Remove useless gcore command detection

Checking whether the gcore command is included in the GDB build as
proxy for checking whether core dumping is supported by the target is
useless, as gcore.o has been in COMMON_OBS since git 9b4eba8e:

    2009-10-26  Michael Snyder  <msnyder@vmware.com>
                Hui Zhu  <teawater@gmail.com>

        * Makefile.in (SFILES): Add gcore.c.
        (COMMON_OBS): Add gcore.o.
        * config/alpha/alpha-linux.mh (NATDEPFILES): Delete gcore.o.
        * config/alpha/fbsd.mh (NATDEPFILES): Ditto.
	...

IOW, the command is always included in the build.

Instead, nowadays, tests bail out if actually trying to generate a
core fails with an indication the target doesn't support it.  See
gdb_gcore_cmd and callers.

Tested on x86_64 Fedora 20.

gdb/testsuite/ChangeLog:

	* gdb.base/gcore-buffer-overflow.exp: Remove "help gcore" test.
	* gdb.base/gcore-relro-pie.exp: Likewise.
	* gdb.base/gcore-relro.exp: Likewise.
	* gdb.base/gcore.exp: Likewise.
	* gdb.base/print-symbol-loading.exp: Likewise.
	* gdb.threads/gcore-thread.exp: Likewise.
	* lib/gdb.exp (gdb_gcore_cmd): Don't expect "Undefined command".

8 files changed, 10 insertions, 80 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index a9205d1..31c64ff 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,13 @@
+2014-08-21  Pedro Alves  <palves@redhat.com>
+
+	* gdb.base/gcore-buffer-overflow.exp: Remove "help gcore" test.
+	* gdb.base/gcore-relro-pie.exp: Likewise.
+	* gdb.base/gcore-relro.exp: Likewise.
+	* gdb.base/gcore.exp: Likewise.
+	* gdb.base/print-symbol-loading.exp: Likewise.
+	* gdb.threads/gcore-thread.exp: Likewise.
+	* lib/gdb.exp (gdb_gcore_cmd): Don't expect "Undefined command".
+
 2014-08-20  Pedro Alves  <palves@redhat.com>
 	    Jan Kratochvil  <jan.kratochvil@redhat.com>
 
diff --git a/gdb/testsuite/gdb.base/gcore-buffer-overflow.exp b/gdb/testsuite/gdb.base/gcore-buffer-overflow.exp
index 1951301..f7a69ba 100644
--- a/gdb/testsuite/gdb.base/gcore-buffer-overflow.exp
+++ b/gdb/testsuite/gdb.base/gcore-buffer-overflow.exp
@@ -31,18 +31,6 @@ if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {deb
 
 clean_restart ${binfile}
 
-# Does this gdb support gcore?
-gdb_test_multiple "help gcore" "help gcore" {
-    -re "Undefined command: .gcore.*$gdb_prompt $" {
-	# gcore command not supported -- nothing to test here.
-	unsupported "gdb does not support gcore on this target"
-	return -1
-    }
-    -re "Save a core file .*$gdb_prompt $" {
-	pass "help gcore"
-    }
-}
-
 gdb_test_no_output "set args ${pattern}"	\
     "Set buffer exceeding arguments"
 
diff --git a/gdb/testsuite/gdb.base/gcore-relro-pie.exp b/gdb/testsuite/gdb.base/gcore-relro-pie.exp
index e0c0de0..468e846 100644
--- a/gdb/testsuite/gdb.base/gcore-relro-pie.exp
+++ b/gdb/testsuite/gdb.base/gcore-relro-pie.exp
@@ -39,19 +39,6 @@ file attributes ${stripped_binfile} -permissions $perm
 
 clean_restart ${stripped_binfile}
 
-# Does this gdb support gcore?
-set test "help gcore"
-gdb_test_multiple $test $test {
-    -re "Undefined command: .gcore.*\r\n$gdb_prompt $" {
-	# gcore command not supported -- nothing to test here.
-	unsupported "gdb does not support gcore on this target"
-	return -1
-    }
-    -re "Save a core file .*\r\n$gdb_prompt $" {
-	pass $test
-    }
-}
-
 # The binary is stripped of debug info, but not minsyms.
 if ![runto break_here] {
     fail "Can't run to break_here"
diff --git a/gdb/testsuite/gdb.base/gcore-relro.exp b/gdb/testsuite/gdb.base/gcore-relro.exp
index 8278de2..d5f4b69 100644
--- a/gdb/testsuite/gdb.base/gcore-relro.exp
+++ b/gdb/testsuite/gdb.base/gcore-relro.exp
@@ -38,19 +38,6 @@ set objfile [standard_output_file ${testfile}.o]
 clean_restart ${binfile}
 gdb_load_shlibs ${binfile_lib}
 
