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/usr/src/gcc-8/debian/patches/alpha-no-ev4-directive.diff is in gcc-8-source 8-20180414-1ubuntu2.

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# DP: never emit .ev4 directive.

---
 gcc/config/alpha/alpha.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

Index: b/src/gcc/config/alpha/alpha.c
===================================================================
--- a/src/gcc/config/alpha/alpha.c
+++ b/src/gcc/config/alpha/alpha.c
@@ -9504,7 +9504,7 @@ alpha_file_start (void)
     fputs ("\t.set nomacro\n", asm_out_file);
   if (TARGET_SUPPORT_ARCH | TARGET_BWX | TARGET_MAX | TARGET_FIX | TARGET_CIX)
     {
-      const char *arch;
+      const char *arch = NULL;
 
       if (alpha_cpu == PROCESSOR_EV6 || TARGET_FIX || TARGET_CIX)
 	arch = "ev6";
@@ -9514,10 +9514,9 @@ alpha_file_start (void)
 	arch = "ev56";
       else if (alpha_cpu == PROCESSOR_EV5)
 	arch = "ev5";
-      else
-	arch = "ev4";
 
-      fprintf (asm_out_file, "\t.arch %s\n", arch);
+      if (arch)
+        fprintf (asm_out_file, "\t.arch %s\n", arch);
     }
 }