introduce relative_filename and use it

This introduces a new relative_filename proc to gdb.exp and changes
some tests to use it.  This helps make these tests parallel-safe.

2013-11-04  Tom Tromey  <tromey@redhat.com>

	* gdb.base/fullname.exp: Use standard_output_file,
	relative_filename.
	* gdb.base/hashline1.exp: Use standard_testfile,
	standard_output_file, relative_filename, clean_restart.
	* gdb.base/hashline2.exp: Use standard_testfile,
	standard_output_file.
	* gdb.base/hashline3.exp: Use standard_testfile,
	standard_output_file, relative_filename.
	* lib/gdb.exp (relative_filename): New proc.

6 files changed, 56 insertions, 28 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index c913cbb..b171dc2 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,17 @@
 2013-11-04  Tom Tromey  <tromey@redhat.com>
 
+	* gdb.base/fullname.exp: Use standard_output_file,
+	relative_filename.
+	* gdb.base/hashline1.exp: Use standard_testfile,
+	standard_output_file, relative_filename, clean_restart.
+	* gdb.base/hashline2.exp: Use standard_testfile,
+	standard_output_file.
+	* gdb.base/hashline3.exp: Use standard_testfile,
+	standard_output_file, relative_filename.
+	* lib/gdb.exp (relative_filename): New proc.
+
+2013-11-04  Tom Tromey  <tromey@redhat.com>
+
 	* gdb.base/fileio.c (test_open, test_write, test_read)
 	(test_lseek, test_close, test_stat, test_fstat)
 	(test_isatty, test_system, test_rename, test_unlink):
diff --git a/gdb/testsuite/gdb.base/fullname.exp b/gdb/testsuite/gdb.base/fullname.exp
index 32f6ea4..2754f59 100644
--- a/gdb/testsuite/gdb.base/fullname.exp
+++ b/gdb/testsuite/gdb.base/fullname.exp
@@ -70,7 +70,8 @@ if { [gdb_breakpoint [standard_output_file tmp-${srcfile}]:${line} {no-message}]
 }
 
 # Build the test executable using a relative path.
-if  { [gdb_compile "${subdir}/tmp-${srcfile}" "${binfile}" executable {debug}] != "" } {
+if  { [gdb_compile [relative_filename [pwd] [standard_output_file tmp-${srcfile}]] \
+	   "${binfile}" executable {debug}] != "" } {
     return -1
 }
 
@@ -99,7 +100,7 @@ if { [gdb_breakpoint [standard_output_file tmp-${srcfile}]:${line} {no-message}]
 # we'll run GDB from.
 
 set save_pwd [pwd]
-cd ${subdir}
+cd [standard_output_file {}]
 if  { [gdb_compile [standard_output_file tmp-${srcfile}] "${testfile}" \
 	   executable {debug}] != "" } {
     cd $save_pwd
diff --git a/gdb/testsuite/gdb.base/hashline1.exp b/gdb/testsuite/gdb.base/hashline1.exp
index 950d67e..2330daf 100644
--- a/gdb/testsuite/gdb.base/hashline1.exp
+++ b/gdb/testsuite/gdb.base/hashline1.exp
@@ -21,28 +21,25 @@
 # srcfile is in objdir because we need to machine generate it in order
 # to get the correct path in the #line directive.
 
-set testfile "hashline1"
-set srcfile "${testfile}.c"
-set binfile "${objdir}/${subdir}/${testfile}"
+standard_testfile .c
 
-set fd [open ${objdir}/${subdir}/${srcfile} w]
-puts $fd "#line 2 \"[pwd]/${subdir}/${srcfile}\""
+set new_srcfile [standard_output_file $srcfile]
+set fd [open $new_srcfile w]
+puts $fd "#line 2 \"$new_srcfile\""
 puts $fd "int main () { return 0; } /* set breakpoint here */"
 close $fd
 
 # The choice of path name for the source file is important in order to trigger
-# the bug.  Using ${objdir}/${subdir}/${srcfile} here won't trigger the bug.
-if { [gdb_compile "./${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+# the bug.  Using $new_srcfile here won't trigger the bug.
+set compile_name [relative_filename $objdir $new_srcfile]
+if { [gdb_compile $compile_name "${binfile}" executable {debug}] != "" } {
     untested hashline1.exp
     return -1
 }
 
-gdb_exit
-gdb_start
-gdb_reinitialize_dir $srcdir/$subdir
-gdb_load ${binfile}
+clean_restart ${binfile}
 
