environment: add more info about Cray triggering __FAST_MATH__

cp2k · Feb 18, 2019 · cee18a0 · cee18a0
1 parent c671efb
commit cee18a0
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/environment.F b/src/environment.F
@@ -215,12 +215,14 @@ SUBROUTINE cp2k_init(para_env, output_unit, globenv, input_file_name, wdir)
 
 #if defined(__FAST_MATH__)
       CALL cp_warn(__LOCATION__, &
-                   "During compilation GCC's `-ffast-math` option was used."// &
+                   "During compilation one of the following flags was active:"// &
+                   "   `-ffast-math` (GCC)"// &
+                   "   `-hfpN` (Cray, N > 0, default N=2)"// &
                    " This can lead to wrong results and numerical instabilities"// &
                    " and is therefore no longer supported.")
 
 #if !defined(__FORCE_USE_FAST_MATH)
-#error -ffast-math can lead to wrong results and numerical instabilities and is therefore no longer supported
+#error -ffast-math (GCC) or -hfpN (N>0, Cray) can lead to wrong results and numerical instabilities and are therefore no longer supported
 #endif
 #endif
    END SUBROUTINE cp2k_init