gdb/testsuite: use with_cwd where possible

I learned about with_cwd today.  I spotted a few spots that could use
it, to make the code more robust.

Change-Id: Ia23664cb827f25e79d31948e0c006a8dc61c33e1

gdb/testsuite/gdb.base/completion.exp

@@ -675,10 +675,9 @@ gdb_test "complete whatis &values\[0\]->z" \
 
 # ${srcdir} may be a relative path.  We want to make sure we end up
 # in the right directory - so make sure we know where it is.
-set mydir [pwd]
-cd ${srcdir}
-set fullsrcdir [pwd]
-cd ${mydir}
+with_cwd $srcdir {
+    set fullsrcdir [pwd]
+}
 
 # If the directory name contains a '+' we must escape it, adding a backslash.
 # If not, the test below will fail because it will interpret the '+' as a 

gdb/testsuite/gdb.base/fullname.exp

@@ -99,14 +99,12 @@ if { [gdb_breakpoint [standard_output_file tmp-${srcfile}]:${line} {no-message}]
 # Build the test executable using relative paths not relative to the directory
 # we'll run GDB from.
 
-set save_pwd [pwd]
-cd [standard_output_file {}]
-if  { [gdb_compile [standard_output_file tmp-${srcfile}] "${testfile}" \
-	   executable {debug}] != "" } {
-    cd $save_pwd
-    return -1
+with_cwd [standard_output_file {}] {
+    if  { [gdb_compile [standard_output_file tmp-${srcfile}] "${testfile}" \
+	       executable {debug}] != "" } {
+	return -1
+    }
 }
-cd $save_pwd
 
 gdb_exit
 gdb_start

gdb/testsuite/gdb.base/fullpath-expand.exp

@@ -25,13 +25,13 @@ if { [file pathtype $objdir] != "absolute" } {
     return -1
 }
 
-set saved_pwd [pwd]
-cd $srcdir
-set err [gdb_compile "${subdir}/${srcfile} ${subdir}/${srcfile2}" $binfile executable {debug}]
-cd $saved_pwd
-if { $err != "" } {
-    untested "${srcfile} or ${srcfile2} compilation failed"
-    return -1
+with_cwd $srcdir {
+    set err [gdb_compile "${subdir}/${srcfile} ${subdir}/${srcfile2}" $binfile executable {debug}]
+
+    if { $err != "" } {
+	untested "${srcfile} or ${srcfile2} compilation failed"
+	return -1
+    }
 }
 
 set result [catch "exec realpath ${srcdir}/${subdir}/${srcfile2}" realsrcfile2]

gdb/testsuite/gdb.base/settings.exp

@@ -585,11 +585,9 @@ proc test-string {variant} {
 	# ${srcdir} may be a relative path.  We want to make sure we
 	# end up in the right directory - so make sure we know where
 	# it is.
-	global srcdir
-	set mydir [pwd]
-	cd ${srcdir}
-	set fullsrcdir [pwd]
-	cd ${mydir}
+	with_cwd $::srcdir {
+	    set fullsrcdir [pwd]
+	}
 
 	gdb_test "cd ${fullsrcdir}" \
 	    "Working directory [string_to_regexp ${fullsrcdir}].*" \

gdb/testsuite/gdb.base/source-dir.exp

@@ -87,31 +87,28 @@ proc test_truncated_comp_dir {} {
         return
     }
 
-    set original_dir [pwd]
     set working_dir [standard_output_file ""]
-    cd ${working_dir}
+    with_cwd $working_dir {
+	set strip_dir [file normalize "${working_dir}/../.."]
 
-    set strip_dir [file normalize "${working_dir}/../.."]
+	set new_srcfile [standard_output_file ${srcfile}]
+	set fd [open "$new_srcfile" w]
+	puts $fd "int
+	main ()
+	{
+	  return 0;
+	}"
+	close $fd
 
-    set new_srcfile [standard_output_file ${srcfile}]
-    set fd [open "$new_srcfile" w]
-    puts $fd "int
-    main ()
-    {
-      return 0;
-    }"
-    close $fd
-
-    set options \
-	"debug additional_flags=-fdebug-prefix-map=${strip_dir}="
-    if  { [gdb_compile "${srcfile}" "${binfile}" \
-	       executable ${options}] != "" } {
-	untested "failed to compile"
-	return -1
+	set options \
+	    "debug additional_flags=-fdebug-prefix-map=${strip_dir}="
+	if  { [gdb_compile "${srcfile}" "${binfile}" \
+		   executable ${options}] != "" } {
+	    untested "failed to compile"
+	    return -1
+	}
     }
 
-    cd ${original_dir}
-
     clean_restart ${binfile}
 
     if { [ishost *-*-mingw*] } {

gdb/testsuite/gdb.linespec/break-ask.exp

@@ -28,16 +28,19 @@ if { [file pathtype $objdir] == "relative" } {
     untested "objdir $objdir should be absolute"
     return
 }
-set saved_pwd [pwd]
-cd $srcdir/${subdir}/base/one
-set err1 [gdb_compile "thefile.cc" $objfile1 object $opts]
-cd $saved_pwd
-cd $srcdir/${subdir}/base/two
-set err2 [gdb_compile "thefile.cc" $objfile2 object $opts]
-cd $saved_pwd
-if { $err1 != "" || $err2 != "" } {
-    untested "compilation failed"
-    return -1
+
+with_cwd $srcdir/${subdir}/base/one {
+    if { [gdb_compile "thefile.cc" $objfile1 object $opts] != "" } {
+	untested "compilation failed"
+	return
+    }
+}
+
+with_cwd $srcdir/${subdir}/base/two {
+    if { [gdb_compile "thefile.cc" $objfile2 object $opts] != "" } {
+	untested "compilation failed"
+	return
+    }
 }
 
 if { [gdb_compile "$srcdir/${subdir}/$srcfile $objfile1 $objfile2" \

gdb/testsuite/gdb.linespec/macro-relative.exp

@@ -32,13 +32,12 @@ if { [file pathtype $objdir] == "relative" } {
     untested "objdir $objdir should be absolute"
     return
 }
-set saved_pwd [pwd]
-cd $srcdir/${subdir}/base/two
-set err [gdb_compile "../../${srcfile}" "${binfile}" executable $opts]
-cd $saved_pwd
-if { $err != "" } {
-    untested "compilation failed"
-    return -1
+
+with_cwd $srcdir/${subdir}/base/two {
+    if { [gdb_compile "../../${srcfile}" "${binfile}" executable $opts] != "" } {
+	untested "compilation failed"
+	return
+    }
 }
 
 clean_restart ${testfile}

gdb/testsuite/lib/ada.exp

@@ -18,8 +18,6 @@
 # BUILDDIR.
 
 proc target_compile_ada_from_dir {builddir source dest type options} {
-    set saved_cwd [pwd]
-
     global board
     set board [target_info name]
     set save_multilib_flag [board_info $board multilib_flags]
@@ -39,10 +37,10 @@ proc target_compile_ada_from_dir {builddir source dest type options} {
     }
 
     catch {
-        cd $builddir
-        return [target_compile $source $dest $type $options]
+	with_cwd $builddir {
+	    return [target_compile $source $dest $type $options]
+	}
     } result options
-    cd $saved_cwd
 
     if { $save_multilib_flag != "" } {
 	unset_board_info "multilib_flags"