[gdb/testsuite] Fix use of verbose in gdb/jit-*.exp

When running the gdb/jit-*.exp tests with runtest -v, I get:
...
ERROR: internal buffer is full.
UNRESOLVED: gdb.base/jit-elf-so.exp: one_jit_test-1: maintenance print objfiles
ERROR: internal buffer is full.
UNRESOLVED: gdb.base/jit-elf-so.exp: one_jit_test-2: maintenance print objfiles
ERROR: internal buffer is full.
UNRESOLVED: gdb.base/jit-elf.exp: one_jit_test-1: maintenance print objfiles
ERROR: internal buffer is full.
UNRESOLVED: gdb.base/jit-elf.exp: one_jit_test-2: maintenance print objfiles
ERROR: internal buffer is full.
UNRESOLVED: gdb.base/jit-elf.exp: attach: one_jit_test-2: maintenance print objfiles
ERROR: internal buffer is full.
UNRESOLVED: gdb.base/jit-elf.exp: PIE: one_jit_test-1: maintenance print objfiles
FAIL: gdb.base/jit-reader.exp: jit-reader-load
FAIL: gdb.base/jit-reader.exp: with jit-reader: before mangling: bt works
FAIL: gdb.base/jit-reader.exp: with jit-reader: after mangling: bt works
FAIL: gdb.base/jit-reader.exp: with jit-reader again: jit-reader-load
FAIL: gdb.base/jit-reader.exp: with jit-reader again: bt
...

This is the consequence of the use of global verbose in these tests, which is
used to change the actual test, rather than be more verbose about it.

Fix this by defining a global test_verbose in each test, and using that
instead.

Tested on x86_64-linux using runtest -v.

gdb/testsuite/ChangeLog:

2020-06-03  Tom de Vries  <tdevries@suse.de>

	PR testsuite/25609
	* gdb.base/jit-elf-so.exp: Don't modify testing behaviour based on
	value of global verbose.
	* gdb.base/jit-elf.exp: Same.
	* gdb.base/jit-reader.exp: Same.

4 files changed, 26 insertions, 8 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index ec6878f..21839c7 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2020-06-03  Tom de Vries  <tdevries@suse.de>
+
+	PR testsuite/25609
+	* gdb.base/jit-elf-so.exp: Don't modify testing behaviour based on
+	value of global verbose.
+	* gdb.base/jit-elf.exp: Same.
+	* gdb.base/jit-reader.exp: Same.
+
 2020-06-02  Tom de Vries  <tdevries@suse.de>
 
 	* gdb.dwarf2/multidictionary.exp: Don't use
diff --git a/gdb/testsuite/gdb.base/jit-elf-so.exp b/gdb/testsuite/gdb.base/jit-elf-so.exp
index 51c1d33..193d330 100644
--- a/gdb/testsuite/gdb.base/jit-elf-so.exp
+++ b/gdb/testsuite/gdb.base/jit-elf-so.exp
@@ -28,6 +28,9 @@ if {[get_compiler_info]} {
 
 load_lib jit-elf-helpers.exp
 
+# Increase this to see more detail.
+set test_verbose 0
+
 # The "real" main of this test, which loads jit-elf-main
 # as a shared library.
 set main_loader_basename jit-elf-dlmain
@@ -73,7 +76,7 @@ proc compile_jit_dlmain {options} {
 proc one_jit_test {solib_binfiles_target match_str} {
     set count [llength $solib_binfiles_target]
     with_test_prefix "one_jit_test-$count" {
-	global verbose
+	global test_verbose
 	global main_loader_binfile main_loader_srcfile
 	global main_solib_binfile main_solib_srcfile
 
@@ -81,7 +84,7 @@ proc one_jit_test {solib_binfiles_target match_str} {
 	gdb_load_shlib $main_solib_binfile
 
 	# This is just to help debugging when things fail
-	if {$verbose > 0} {
+	if {$test_verbose > 0} {
 	    gdb_test "set debug jit 1"
 	}
 
@@ -121,7 +124,7 @@ proc one_jit_test {solib_binfiles_target match_str} {
 	gdb_test "info function jit_function" "$match_str"
 
 	# This is just to help debugging when things fail
-	if {$verbose > 0} {
+	if {$test_verbose > 0} {
 	    gdb_test "maintenance print objfiles"
 	    gdb_test "maintenance info break"
 	}
diff --git a/gdb/testsuite/gdb.base/jit-elf.exp b/gdb/testsuite/gdb.base/jit-elf.exp
index 78a19c2..b9c2318 100644
--- a/gdb/testsuite/gdb.base/jit-elf.exp
+++ b/gdb/testsuite/gdb.base/jit-elf.exp
@@ -25,6 +25,9 @@ if {[get_compiler_info]} {
 
 load_lib jit-elf-helpers.exp
 
+# Increase this to see more detail.
+set test_verbose 0
+
 # The main code that loads and registers JIT objects.
 set main_basename "jit-elf-main"
 set main_srcfile ${srcdir}/${subdir}/${main_basename}.c
@@ -82,13 +85,13 @@ proc one_jit_test {jit_solibs_target match_str reattach} {
     set count [llength $jit_solibs_target]
 
     with_test_prefix "one_jit_test-$count" {
-	global verbose
+	global test_verbose
 	global main_binfile main_srcfile
 
 	clean_restart ${main_binfile}
 
 	# This is just to help debugging when things fail
-	if {$verbose > 0} {
+	if {$test_verbose > 0} {
 	    gdb_test "set debug jit 1"
 	}
 
@@ -117,7 +120,7 @@ proc one_jit_test {jit_solibs_target match_str reattach} {
 	gdb_test "info function ^jit_function" "$match_str"
 
 	# This is just to help debugging when things fail
-	if {$verbose > 0} {
+	if {$test_verbose > 0} {
 	    gdb_test "maintenance print objfiles"
 	    gdb_test "maintenance info break"
 	}
diff --git a/gdb/testsuite/gdb.base/jit-reader.exp b/gdb/testsuite/gdb.base/jit-reader.exp
index c0af2fc..1821bdc 100644
--- a/gdb/testsuite/gdb.base/jit-reader.exp
+++ b/gdb/testsuite/gdb.base/jit-reader.exp
@@ -32,6 +32,10 @@ if {[get_compiler_info]} {
     return 1
 }
 
+
+# Increase this to see more detail.
+set test_verbose 0
+
 set jit_host_src $srcfile
 set jit_host_bin $binfile
 
@@ -104,7 +108,7 @@ proc info_registers_current_frame {sp} {
 proc jit_reader_test {} {
     global jit_host_bin
     global jit_reader_bin
-    global verbose
+    global test_verbose
     global hex decimal
 
     set any "\[^\r\n\]*"
@@ -112,7 +116,7 @@ proc jit_reader_test {} {
     clean_restart $jit_host_bin
     gdb_load_shlib $jit_reader_bin
 
-    if {$verbose > 0} {
+    if {$test_verbose > 0} {
 	gdb_test_no_output "set debug jit 1"
     }