[gdb/testsuite] Fix duplicates in gdb.fortran/huge.exp

With test-case gdb.fortran/huge.exp, on a system without fortran compiler, I
ran into a number of duplicates:
...
Running /home/vries/gdb/src/gdb/testsuite/gdb.fortran/huge.exp ...
gdb compile failed, default_target_compile: Can't find gfortran.
UNTESTED: gdb.fortran/huge.exp: huge.exp
  ...
gdb compile failed, default_target_compile: Can't find gfortran.
UNTESTED: gdb.fortran/huge.exp: huge.exp
DUPLICATE: gdb.fortran/huge.exp: huge.exp
UNSUPPORTED: gdb.fortran/huge.exp: require failed: expr $compilation_succeeded
...

Fix this by wrapping the compile in a with_test_prefix, getting us instead:
...
gdb compile failed, default_target_compile: Can't find gfortran.
UNTESTED: gdb.fortran/huge.exp: CRASH_GDB=2097152: huge.exp
  ...
gdb compile failed, default_target_compile: Can't find gfortran.
UNTESTED: gdb.fortran/huge.exp: CRASH_GDB=16: huge.exp
UNSUPPORTED: gdb.fortran/huge.exp: require failed: expr $compilation_succeeded
...

Tested on x86_64-linux.

1 files changed, 4 insertions, 2 deletions

diff --git a/gdb/testsuite/gdb.fortran/huge.exp b/gdb/testsuite/gdb.fortran/huge.exp
index 8d2158f..78c1d52 100644
--- a/gdb/testsuite/gdb.fortran/huge.exp
+++ b/gdb/testsuite/gdb.fortran/huge.exp
@@ -37,8 +37,10 @@ lappend opts f90
 set compilation_succeeded 0
 for { set size [expr $max] } { $size >= $min } { set size [expr $size / 2] } {
     set try_opts [concat $opts [list additional_flags=-DCRASH_GDB=$size]]
-    if { [build_executable $testfile.exp $testfile $srcfile $try_opts] == -1 } {
-	continue
+    with_test_prefix CRASH_GDB=$size {
+	if { [build_executable $testfile.exp $testfile $srcfile $try_opts] == -1 } {
+	    continue
+	}
     }
 
     set compilation_succeeded 1