move bigendian setting to sp tests only

CMakeLists.txt

@@ -51,7 +51,7 @@ endif()
 
 # Set compiler flags.
 if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
-  set(CMAKE_Fortran_FLAGS "-g -traceback -convert big_endian -assume byterecl -fp-model strict -fpp -auto ${CMAKE_Fortran_FLAGS}")
+  set(CMAKE_Fortran_FLAGS "-g -traceback -assume byterecl -fp-model strict -fpp -auto ${CMAKE_Fortran_FLAGS}")
   set(CMAKE_Fortran_FLAGS_DEBUG "-O0 -check all -warn all")
   if(CMAKE_Fortran_COMPILER_ID MATCHES "^(IntelLLVM)$")
     # Avoid Intel OneAPI 2023.2.1 bug
@@ -60,7 +60,7 @@ if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
   set(fortran_d_flags "-r8")
   set(fortran_8_flags "-i8 -r8")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
-  set(CMAKE_Fortran_FLAGS "-g -fbacktrace -cpp -fconvert=big-endian ${CMAKE_Fortran_FLAGS}")
+  set(CMAKE_Fortran_FLAGS "-g -fbacktrace -cpp ${CMAKE_Fortran_FLAGS}")
   set(CMAKE_Fortran_FLAGS_DEBUG "-O0 -ggdb -Wall -Wno-unused-dummy-argument -Wsurprising -Wextra -fcheck=all")
   set(fortran_d_flags "-fdefault-real-8")
   set(fortran_8_flags "-fdefault-integer-8 -fdefault-real-8")

tests/CMakeLists.txt

@@ -10,7 +10,11 @@ function(create_sp_test name kind timeout)
     target_link_libraries(${name}_${kind} PRIVATE OpenMP::OpenMP_Fortran)
   endif()
   target_link_libraries(${name}_${kind} PRIVATE ip::ip_${kind})
-  set_target_properties(${name}_${kind} PROPERTIES COMPILE_FLAGS "${fortran_${kind}_flags}")
+  if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|IntelLLVM)$")
+    set_target_properties(${name}_${kind} PROPERTIES COMPILE_FLAGS "-convert big_endian ${fortran_${kind}_flags}")
+  elif(${CMAKE_Fortran_COMPILER_ID} MATCHES "^(GNU)$")
+    set_target_properties(${name}_${kind} PROPERTIES COMPILE_FLAGS "-fconvert=big-endian ${fortran_${kind}_flags}")
+  endif()
   add_test(NAME ${name}_${kind} COMMAND ${name}_${kind})
   target_compile_definitions(${name}_${kind} PRIVATE KIND_${kind})
   if(TEST_TIME_LIMIT)