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If given build tree as Eigen3 root, find source

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Eigen3 is a template-library, so we must compile the source code
directly together with ours instead of linking to a library.

If the build script gives us the location of a "built" Eigen3,
meaning a directory in which CMake has been run, locate the true
source directory from the cache entries.
This commit is contained in:
Roland Kaufmann 2013-09-02 09:47:53 +02:00
parent ae7dcf690a
commit 3c678f06e4
1 changed files with 28 additions and 1 deletions
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29
cmake/Modules/FindEigen3.cmake
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@ -65,9 +65,36 @@ if (NOT EIGEN3_INCLUDE_DIR)
# other version to be swapped in to substitute; if not specified, then
# go search usual locations
if (EIGEN3_ROOT)
# if we are given the path to a "build" tree (meaning somewhere Eigen3
# has been configured), then use the eigen3.pc file to figure out the
# name of the *real* root directory
if (EXISTS "${EIGEN3_ROOT}/CMakeCache.txt")
# get the cache entry that tells use the source tree location
set (_regex "Eigen_SOURCE_DIR:STATIC=\(.*\)")
file (STRINGS
"${EIGEN3_ROOT}/CMakeCache.txt"
EIGEN3_SOURCE_TREE
REGEX "${_regex}"
)
# trim away the key definition, be left with the value
if (EIGEN3_SOURCE_TREE)
string (REGEX REPLACE
"${_regex}"
"\\1"
EIGEN3_SOURCE_TREE
"${EIGEN3_SOURCE_TREE}"
)
# if something doesn't look as expected, abort and search in _ROOT
else ()
set (EIGEN3_SOURCE_TREE "${EIGEN3_ROOT}")
endif ()
else ()
set (EIGEN3_SOURCE_TREE "${EIGEN3_ROOT}")
endif ()
find_path (EIGEN3_INCLUDE_DIR
NAMES signature_of_eigen3_matrix_library
PATHS ${EIGEN3_ROOT}
PATHS ${EIGEN3_SOURCE_TREE}
PATH_SUFFIXES eigen3 include/eigen3 eigen include/eigen
NO_DEFAULT_PATH
)