try to find external qpOASES before falling back on embedded version

CMakeLists.txt

@@ -139,25 +139,31 @@ endif()
 set(DOC_FILES README.md)
 file(GLOB_RECURSE EXAMPLE_FILES examples "*.pyscn" "*.py" "*.md" "*.psl" "*.pslx" "*.scn" "*.xml")
 
-set(OASES_LIBRARY_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/extlibs/qpOASES-3.2.0/")
-add_subdirectory(${OASES_LIBRARY_DIRECTORY} extlibs/libqpOASES)
-find_package(libqpOASES REQUIRED)
-message("libqpOASES_INCLUDE_DIRS = ${libqpOASES_INCLUDE_DIRS}")
-include_directories(${libqpOASES_INCLUDE_DIRS})
-sofa_install_libraries(PATHS ${libqpOASES_LIBRARY})
-
 option(SOFTROBOTSINVERSE_INSTALL_HEADERS "Install the headers" ON)
 if(SOFTROBOTSINVERSE_INSTALL_HEADERS)
     add_library(${PROJECT_NAME} SHARED ${SOURCE_FILES} ${DOC_FILES} ${EXAMPLE_FILES} ${HEADER_FILES})
 else()
     add_library(${PROJECT_NAME} SHARED ${SOURCE_FILES} ${DOC_FILES} ${EXAMPLE_FILES} "${SRC_DIR}/component/config.h.in")
 endif()
 
+find_package(qpOASES)
+if(qpOASES_FOUND)
+  include_directories(${qpOASES_INCLUDE_DIRS})
+  target_link_libraries(${PROJECT_NAME} ${qpOASES_LIBRARIES})
+else()
+  message("External package qpOASES not found, using embedded version...")
+  set(OASES_LIBRARY_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/extlibs/qpOASES-3.2.0/")
+  add_subdirectory(${OASES_LIBRARY_DIRECTORY} extlibs/libqpOASES)
+  find_package(libqpOASES REQUIRED)
+  include_directories(${libqpOASES_INCLUDE_DIRS})
+  sofa_install_libraries(PATHS ${libqpOASES_LIBRARY})
+  target_link_libraries(${PROJECT_NAME} ${libqpOASES_LIBRARY})
+endif()
+
 target_link_libraries(${PROJECT_NAME}
     SoftRobots
     Sofa.Component.Constraint.Lagrangian.Solver
     Sofa.Component.Collision.Response.Contact)
-target_link_libraries(${PROJECT_NAME} ${libqpOASES_LIBRARY})
 
 # TODO: remove this when SoftRobotsConfig.cmake.in is fixed
 message("SOFTROBOTS_HAVE_SOFA_GL = ${SOFTROBOTS_HAVE_SOFA_GL}")

cmake/Modules/FindqpOASES.cmake

@@ -0,0 +1,23 @@
+# Find the qpOASES includes and libraries.
+# The following variables are set if qpOASES is found.  If qpOASES is not
+# found, qpOASES_FOUND is set to false.
+#  qpOASES_FOUND        - True when the qpOASES include directory is found.
+#  qpOASES_INCLUDE_DIRS - the path to where the qpOASES include files are.
+#  qpOASES_LIBRARIES    - The libraries to link against qpOASES
+
+include(FindPackageHandleStandardArgs)
+
+find_path(qpOASES_INCLUDE_DIR
+  NAMES qpOASES.hpp
+  PATH_SUFFIXES include
+)
+
+find_library(qpOASES_LIBRARY
+  NAMES qpOASES
+  PATH_SUFFIXES lib
+)
+
+set(qpOASES_INCLUDE_DIRS ${qpOASES_INCLUDE_DIR})
+set(qpOASES_LIBRARIES ${qpOASES_LIBRARY})
+
+find_package_handle_standard_args(qpOASES DEFAULT_MSG qpOASES_LIBRARIES qpOASES_INCLUDE_DIRS)