add platform check for how to link to the standard math library.

This allows to support QNX.

1 files changed, 14 insertions, 11 deletions

diff --git a/unsupported/doc/examples/CMakeLists.txt b/unsupported/doc/examples/CMakeLists.txt
index cb42b2ab9..61af3e5a5 100644
--- a/unsupported/doc/examples/CMakeLists.txt
+++ b/unsupported/doc/examples/CMakeLists.txt
@@ -3,15 +3,18 @@ FILE(GLOB examples_SRCS "*.cpp")
 ADD_CUSTOM_TARGET(unsupported_examples)
 
 FOREACH(example_src ${examples_SRCS})
-GET_FILENAME_COMPONENT(example ${example_src} NAME_WE)
-ADD_EXECUTABLE(example_${example} ${example_src})
-GET_TARGET_PROPERTY(example_executable
-                    example_${example} LOCATION)
-ADD_CUSTOM_COMMAND(
-  TARGET example_${example}
-  POST_BUILD
-  COMMAND ${example_executable}
-  ARGS >${CMAKE_CURRENT_BINARY_DIR}/${example}.out
-)
-ADD_DEPENDENCIES(unsupported_examples example_${example})
+  GET_FILENAME_COMPONENT(example ${example_src} NAME_WE)
+  ADD_EXECUTABLE(example_${example} ${example_src})
+  if(EIGEN_STANDARD_LIBRARIES_TO_LINK_TO)
+    target_link_libraries(example_${example} ${EIGEN_STANDARD_LIBRARIES_TO_LINK_TO})
+  endif()
+  GET_TARGET_PROPERTY(example_executable
+                      example_${example} LOCATION)
+  ADD_CUSTOM_COMMAND(
+    TARGET example_${example}
+    POST_BUILD
+    COMMAND ${example_executable}
+    ARGS >${CMAKE_CURRENT_BINARY_DIR}/${example}.out
+  )
+  ADD_DEPENDENCIES(unsupported_examples example_${example})
 ENDFOREACH(example_src)