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".

1 files changed, 0 insertions, 6 deletions

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
 	}