add gcc flag --no-as-needed only if gnu and Linux

CMakeModules/morse/find/FindBLAS.cmake

@@ -307,7 +307,10 @@ if (BLA_VENDOR MATCHES "Intel*" OR BLA_VENDOR STREQUAL "All")
 
         set(BLAS_SEARCH_LIBS "")
 
-        set(additional_flags "-Wl,--no-as-needed")
+        set(additional_flags "")
+        if (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
+            set(additional_flags "-Wl,--no-as-needed")
+        endif()
 
         if(BLA_F95)
 

CMakeModules/morse/find/FindFFTW.cmake

@@ -373,7 +373,9 @@ if( NOT FFTW_FOUND )
         # MKL
         if(FFTW_LOOK_FOR_MKL)
             list(APPEND REQUIRED_LIBS "${CMAKE_THREAD_LIBS_INIT};-lm")
-            list(APPEND REQUIRED_LDFLAGS "-Wl,--no-as-needed")
+            if (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
+                list(APPEND REQUIRED_LDFLAGS "-Wl,--no-as-needed")
+            endif()
         endif()
 
         # set required libraries for link

CMakeModules/morse/find/FindLAPACK.cmake

@@ -366,7 +366,10 @@ if (BLA_VENDOR MATCHES "Intel" OR BLA_VENDOR STREQUAL "All")
 
     set(LAPACK_SEARCH_LIBS "")
 
-    set(additional_flags "-Wl,--no-as-needed")
+    set(additional_flags "")
+    if (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_SYSTEM_NAME STREQUAL "Linux")
+        set(additional_flags "-Wl,--no-as-needed")
+    endif()
 
     if (BLA_F95)
       set(LAPACK_mkl_SEARCH_SYMBOL "CHEEV")