SPEC2006: Allow building on FreeBSD

[arichardson]

Summary

For FreeBSD, we also have to pass -DSPEC_CPU_MACOSX to avoid the use of
gcvt() in 400.perlbench as this function is not available on FreeBSD.
This define is also required to successfully build 462.libquantum and
483.xalancbmk since SPEC_CPU_BSD is not handled in those benchmarks.

[Meinersbur]

External/SPEC/SpecCPU2006.cmake

32

That's indeed weird. Thanks for the comment.

[fhahn]

LGTM, thanks!

External/SPEC/SpecCPU2006.cmake

")
   endif()
 
   list(APPEND CPPFLAGS -DSPEC_CPU)
 
   if(TARGET_OS STREQUAL "Darwin")
     list(APPEND CPPFLAGS -DSPEC_CPU_MACOSX)
   elseif(TARGET_OS STREQUAL "Linux")
     list(APPEND CPPFLAGS -DSPEC_CPU_LINUX)
+  elseif(TARGET_OS STREQUAL "FreeBSD")
+    list(APPEND CPPFLAGS -DSPEC_CPU_BSD)
+    # As support for SPEC_CPU_BSD is incomplete in SPEC2006, we also have to
+    # pass -DSPEC_CPU_MACOSX to avoid the use of gcvt() in 400.perlbench as
+    # this function is not available on FreeBSD. Additionally, this define
+    # ensures that all required functions are compiled in 483.xalancbmk and
+    # that complex.h is included in 462.libquantum.
+    list(APPEND CPPFLAGS -DSPEC_CPU_MACOSX)
+  else()
+    message(WARNING "Unsupported SPEC2006 TARGET_OS: ${TARGET_OS}")
   endif()
 
   if(ARCH STREQUAL "x86")
     if(CMAKE_SIZEOF_VOID_P EQUAL 8)
       list(APPEND CPPFLAGS -DSPEC_CPU_X64)
     else()
       list(APPEND CPPFLAGS -DSPEC_CPU_IA32)
     endif()