try to link pthread on ubuntu20

Code/Source/svFSI/CMakeLists.txt

@@ -263,7 +263,8 @@ endif()
 # unit tests and Google Test
 if(ENABLE_UNIT_TEST)
  # Force Google Test to use pthreads (for ubuntu20)
- add_definitions(-DGTEST_HAS_PTHREAD=1)
+ # add_definitions(-DGTEST_HAS_PTHREAD=1)
+ add_compile_definitions(GTEST_HAS_PTHREAD=1)
 
  # Find pthreads package
  find_package(Threads REQUIRED)
@@ -283,10 +284,12 @@ if(ENABLE_UNIT_TEST)
  hello_test
  ../../../tests/unitTests/hello_test.cpp
  )
+ target_compile_definitions(hello_test PRIVATE GTEST_HAS_PTHREAD=1)
  target_link_libraries(
  hello_test
  GTest::gtest_main
  Threads::Threads # link threads library 
+ pthread
  )
  # gtest_discover_tests(hello_test)
  add_test(NAME GTestSample COMMAND hello_test)
@@ -317,11 +320,15 @@ if(ENABLE_UNIT_TEST)
  )
 
  # link Google Test
+ target_compile_definitions(runUnitTest PRIVATE GTEST_HAS_PTHREAD=1)
  target_link_libraries(
  runUnitTest
  GTest::gtest_main
  Threads::Threads # link threads library 
+ pthread
  )
+ target_compile_definitions(runUnitTest PRIVATE GTEST_HAS_PTHREAD=1)
+
  # gtest_discover_tests(runUnitTest)
  add_test(NAME UnitTest COMMAND runUnitTest)