[PATCH 2/4] ld/testsuite: don't output to /dev/null on mingw hosts

["Clément Chigot" <chigot@adacore.com>]

Mingw doesn't have /dev/null and thus "-o /dev/null" will fail.
Currently, all the options are checked using this "-o /dev/null",
resulting in them being disabled on mingw hosts. Fix that by
outputting to a real .exe file.

ld/ChangeLog:

	* testsuite/config/default.exp: Replace "-o /dev/null" by a file
	on mingw hosts.
---
 ld/testsuite/config/default.exp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/ld/testsuite/config/default.exp b/ld/testsuite/config/default.exp
index 257fd4ba985..776b33842c2 100644
--- a/ld/testsuite/config/default.exp
+++ b/ld/testsuite/config/default.exp
@@ -383,6 +383,9 @@ proc compiler_supports { flag args } {
 	    append flags " [board_info [target_info name] ldflags]"
 	}
 	set fn "cs[pid].c"
+	if [ishost "*-*-mingw*"] {
+	    set fno "cs[pid].exe"
+	}
 	set f [open $fn "w"]
 	if { [llength $args] > 0 } {
 	    puts $f [lindex $args 0]
@@ -391,7 +394,12 @@ proc compiler_supports { flag args } {
 	}
 	close $f
 	set rfn [remote_download host $fn]
-	set avail [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $flag $rfn -o /dev/null"]
+	if [ishost "*-*-mingw*"] {
+	    set avail [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $flag $rfn -o $fno"]
+	    file delete $fno
+	} else {
+	    set avail [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $flag $rfn -o /dev/null"]
+	}
 	remote_file host delete $rfn
 	file delete $fn
 	return $avail
-- 
2.25.1