[PATCH v3 11/11] selftests: error out if kernel header files are not yet built

[John Hubbard <jhubbard@nvidia.com>]

As per a discussion with Muhammad Usama Anjum [1], the following is how
one is supposed to build selftests:

    make headers && make -C tools/testing/selftests/mm

Change the selftest build system's lib.mk to fail out with a helpful
message if that prerequisite "make headers" has not been done yet.

[1] https://lore.kernel.org/all/bf910fa5-0c96-3707-cce4-5bcc656b6274@collabora.com/

Cc: David Hildenbrand <david@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 tools/testing/selftests/lib.mk | 36 +++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 05400462c779..b8ea03b9a015 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -44,10 +44,22 @@ endif
 selfdir = $(realpath $(dir $(filter %/lib.mk,$(MAKEFILE_LIST))))
 top_srcdir = $(selfdir)/../../..
 
-ifeq ($(KHDR_INCLUDES),)
-KHDR_INCLUDES := -isystem $(top_srcdir)/usr/include
+ifneq ($(KBUILD_OUTPUT),)
+  # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
+  # expand a shell special character '~'. We use a somewhat tedious way here.
+  abs_objtree := $(shell cd $(top_srcdir) && mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
+  $(if $(abs_objtree),, \
+    $(error failed to create output directory "$(KBUILD_OUTPUT)"))
+  # $(realpath ...) resolves symlinks
+  abs_objtree := $(realpath $(abs_objtree))
+  KHDR_DIR := ${abs_objtree}/usr/include
+else
+  abs_srctree := $(shell cd $(top_srcdir) && pwd)
+  KHDR_DIR := ${abs_srctree}/usr/include
 endif
 
+KHDR_INCLUDES := -isystem $(KHDR_DIR)
+
 # The following are built by lib.mk common compile rules.
 # TEST_CUSTOM_PROGS should be used by tests that require
 # custom build rule and prevent common build rule use.
@@ -58,7 +70,25 @@ TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
 TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
 TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))
 
-all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES)
+all: kernel_header_files $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) \
+     $(TEST_GEN_FILES)
+
+kernel_header_files:
+	@ls $(KHDR_DIR)/linux/*.h >/dev/null 2>/dev/null;                      \
+	if [ $$? -ne 0 ]; then                                                 \
+            RED='\033[1;31m';                                                  \
+            NOCOLOR='\033[0m';                                                 \
+            echo;                                                              \
+            echo -e "$${RED}error$${NOCOLOR}: missing kernel header files.";   \
+            echo "Please run this and try again:";                             \
+            echo;                                                              \
+            echo "    cd $(top_srcdir)";                                       \
+            echo "    make headers";                                           \
+            echo;                                                              \
+	    exit 1; \
+	fi
+
+.PHONY: kernel_header_files
 
 define RUN_TESTS
 	BASE_DIR="$(selfdir)";			\
-- 
2.40.1