[PATCH] ltp: Work around parallel make race

[Richard Purdie <richard.purdie@linuxfoundation.org>]

As per the comments, the makefiles use make -C extensively and
this causes particular problems around the kernel syscall header. We
therefore ensure its up to date in advance.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/meta/recipes-extended/ltp/ltp_20140115.bb b/meta/recipes-extended/ltp/ltp_20140115.bb
index 361eccb..b04debf 100644
--- a/meta/recipes-extended/ltp/ltp_20140115.bb
+++ b/meta/recipes-extended/ltp/ltp_20140115.bb
@@ -43,6 +43,14 @@ do_configure_prepend() {
     (cd utils/ffsb-6.0-rc2; autoreconf -fvi; ./configure ${CONFIGUREOPTS})
 }
 
+# The makefiles make excessive use of make -C and several include testcases.mk
+# which triggers a build of the syscall header. To reproduce, build ltp,
+# then delete the header, then "make -j XX" and watch regen.sh run multiple 
+# times. Its easier to generate this once here instead.
+do_compile_prepend () {
+	( cd ${S} make -C testcases/kernel include/linux_syscall_numbers.h )
+}
+
 do_install(){
     install -d ${D}/opt/ltp/
     oe_runmake DESTDIR=${D} SKIP_IDCHECK=1 install