Compile break-asm-file{0,1}.s without debug info

If I add some nop into break-asm-file1.s like this,

--- INDEX:/gdb/testsuite/gdb.linespec/break-asm-file1.s
+++ WORKDIR:/gdb/testsuite/gdb.linespec/break-asm-file1.s
@@ -31,8 +31,8 @@ _func:
 	.type func, %function
 func:
 .Lbegin_func:
-	.int 0
-	.int 0
+	nop
+	nop
 .Lend_func:
 	.size func, .-func
 .Lend_text1:

I get the following error:

Running gdb/testsuite/gdb.linespec/break-asm-file.exp ...
gdb/testsuite/gdb.linespec/break-asm-file1.s: Assembler messages:^M
gdb/testsuite/gdb.linespec/break-asm-file1.s: Fatal error: duplicate .debug_line sections

break-asm-file0.s and break-asm-file1.s have already had debug information
(written manually), so don't need to generate debug infor for them.

gdb/testsuite:

2015-03-26  Yao Qi  <yao.qi@linaro.org>

	* gdb.linespec/break-asm-file.exp: Don't call prepare_for_testing.
	Call gdb_compile instead to compile each .s files without debug
	information.

gdb/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2015-03-26  Yao Qi  <yao.qi@linaro.org>
+
+	* gdb.linespec/break-asm-file.exp: Don't call prepare_for_testing.
+	Call gdb_compile instead to compile each .s files without debug
+	information.
+
 2015-03-26  Yao Qi  <yao.qi@linaro.org>
 
 	* gdb.base/savedregs.exp (process_saved_regs): Make

gdb/testsuite/gdb.linespec/break-asm-file.exp

@@ -28,11 +28,24 @@ if {![dwarf2_support]} {
     return 0
 }
 
-if {[prepare_for_testing ${testfile}.exp $execfile \
-	 [list $srcfile $asm_file1 $asm_file0] \
-	 {debug nowarnings optimize=-O0}]} {
-    untested "Skipping ${testfile}."
-    return
+if  {[gdb_compile ${srcdir}/${subdir}/${srcfile} ${binfile}1.o \
+	  object {debug nowarnings optimize=-O0}] != ""} {
+    return -1
+}
+
+# Compile .s files without debug information.
+if  {[gdb_compile ${srcdir}/${subdir}/$asm_file0 ${binfile}2.o \
+	  object {nodebug}] != ""} {
+    return -1
+}
+if  {[gdb_compile ${srcdir}/${subdir}/$asm_file1 ${binfile}3.o \
+	  object {nodebug}] != ""} {
+    return -1
+}
+
+if  {[gdb_compile [list ${binfile}1.o ${binfile}2.o ${binfile}3.o] \
+	  "${binfile}" executable {}] != ""} {
+    return -1
 }
 
 clean_restart $execfile