[Bug c++/57548] calling gnu multiversioned function at file scope causes ICE

[tmsriram at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57548

--- Comment #1 from Sriraman Tallam <tmsriram at google dot com> ---
Patch proposed to fix this problem:

The problem here is that the caller to fum not from a function and 
current_function_decl is NULL when processing the
call.  The simple fix in call.c to check current_function_decl before
calling can_inline_p target hook.

    * cp/call.c (build_over_call):  Check if current_function_decl is
    NULL.
    * testsuite/g++.dg/ext/pr57548.C: New test.


Index: cp/call.c
===================================================================
--- cp/call.c    (revision 199662)
+++ cp/call.c    (working copy)
@@ -7053,7 +7053,8 @@ build_over_call (struct z_candidate *cand, int fla
      otherwise the call should go through the dispatcher.  */

   if (DECL_FUNCTION_VERSIONED (fn)
-      && !targetm.target_option.can_inline_p (current_function_decl, fn))
+      && (current_function_decl == NULL
+      || !targetm.target_option.can_inline_p (current_function_decl, fn)))
     {
       fn = get_function_version_dispatcher (fn);
       if (fn == NULL)
Index: testsuite/g++.dg/ext/pr57548.C
===================================================================
--- testsuite/g++.dg/ext/pr57548.C    (revision 0)
+++ testsuite/g++.dg/ext/pr57548.C    (revision 0)
@@ -0,0 +1,25 @@
+/* { dg-do compile { target i?86-*-* x86_64-*-* } } */
+/* { dg-require-ifunc "" }  */
+
+int fum (); // Extra declaration that is merged with the second one.
+int fum () __attribute__ ((target("default")));
+
+
+int fum () __attribute__((target( "mmx")));
+int fum () __attribute__((target( "popcnt")));
+int fum () __attribute__((target( "sse")));
+int fum () __attribute__((target( "sse2")));
+int fum () __attribute__((target( "sse3")));
+int fum () __attribute__((target( "ssse3")));
+int fum () __attribute__((target( "sse4.1")));
+int fum () __attribute__((target( "sse4.2")));
+int fum () __attribute__((target( "avx")));
+int fum () __attribute__((target( "avx2")));
+
+int fum () __attribute__((target("arch=core2")));
+int fum () __attribute__((target("arch=corei7")));
+int fum () __attribute__((target("arch=atom")));
+
+int (*p)() = &fum;
+
+int j = fum();