package/gdb: prevent gdbserver being selected for or1k builds

There is currently no version of gdbserver for or1k. Until this
is implemented we will prevent both the direct and indirect
selection of gdbserver for or1k builds. In practice this means
that 'cross gdb for the host' cannot be selected and that
'full debugger' must be automatically selected for the gdb target
package.

This partially reverts commit 991b7b990ad8cd4a37564cd91d5bb0ee7e1e9f11
which claimed that gdbserver for or1k was already supported before
version 8.3. That is not true - the commit that adds gdbserver support
for or1k [1] was only merged for version 12.1, which hasn't been
integrated in Buildroot yet.

Without that support, the build of gdbserver fails with

/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/or1k-buildroot-linux-musl/11.2.0/../../../../or1k-buildroot-linux-musl/bin/ld: server.o: in function `main':
server.cc:(.text.startup+0x6dc): undefined reference to `initialize_low()'
/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/or1k-buildroot-linux-musl/11.2.0/../../../../or1k-buildroot-linux-musl/bin/ld: remote-utils.o: in function `prepare_resume_reply(char*, ptid_t, target_waitstatus*)':
remote-utils.cc:(.text+0x28a8): undefined reference to `using_threads'
/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/or1k-buildroot-linux-musl/11.2.0/../../../../or1k-buildroot-linux-musl/bin/ld: remote-utils.cc:(.text+0x28b0): undefined reference to `using_threads'

Fixes: http://autobuild.buildroot.net/results/b3c/b3c0df53d09d9facaf0c3c2bc4529f9fcf7737ee

[1] https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=4933265c3f71b9134363d0c05f09542d5cc677f4

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Stafford Horne <shorne@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/gdb/Config.in

@@ -17,6 +17,8 @@ config BR2_PACKAGE_GDB
 	depends on BR2_PACKAGE_GDB_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 	depends on BR2_INSTALL_LIBSTDCPP
+	# no gdbserver on or1k
+	select BR2_PACKAGE_GDB_DEBUGGER if BR2_or1k
 	# When the external toolchain gdbserver is copied to the
 	# target, we don't allow building a separate gdbserver. The
 	# one from the external toolchain should be used.
@@ -43,6 +45,7 @@ if BR2_PACKAGE_GDB
 config BR2_PACKAGE_GDB_SERVER
 	bool "gdbserver"
 	depends on !BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY
+	depends on !BR2_or1k
 	help
 	  Build the gdbserver stub to run on the target.
 	  A full gdb is needed to debug the progam.

package/gdb/Config.in.host

@@ -3,6 +3,7 @@ config BR2_PACKAGE_HOST_GDB_ARCH_SUPPORTS
 	default y
 	depends on !((BR2_arm || BR2_armeb) && BR2_BINFMT_FLAT)
 	depends on !BR2_microblaze
+	depends on !BR2_or1k
 
 comment "Host GDB Options"
 	depends on !BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY