[PATCH 1/5] gdb/testsuite: Fix style.exp failures on targets without argc/argv support

[Sandra Loosemore <sandra@codesourcery.com>]

Some embedded targets don't have full support for argc/argv.  argv
may print as "0x0" or as an address with a symbol name following.
This causes problems for the regexps in the style.exp line-wrapping
tests that assume it always prints as an ordinary address in backtrace
output.

This patch generalizes the regexps to handle these additional forms
and reworks some of the line-wrapping tests to account for the argv
address string being shorter or longer than a regular address.
---
 gdb/testsuite/gdb.base/style.exp | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/gdb/testsuite/gdb.base/style.exp b/gdb/testsuite/gdb.base/style.exp
index 0370550d251..60f909e2402 100644
--- a/gdb/testsuite/gdb.base/style.exp
+++ b/gdb/testsuite/gdb.base/style.exp
@@ -92,7 +92,7 @@ proc run_style_tests { } {
 
 	set argv ""
 	gdb_test_multiple "frame" "frame without styling" {
-	    -re -wrap "main \\(argc=.*, (argv=$hex)\\).*style\\.c:\[0-9\].*" {
+	    -re -wrap "main \\(argc=.*, (argv=$hex.*)\\).*style\\.c:\[0-9\].*" {
 		set argv $expect_out(1,string)
 		pass $gdb_test_name
 	    }
@@ -105,9 +105,13 @@ proc run_style_tests { } {
 	set file_expr "$base_file_expr:\[0-9\]+"
 	set arg_expr [limited_style "arg." variable]
 
+	# On some embedded targets that don't fully support argc/argv,
+	# argv may print as "0x0" or as an address with a symbol name
+	# following, so use a regexp general enough to match that and
+	# do not make assumptions about how long the address string is.
 	gdb_test "frame" \
 	    [multi_line \
-		 "#0\\s+$main_expr\\s+\\($arg_expr=$decimal,\\s+$arg_expr=$hex\\)\\s+at\\s+$file_expr" \
+		 "#0\\s+$main_expr\\s+\\($arg_expr=$decimal,\\s+$arg_expr=$hex.*\\)\\s+at\\s+$file_expr" \
 		 "\[0-9\]+\\s+.*return.* break here .*"]
 	gdb_test "info breakpoints" "$main_expr at $file_expr.*"
 
@@ -134,16 +138,21 @@ proc run_style_tests { } {
 	    # the line listing; this is why the words from the source
 	    # code are spelled out in the final result line of the
 	    # test.
+	    set re0_styled \
+		[multi_line \
+		     "#0\\s+$main_expr\\s+\\($arg_expr=$decimal,\\s+$arg_expr=$hex\\)" \
+		     "\\s+at\\s+$file_expr" \
+		     "\[0-9\]+\\s+.*return.* break here .*"]
 	    set re1_styled \
 		[multi_line \
 		     "#0\\s+$main_expr\\s+\\($arg_expr=$decimal,\\s+" \
-		     "\\s+$arg_expr=$hex\\)" \
+		     "\\s+$arg_expr=$hex.*\\)" \
 		     "\\s+at\\s+$file_expr" \
 		     "\[0-9\]+\\s+.*return.* break here .*"]
 	    set re2_styled \
 		[multi_line \
 		     "#0\\s+$main_expr\\s+\\($arg_expr=.*" \
-		     "\\s+$arg_expr=$hex\\)\\s+at\\s+$file_expr" \
+		     "\\s+$arg_expr=$hex.*\\)\\s+at\\s+$file_expr" \
 		     "\[0-9\]+\\s+.*return.* break here .*"]
 
 	    # The length of the line containing argv containing:
@@ -152,7 +161,11 @@ proc run_style_tests { } {
 	    # - closing parenthesis
 	    set line_len [expr 4 + $argv_len + 1]
 
-	    if { $line_len > $width } {
+	    if { $argv == "argv=0x0" && $width >= 27 } {
+		# Embedded target with no argv support.
+		# #0  main (argc=0, argv=0x0)
+		set re_styled $re0_styled
+	    } elseif { $line_len > $width } {
 		# At on the next line.
 		set re_styled $re1_styled
 	    } else {
-- 
2.31.1