[binutils-gdb] Disable gdbserver on host != target configurations

[Pedro Alves]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f20e3e823d56e54ffe56792ea6a2fe947c2dec0d

commit f20e3e823d56e54ffe56792ea6a2fe947c2dec0d
Author: Maciej W. Rozycki <macro@wdc.com>
Date:   Wed Feb 12 13:50:30 2020 +0000

    Disable gdbserver on host != target configurations
    
    Correct fallout from commit 919adfe84092 ("Move gdbserver to top level")
    and revert to not building `gdbserver' in a cross-configuration, that is
    where host != target, matching the documented behaviour.  We have no way
    to support non-native `gdbserver', and native `gdbserver' is usually of
    no use with cross-GDB of the chosen host.
    
    gdbserver/ChangeLog:
    2020-02-12  Maciej W. Rozycki <macro@wdc.com>
    	    Pedro Alves  <palves@redhat.com>
    
    	Skip building gdbserver in a cross-configuration.
    	* configure.srv: Set $gdbserver_host depending on whether $target
    	is $host.  Use $gdbserver_host instead of $host.

Diff:
---
 gdbserver/ChangeLog     |  7 +++++++
 gdbserver/configure.srv | 11 +++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog
index 0970706..709ef23 100644
--- a/gdbserver/ChangeLog
+++ b/gdbserver/ChangeLog
@@ -1,3 +1,10 @@
+2020-02-12  Maciej W. Rozycki <macro@wdc.com>
+	    Pedro Alves  <palves@redhat.com>
+
+	Skip building gdbserver in a cross-configuration.
+	* configure.srv: Set $gdbserver_host depending on whether $target
+	is $host.  Use $gdbserver_host instead of $host.
+
 2020-02-11  Simon Marchi  <simon.marchi@efficios.com>
 
 	* configure: Re-generate.
diff --git a/gdbserver/configure.srv b/gdbserver/configure.srv
index 2e83cbd..375ac0a 100644
--- a/gdbserver/configure.srv
+++ b/gdbserver/configure.srv
@@ -33,9 +33,16 @@ ipa_ppc_linux_regobj="powerpc-32l-ipa.o powerpc-altivec32l-ipa.o powerpc-vsx32l-
 # these files over and over again.
 srv_linux_obj="linux-low.o nat/linux-osdata.o nat/linux-procfs.o nat/linux-ptrace.o nat/linux-waitpid.o nat/linux-personality.o nat/linux-namespaces.o fork-child.o nat/fork-inferior.o"
 
-# Input is taken from the "${host}" variable.
+# Input is taken from the "${host}" and "${target}" variables.
 
-case "${host}" in
+# GDBserver can only debug native programs.
+if test "${target}" = "${host}"; then
+    gdbserver_host=${host}
+else
+    gdbserver_host=
+fi
+
+case "${gdbserver_host}" in
   aarch64*-*-linux*)	srv_tgtobj="linux-aarch64-low.o"
 			srv_tgtobj="$srv_tgtobj nat/aarch64-linux-hw-point.o"
 			srv_tgtobj="$srv_tgtobj linux-aarch32-low.o"