tools build: Add test for missing include

The current build framework fails to cope with header file removal. The
reason is that the removed header file stays in the .cmd file target
rule and forces the build to fail.

This issue is fixed and explained in the following patches.

Adding a new build test that simulates header removal.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1443004442-32660-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 12 insertions, 1 deletions

diff --git a/tools/build/tests/ex/Build b/tools/build/tests/ex/Build
index 429c7d452101..4d502f9b1a50 100644
--- a/tools/build/tests/ex/Build
+++ b/tools/build/tests/ex/Build
@@ -4,6 +4,7 @@ ex-y += b.o
 ex-y += b.o
 ex-y += empty/
 ex-y += empty2/
+ex-y += inc.o
 
 libex-y += c.o
 libex-y += d.o
diff --git a/tools/build/tests/ex/Makefile b/tools/build/tests/ex/Makefile
index a8f596e37fd2..f279b84cb859 100644
--- a/tools/build/tests/ex/Makefile
+++ b/tools/build/tests/ex/Makefile
@@ -1,4 +1,4 @@
-export srctree := ../../../..
+export srctree := $(abspath ../../../..)
 export CC      := gcc
 export LD      := ld
 export AR      := ar
diff --git a/tools/build/tests/ex/ex.c b/tools/build/tests/ex/ex.c
index dc42eb2e1a67..57de6074d252 100644
--- a/tools/build/tests/ex/ex.c
+++ b/tools/build/tests/ex/ex.c
@@ -5,6 +5,7 @@ int c(void);
 int d(void);
 int e(void);
 int f(void);
+int inc(void);
 
 int main(void)
 {
@@ -14,6 +15,7 @@ int main(void)
 	d();
 	e();
 	f();
+	inc();
 
 	return 0;
 }
diff --git a/tools/build/tests/ex/inc.c b/tools/build/tests/ex/inc.c
new file mode 100644
index 000000000000..c20f1e9033a3
--- /dev/null
+++ b/tools/build/tests/ex/inc.c
@@ -0,0 +1,8 @@
+#ifdef INCLUDE
+#include "krava.h"
+#endif
+
+int inc(void)
+{
+	return 0;
+}