-set bp_location [gdb_get_line_number "set breakpoint here" ${objdir}/${subdir}/${srcfile}]
+set bp_location [gdb_get_line_number "set breakpoint here" $new_srcfile]
 
 # Try to set a breakpoint on the specified file location.
 
diff --git a/gdb/testsuite/gdb.base/hashline2.exp b/gdb/testsuite/gdb.base/hashline2.exp
index d7ee4a7..cd748ca 100644
--- a/gdb/testsuite/gdb.base/hashline2.exp
+++ b/gdb/testsuite/gdb.base/hashline2.exp
@@ -21,16 +21,15 @@
 # srcfile is in objdir because we need to machine generate it in order
 # to get the correct path in the #line directive.
 
-set testfile "hashline2"
-set srcfile "${testfile}.c"
-set binfile "${objdir}/${subdir}/${testfile}"
+standard_testfile .c
 
-set fd [open ${objdir}/${subdir}/${srcfile} w]
-puts $fd "#line 2 \"///[pwd]/${subdir}/${srcfile}\""
+set new_srcfile [standard_output_file $srcfile]
+set fd [open $new_srcfile w]
+puts $fd "#line 2 \"///${new_srcfile}\""
 puts $fd "int main () { return 0; } /* set breakpoint here */"
 close $fd
 
-if { [gdb_compile "${objdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+if { [gdb_compile $new_srcfile "${binfile}" executable {debug}] != "" } {
     untested hashline2.exp
     return -1
 }
@@ -40,7 +39,7 @@ gdb_start
 gdb_reinitialize_dir $srcdir/$subdir
 gdb_load ${binfile}
 
-set bp_location [gdb_get_line_number "set breakpoint here" ${objdir}/${subdir}/${srcfile}]
+set bp_location [gdb_get_line_number "set breakpoint here" ${new_srcfile}]
 
 # Try to set a breakpoint on the specified file location.
 
diff --git a/gdb/testsuite/gdb.base/hashline3.exp b/gdb/testsuite/gdb.base/hashline3.exp
index 2496b3c..eba5f77 100644
--- a/gdb/testsuite/gdb.base/hashline3.exp
+++ b/gdb/testsuite/gdb.base/hashline3.exp
@@ -21,16 +21,16 @@
 # srcfile is in objdir because we need to machine generate it in order
 # to get the correct path in the #line directive.
 
-set testfile "hashline3"
-set srcfile "${testfile}.c"
-set binfile "${objdir}/${subdir}/${testfile}"
+standard_testfile
 
-set fd [open ${objdir}/${subdir}/${srcfile} w]
-puts $fd "#line 2 \"./${subdir}/${srcfile}\""
+set new_srcfile [standard_output_file $srcfile]
+set fd [open $new_srcfile w]
+set relative [relative_filename $objdir $new_srcfile]
+puts $fd "#line 2 \"./$relative\""
 puts $fd "int main () { return 0; } /* set breakpoint here */"
 close $fd
 
-if { [gdb_compile "${objdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+if { [gdb_compile $new_srcfile "${binfile}" executable {debug}] != "" } {
     untested hashline3.exp
     return -1
 }
@@ -40,7 +40,7 @@ gdb_start
 gdb_reinitialize_dir $srcdir/$subdir
 gdb_load ${binfile}
 
-set bp_location [gdb_get_line_number "set breakpoint here" ${objdir}/${subdir}/${srcfile}]
+set bp_location [gdb_get_line_number "set breakpoint here" $new_srcfile]
 
 # Try to set a breakpoint on the specified file location.
 
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 21a44af..7613761 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -4372,6 +4372,25 @@ proc set_remotetimeout { timeout } {
     }
 }
 
+# ROOT and FULL are file names.  Returns the relative path from ROOT
+# to FULL.  Note that FULL must be in a subdirectory of ROOT.
+# For example, given ROOT = /usr/bin and FULL = /usr/bin/ls, this
+# will return "ls".
+
+proc relative_filename {root full} {
+    set root_split [file split $root]
+    set full_split [file split $full]
+
+    set len [llength $root_split]
+
+    if {[eval file join $root_split]
+	!= [eval file join [lrange $full_split 0 [expr {$len - 1}]]]} {
+	error "$full not a subdir of $root"
+    }
+
+    return [eval file join [lrange $full_split $len end]]
+}
+
 # Log gdb command line and script if requested.
 if {[info exists TRANSCRIPT]} {
   rename send_gdb real_send_gdb