gdb: drop support for Microblaze

Microblaze support was never upstreamed in gdb. We currently use a gdb
from the Xilinx Github repository, but this gdb is based on 7.6, and
has never been updated in the last 4 years. There are no other active
branches at https://github.com/Xilinx/gdb/branches.

Xilinx has a slightly newer gdb, based on 7.7, available at
https://github.com/Xilinx/meta-xilinx/tree/master/recipes-microblaze/gdb. However,
it's apparently only available in the form of stack of big patches
(https://github.com/Xilinx/meta-xilinx/tree/master/recipes-microblaze/gdb/files).

Currently, gdb on Microblaze fails to build in various conditions:

 * Against glibc, with "error: conflicting types for 'ps_lgetfpregs'"

 * Against musl, with "error: unknown type name 'elf_gregset_t'"

While those issues can probably be fixed, the fact that there is no
active upstream significantly reduces the incentive to fix those
problems.

Therefore, let's drop support for gdb on Microblaze entirely.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/gdb/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_GDB_ARCH_SUPPORTS
 	default y
 	depends on !((BR2_arm || BR2_armeb) && BR2_BINFMT_FLAT)
 	depends on !BR2_bfin
+	depends on !BR2_microblaze
 	depends on !BR2_nios2
 	depends on !BR2_or1k
 
@@ -47,11 +48,11 @@ config BR2_PACKAGE_GDB_SERVER
 config BR2_PACKAGE_GDB_DEBUGGER
 	bool "full debugger"
 	depends on BR2_USE_WCHAR
-	depends on !BR2_sh && !BR2_microblaze
+	depends on !BR2_sh
 	select BR2_PACKAGE_NCURSES
 
 comment "full gdb on target needs a toolchain w/ wchar"
-	depends on !BR2_sh && !BR2_microblaze
+	depends on !BR2_sh
 	depends on !BR2_USE_WCHAR
 
 if BR2_PACKAGE_GDB_DEBUGGER

package/gdb/Config.in.host

@@ -7,6 +7,7 @@ config BR2_PACKAGE_HOST_GDB
 	# toolchain should be used.
 	depends on !BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY
 	depends on !((BR2_arm || BR2_armeb) && BR2_BINFMT_FLAT)
+	depends on !BR2_microblaze
 	depends on !BR2_nios2
 	depends on !BR2_or1k
 	help
@@ -29,7 +30,7 @@ config BR2_PACKAGE_HOST_GDB_PYTHON
 
 config BR2_PACKAGE_HOST_GDB_SIM
 	bool "Simulator support"
-	depends on !BR2_arc && !BR2_microblaze
+	depends on !BR2_arc
 	help
 	  This option enables the simulator support in the cross gdb.
 
@@ -37,7 +38,6 @@ choice
 	prompt "GDB debugger Version"
 	default BR2_GDB_VERSION_7_11
 	depends on !BR2_arc
-	depends on !BR2_microblaze
 	help
 	  Select the version of gdb you wish to use.
 
@@ -65,7 +65,6 @@ endif
 config BR2_GDB_VERSION
 	string
 	default "arc-2017.03-gdb" if BR2_arc
-	default "6be65fb56ea6694a9260733a536a023a1e2d4d57" if BR2_microblaze
 	default "7.10.1"   if BR2_GDB_VERSION_7_10
 	default "7.11.1"   if BR2_GDB_VERSION_7_11 || !BR2_PACKAGE_HOST_GDB
 	default "7.12.1"   if BR2_GDB_VERSION_7_12

package/gdb/gdb.hash

@@ -5,5 +5,4 @@ sha512  0ac8d0a495103611ef41167a08313a010dce6ca4c6d827cbe8558a0c1a1a8a6bfa53f1b7
 sha512  e4044bdd162cbf95044ec1eaa44d2fa62a33e051bdbbacbc97afd4dfb07bae1bea514381fc1966aede89d6796ef2377a15748a93d95e2ad494c8497db489e886	gdb-8.0.tar.xz
 
 # Locally calculated (fetched from Github)
-sha512  0a467091d4b01fbecabb4b8da1cb743025c70e7f4874a0b5c8fa2ec623569a39bde6762b91806de0be6e63711aeb6909715cfbe43860de73d8aec6159a9f10a7	gdb-6be65fb56ea6694a9260733a536a023a1e2d4d57.tar.gz
 sha512  8ec849a5ea1c16f104c51c4813c35ab229e460eef0025967673b87316f62b5171f05448cda018464914d43d2da50b2902eb7f9f060d0af1368a9db111f959668	gdb-arc-2017.03-gdb.tar.gz

package/gdb/gdb.mk

@@ -14,12 +14,6 @@ GDB_SOURCE = gdb-$(GDB_VERSION).tar.gz
 GDB_FROM_GIT = y
 endif
 
-ifeq ($(BR2_microblaze),y)
-GDB_SITE = $(call github,Xilinx,gdb,$(GDB_VERSION))
-GDB_SOURCE = gdb-$(GDB_VERSION).tar.gz
-GDB_FROM_GIT = y
-endif
-
 GDB_LICENSE = GPL-2.0+, LGPL-2.0+, GPL-3.0+, LGPL-3.0+
 GDB_LICENSE_FILES = COPYING COPYING.LIB COPYING3 COPYING3.LIB