[RFA] Ensure deterministic result order in gdb.ada/info_auto_lang.exp

[Philippe Waroquiers <philippe.waroquiers@skynet.be>]

standard_ada_testfile, standard_test_file and the explicit
csrcfile assignment in info_auto_lang.exp all gives similar pathnames
prefix for a source, such as
/home/philippe/gdb/git/build_binutils-gdb/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.<something>.

However, the gnat compiler normalizes Ada sources path when compiling.
So, the 'Ada' .o object are referencing a pathname such as
/home/philippe/gdb/git/binutils-gdb/gdb/testsuite/gdb.ada/info_auto_lang/proc_in_ada.adb,
while the 'C' .o object still references the not normalized pathname.

As the results of 'info functions | ...' are sorted by pathname first,
the order of the results depends on the comparison between different directories,
leading to results that can change depending on these directories.

=> Ensure the result order is always the same, by normalising the C source file.

Tested by running the testcase in 2 different builds, that without normalize
were giving different results.

Note: such 'set csrcfile' is used in 4 other tests mixing Ada and C.
If deemed better (Joel?), I can factorize building such a csrcfile
and normalizing it in an ada.exp standard_csrcfile_for_ada function.

gdb/testsuite/ChangeLog
2018-12-01  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* gdb.ada/info_auto_lang.exp: Normalize some_c source file.
	Update order of results accordingly.
---
 gdb/testsuite/gdb.ada/info_auto_lang.exp | 38 +++++++++++++-----------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/gdb/testsuite/gdb.ada/info_auto_lang.exp b/gdb/testsuite/gdb.ada/info_auto_lang.exp
index 4ba79fff42..31d706241a 100644
--- a/gdb/testsuite/gdb.ada/info_auto_lang.exp
+++ b/gdb/testsuite/gdb.ada/info_auto_lang.exp
@@ -24,7 +24,11 @@ load_lib "ada.exp"
 
 standard_ada_testfile proc_in_ada
 set cfile "some_c"
-set csrcfile ${srcdir}/${subdir}/${testdir}/${cfile}.c
+# gnat normalizes proc_in_ada source file when compiling.
+# As the 'info' commands results are sorted by absolute path names, also normalize
+# the some_c source file to ensure that the 'info' results are always
+# giving Ada results first.
+set csrcfile [file normalize ${srcdir}/${subdir}/${testdir}/${cfile}.c]
 set cobject [standard_output_file ${cfile}.o]
 
 if { [gdb_compile "${csrcfile}" "${cobject}" object [list debug]] != "" } {
@@ -111,41 +115,41 @@ foreach_with_prefix language_choice { "auto" "ada" "c" } {
 		[multi_line \
 		     "All functions matching regular expression \"proc_in_\":" \
 		     "" \
-		     "File .*some_c.c:" \
-		     $func_in_c($c_match) \
-		     "" \
 		     "File .*proc_in_ada.adb:" \
-		     $func_in_ada($ada_match)
+		     $func_in_ada($ada_match) \
+		     "" \
+		     "File .*some_c.c:" \
+		     $func_in_c($c_match)
 		]
 
 	    gdb_test "info types some_type" \
 		[multi_line \
-		     "All types matching regular expression \"some_type\":" \
-		     "" \
-		     "File .*some_c.c:" \
-		     $type_in_c($c_match) \
+		     "All types matching regular expression \"some_type\":"  \
 		     "" \
 		     "File .*global_pack.ads:" \
-		     $type_in_ada($ada_match)
+		     $type_in_ada($ada_match)\
+		     "" \
+		     "File .*some_c.c:" \
+		     $type_in_c($c_match)
 		]
 
 	    gdb_test "info variables some_struct" \
 		[multi_line \
 		     "All variables matching regular expression \"some_struct\":" \
 		     "" \
-		     "File .*some_c.c:" \
-		     $var_in_c($c_match) \
-		     "" \
 		     "File .*global_pack.ads:" \
-		     $var_in_ada($ada_match)
+		     $var_in_ada($ada_match) \
+		     "" \
+		     "File .*some_c.c:" \
+		     $var_in_c($c_match)
 		]
 
 	    gdb_test "rbreak proc_in_" \
 		[multi_line \
-		     "Breakpoint.*file .*some_c.c,.*" \
-		     $rbreak_func_in_c($c_match) \
 		     "Breakpoint.*file .*proc_in_ada.adb,.*" \
-		     $rbreak_func_in_ada($ada_match)
+		     $rbreak_func_in_ada($ada_match) \
+		     "Breakpoint.*file .*some_c.c,.*" \
+		     $rbreak_func_in_c($c_match)
 		]
 	    delete_breakpoints
 	}
-- 
2.19.2