[PATCH] Add "needs_status_wrapper" feature to gdb testsuite.

[Michael Snyder <msnyder@cygnus.com>]

This is a feature that has been being used in the GCC testsuite, 
but I was completely unaware of it before now.

This enables tests that look for an exit status to succeed even
on targets that don't implement the exit status.  I think it's
pretty cool!

I've modified two tests from gdb/testsuite to take advantage of it.
I'm not sure which other tests may also need modification, but
now there are a couple of examples to look at.

Index: lib/gdb.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/lib/gdb.exp,v
retrieving revision 1.15
diff -p -r1.15 gdb.exp
*** lib/gdb.exp	3 Apr 2002 16:17:11 -0000	1.15
--- lib/gdb.exp	7 May 2002 00:10:06 -0000
*************** proc gdb_preprocess {source dest args} {
*** 1092,1099 ****
--- 1092,1125 ----
      return $result;
  }
  
+ set gdb_wrapper_initialized 0
+ 
+ proc gdb_wrapper_init { args } {
+     global gdb_wrapper_initialized;
+     global gdb_wrapper_file;
+     global gdb_wrapper_flags;
+ 
+     if { $gdb_wrapper_initialized == 1 } { return; }
+ 
+     if {[target_info exists needs_status_wrapper] && \
+ 	    [target_info needs_status_wrapper] != "0" && \
+ 	    ![info exists gdb_wrapper_file]} {
+ 	set result [build_wrapper "testglue.o"];
+ 	if { $result != "" } {
+ 	    set gdb_wrapper_file [lindex $result 0];
+ 	    set gdb_wrapper_flags [lindex $result 1];
+ 	} else {
+ 	    warning "Status wrapper failed to build."
+ 	}
+     }
+     set gdb_wrapper_initialized 1
+ }
+ 
  proc gdb_compile {source dest type options} {
      global GDB_TESTCASE_OPTIONS;
+     global gdb_wrapper_file;
+     global gdb_wrapper_flags;
+     global gdb_wrapper_initialized;
  
      if [target_info exists gdb_stub] {
  	set options2 { "additional_flags=-Dusestubs" }
*************** proc gdb_compile {source dest type optio
*** 1110,1115 ****
--- 1136,1150 ----
      }
      verbose "options are $options"
      verbose "source is $source $dest $type $options"
+ 
+     if { $gdb_wrapper_initialized == 0 } { gdb_wrapper_init }
+ 
+     if {[target_info exists needs_status_wrapper] && \
+ 	    [target_info needs_status_wrapper] != "0" && \
+ 	    [info exists gdb_wrapper_file]} {
+ 	lappend options "libs=${gdb_wrapper_file}"
+ 	lappend options "ldflags=${gdb_wrapper_flags}"
+     }
  
      set result [target_compile $source $dest $type $options];
      regsub "\[\r\n\]*$" "$result" "" result;
Index: gdb.base/a2-run.exp
2002-05-06  Michael Snyder  <msnyder@redhat.com>

	Enable the "needs_status_wrapper" testsuite feature.
	* lib/gdb.exp (gdb_wrapper_init): New procedure.
	(gdb_compile): Conditionally call gdb_wrapper_init.
	* gdb.base/a2-run.exp: Recognize output from status wrapper.
	* gdb.c++/method.exp: Recognize output from status wrapper.

===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.base/a2-run.exp,v
retrieving revision 1.4
diff -p -r1.4 a2-run.exp
*** gdb.base/a2-run.exp	14 Feb 2002 06:25:18 -0000	1.4
--- gdb.base/a2-run.exp	7 May 2002 00:10:06 -0000
*************** if [istarget "*-*-vxworks*"] then {
*** 80,85 ****
--- 80,88 ----
  	-re ".*usage:  factorial <number>.*Program exited with code 01.*$gdb_prompt $" {
  	    pass "run \"$testfile\" with no args"
  	}
+ 	-re ".*usage:  factorial <number>.* EXIT code 1.*Program exited normally.*$gdb_prompt $" {
+ 	    pass "run \"$testfile\" with no args (exit wrapper)"
+ 	}
  	-re ".*$gdb_prompt $" {
  	    fail "run \"$testfile\" with no args"
  	    verbose "expect_out is $expect_out(buffer)" 2
Index: gdb.c++/method.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.c++/method.exp,v
retrieving revision 1.7
diff -p -r1.7 method.exp
*** gdb.c++/method.exp	8 Apr 2002 22:41:46 -0000	1.7
--- gdb.c++/method.exp	7 May 2002 00:10:06 -0000
*************** gdb_expect {
*** 180,185 ****
     timeout { fail "(timeout) ptype A" }
  }
  
! gdb_test "cont" \
!   "Continuing.\r\n\r\nProgram exited normally." \
!   "finish program"
--- 180,194 ----
     timeout { fail "(timeout) ptype A" }
  }
  
! send_gdb "cont\n"
! gdb_expect {
!     -re "Continuing\r\n\r\nProgram exited normally.*$gdb_prompt $" {
! 	pass "finish program"
!     }
!     -re "Continuing.* EXIT code 0.*Program exited normally.*$gdb_prompt $" {
! 	pass "finish program (exit wrapper)" 
!     }
!     -re ".*$gdb_prompt $" { fail "finish program" }
!     default:{               fail "finish program (timeout)" }
! }
!