[kvm-unit-tests PATCH 29/32] configure: Fail on unknown arch

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configure will accept an unknown arch, and if it is the name of a
directory in the source tree the command will silently succeed. Make
it only accept supported arch names.

Also print the full path of a missing test directory to disambiguate
the error in out of tree builds.

Cc: Alexandru Elisei <alexandru.elisei@xxxxxxx>
Cc: Andrew Jones <andrew.jones@xxxxxxxxx>
Cc: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Eric Auger <eric.auger@xxxxxxxxxx>
Cc: Janosch Frank <frankja@xxxxxxxxxxxxx>
Cc: Laurent Vivier <lvivier@xxxxxxxxxx>
Cc: Nico Böhr <nrb@xxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Thomas Huth <thuth@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: kvmarm@xxxxxxxxxxxxxxx
Cc: kvm-riscv@xxxxxxxxxxxxxxxxxxx
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
 configure | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 6907ccbbb..ae522c556 100755
--- a/configure
+++ b/configure
@@ -45,7 +45,8 @@ usage() {
 	Usage: $0 [options]
 	Options include:
-	    --arch=ARCH            architecture to compile for ($arch)
+	    --arch=ARCH            architecture to compile for ($arch). ARCH can be one of:
+	                           arm, arm64, i386, ppc64, riscv32, riscv64, s390x, x86_64
 	    --processor=PROCESSOR  processor to compile for ($arch)
 	    --target=TARGET        target platform that the tests will be running on (qemu or
 	                           kvmtool, default is qemu) (arm/arm64 only)
@@ -321,11 +322,15 @@ elif [ "$arch" = "ppc64" ]; then
 elif [ "$arch" = "riscv32" ] || [ "$arch" = "riscv64" ]; then
+elif [ "$arch" = "s390x" ]; then
+    testdir=s390x
-    testdir=$arch
+    echo "arch $arch is not supported!"
+    arch=
+    usage
 if [ ! -d "$srcdir/$testdir" ]; then
-    echo "$testdir does not exist!"
+    echo "$srcdir/$testdir does not exist!"
     exit 1

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