[patch] Make multi-sim.exp work with GCC test_installed script.

[Steve Ellcey]

This is a proposed change to the multi-sim.exp baseboard to make it more
useful when testing installed cross compilers.  I wanted to use the
contrib/test_installed script that comes with GCC to test an installed
cross compiler using a simulator but ran into two problems.  The first
was that test_installed did not allow me to set a target different then
the host I was running on.  I have submittted a patch to GCC to allow
me to do this (http://gcc.gnu.org/ml/gcc-patches/2014-03/msg00301.html).
The other issue is that when multi-sim was running the compiler to
find the dynamic linker and rpaths it was running the system GCC instead
of the GCC I wanted to test.  My fix for that was to check the GCC_UNDER_TEST
in this baseboard.  I am not sure if this is the right way to do this,
no other baseboard in dejagnu checks for GCC_UNDER_TEST but if there is
a way to set things up in the test_installed script so I don't have to
use GCC_UNDER_TEST I was not able to find it.

So is an acceptable patch or is there a better way to find the compiler
I want to use?

Steve Ellcey
address@hidden


2014-04-14  Steve Ellcey  <address@hidden>

        * baseboards/multi-sim.exp (dynamic_linker_flag): Check GCC_UNDER_TEST.
        * baseboards/multi-sim.exp (rpath_flags): Ditto.


diff --git a/baseboards/multi-sim.exp b/baseboards/multi-sim.exp
index f725c6c..ef1f2f9 100644
--- a/baseboards/multi-sim.exp
+++ b/baseboards/multi-sim.exp
@@ -42,7 +42,12 @@ load_base_board_description "basic-sim"
 
 proc dynamic_linker_flag { args } {
   global board
-  set compiler "[board_info $board compiler]"
+  global GCC_UNDER_TEST
+  if [info exists GCC_UNDER_TEST] then {
+    set compiler $GCC_UNDER_TEST
+  } else {
+    set compiler "[board_info $board compiler]"
+  }
   set mflags "[board_info $board multilib_flags]"
   set result [remote_exec host "$compiler $mflags --print-sysroot"]
   set output [lindex $result 1]
@@ -54,7 +59,12 @@ proc dynamic_linker_flag { args } {
 }
 proc rpath_flags { args } {
   global board
-  set compiler "[board_info $board compiler]"
+  global GCC_UNDER_TEST
+  if [info exists GCC_UNDER_TEST] then {
+    set compiler $GCC_UNDER_TEST
+  } else {
+    set compiler "[board_info $board compiler]"
+  }
   set mflags "[board_info $board multilib_flags] [libgloss_include_flags] 
[newlib_include_flags] [libgloss_link_flags] [libgloss_link_flags]"
   set rpathflags ""
   set gccpath [get_multilibs]