0 Replies Latest reply on Jul 12, 2013 6:45 AM by mmoelle1

    Compilation without Target processor check

    mmoelle1

      Dear all,

       

      I am trying to specify optimization flags (-m....) which are either not supported by the CPU where compilation is performed (cross-compilation) or the CPU is newer than the internal auto-detection mechanism is able to handle.

       

      Here, are two examples to illustrate my scenarios

       

      Compilation platform: Intel(R) Xeon(R) CPU E7340  @ 2.40GHz

       

      flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall lm constant_tsc arch_perfmon pebs bts rep_good nopl pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca lahf_lm

      from /proc/cpuinfo

       

      1) Trying to explicitly enable a feature supported by the CPU, but CPU is not detected correctly

      openf90 -mssse3 hello.f90

      openf90 ERROR: Target processor does not support SSSE3.

       

      2) Trying to explicitly enable a feature not supported by the CPU, but CPU where the code should be run does support it

      openf90 -msse4.2 hello.f90

      openf90 ERROR: Target processor does not support SSE42.

       

      Is there a mechanism to disable this internal check for features supported by the CPU?

       

      Thanking you very much in advance

       

      Matthias