQUAL "${_proj_prefix}")
endif (_not_substring)