-# Does this gdb support gcore?
-set test "help gcore"
-gdb_test_multiple $test $test {
-    -re "Undefined command: .gcore.*\r\n$gdb_prompt $" {
-	# gcore command not supported -- nothing to test here.
-	unsupported "gdb does not support gcore on this target"
-	return -1
-    }
-    -re "Save a core file .*\r\n$gdb_prompt $" {
-	pass $test
-    }
-}
-
 if ![runto lib] {
     return -1
 }
diff --git a/gdb/testsuite/gdb.base/gcore.exp b/gdb/testsuite/gdb.base/gcore.exp
index c28a9b3..15de624 100644
--- a/gdb/testsuite/gdb.base/gcore.exp
+++ b/gdb/testsuite/gdb.base/gcore.exp
@@ -24,18 +24,6 @@ if {[prepare_for_testing $testfile.exp $testfile $srcfile debug]} {
     return -1
 }
 
-# Does this gdb support gcore?
-gdb_test_multiple "help gcore" "help gcore" {
-    -re "Undefined command: .gcore.*$gdb_prompt $" {
-	# gcore command not supported -- nothing to test here.
-	unsupported "gdb does not support gcore on this target"
-	return -1
-    }
-    -re "Save a core file .*$gdb_prompt $" {
-	pass "help gcore"
-    }
-}
-
 if { ! [ runto_main ] } then {
     untested gcore.exp
     return -1
diff --git a/gdb/testsuite/gdb.base/print-symbol-loading.exp b/gdb/testsuite/gdb.base/print-symbol-loading.exp
index 1abfa2a..0686d0e 100644
--- a/gdb/testsuite/gdb.base/print-symbol-loading.exp
+++ b/gdb/testsuite/gdb.base/print-symbol-loading.exp
@@ -40,19 +40,6 @@ if { [gdb_compile ${objfile} ${binfile} executable $opts] != "" } {
 clean_restart ${binfile}
 gdb_load_shlibs ${binfile_lib}
 
-# Does this gdb support gcore?
-set test "help gcore"
-gdb_test_multiple $test $test {
-    -re "Undefined command: .gcore.*\r\n$gdb_prompt $" {
-	# gcore command not supported -- nothing to test here.
-	unsupported "gdb does not support gcore on this target"
-	return -1
-    }
-    -re "Save a core file .*\r\n$gdb_prompt $" {
-	pass $test
-    }
-}
-
 if ![runto lib] {
     return -1
 }
diff --git a/gdb/testsuite/gdb.threads/gcore-thread.exp b/gdb/testsuite/gdb.threads/gcore-thread.exp
index 6e0e81e..3014de9 100644
--- a/gdb/testsuite/gdb.threads/gcore-thread.exp
+++ b/gdb/testsuite/gdb.threads/gcore-thread.exp
@@ -55,17 +55,6 @@ set nl "\[\r\n\]+"
 
 set timeout 30
 
-gdb_test_multiple "help gcore" "help gcore" {
-    -re "Undefined command: .gcore.*$gdb_prompt $" {
-	# gcore command not supported -- nothing to test here.
-	unsupported "gdb does not support gcore on this target"
-	return -1
-    }
-    -re "Save a core file .*$gdb_prompt $" {
-	pass "help gcore"
-    }
-}
-
 if { ! [ runto_main ] } then {
     untested gcore-thread.exp
     return -1
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 92069c9..61e1614 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -3401,12 +3401,6 @@ proc gdb_gcore_cmd {core test} {
 	    pass $test
 	    set result 1
 	}
-
-	-re "Undefined command.*$gdb_prompt $" {
-	    unsupported $test
-	    verbose -log "'gcore' command undefined in gdb_gcore_cmd"
-	}
-
 	-re "(?:Can't create a corefile|Target does not support core file generation\\.)\[\r\n\]+$gdb_prompt $" {
 	    unsupported $test
 	}