[LTP] [PATCH v2] configure: Check for KVM linker script support

[Martin Doucha]

Some toolchains don't fully support the KVM linker scripts. Disable KVM tests
if linker check fails in configure script.

Signed-off-by: Martin Doucha <mdoucha@suse.cz>
---

Changes since v1:
- Set empty CFLAGS to avoid linking failure with -m32

 configure.ac              | 17 +++++++++++++++++
 include/mk/features.mk.in |  3 +++
 testcases/kernel/Makefile |  5 ++++-
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 816ebf820..69b145b5f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -397,6 +397,23 @@ LTP_CHECK_TASKSTATS
 test "x$with_tirpc" = xyes && LTP_CHECK_TIRPC
 LTP_DETECT_HOST_CPU
 
+AC_MSG_CHECKING([whether linker can handle KVM payloads])
+ltp_backup_ldflags="$LDFLAGS"
+ltp_backup_flags="$[]_AC_LANG_PREFIX[]FLAGS"
+LDFLAGS="-T ${srcdir}/testcases/kernel/kvm/linker/${HOST_CPU}.lds"
+_AC_LANG_PREFIX[]FLAGS=
+AC_LINK_IFELSE([AC_LANG_PROGRAM()],
+  [
+    AC_MSG_RESULT([yes])
+    AC_SUBST([WITH_KVM_TESTSUITE],["yes"])
+  ],
+  [
+    AC_MSG_RESULT([no])
+    AC_SUBST([WITH_KVM_TESTSUITE],["no"])
+  ])
+_AC_LANG_PREFIX[]FLAGS="$ltp_backup_flags"
+LDFLAGS="$ltp_backup_ldflags"
+
 AC_OUTPUT
 
 cat << EOF
diff --git a/include/mk/features.mk.in b/include/mk/features.mk.in
index ecb15a0f7..802ee0ba8 100644
--- a/include/mk/features.mk.in
+++ b/include/mk/features.mk.in
@@ -52,3 +52,6 @@ WITH_REALTIME_TESTSUITE		:= no
 else
 WITH_REALTIME_TESTSUITE		:= @WITH_REALTIME_TESTSUITE@
 endif
+
+# Enable testcases/kernel/kvm compile and install?
+WITH_KVM_TESTSUITE		:= @WITH_KVM_TESTSUITE@
diff --git a/testcases/kernel/Makefile b/testcases/kernel/Makefile
index c0fa24147..bf890e175 100644
--- a/testcases/kernel/Makefile
+++ b/testcases/kernel/Makefile
@@ -29,7 +29,6 @@ SUBDIRS			+= connectors \
 			   io \
 			   ipc \
 			   irq \
-			   kvm \
 			   logging \
 			   mem \
 			   numa \
@@ -45,6 +44,10 @@ ifeq ($(WITH_POWER_MANAGEMENT_TESTSUITE),yes)
 SUBDIRS			+= power_management
 endif
 
+ifeq ($(WITH_KVM_TESTSUITE),yes)
+SUBDIRS			+= kvm
+endif
+
 endif
 
 ifeq ($(ANDROID),1)
-- 
2.36.1