[PATCH 4/5] selftests/nolibc: support out-of-tree builds

Thomas Weißschuh
2023-10-10T12:34:30Z

Out of tree builds are much more convenient when building for multiple
architectures or configurations in parallel.

Only absolute O= parameters are supported as Makefile.include will
always resolve relative paths in relation to $(srctree) instead of the
current directory.

Add a call to "make outputmakefile" to verify that the sourcetree is
clean.

This is based on Zhangjins out-of-tree patch.
It extends that work for get_init_cpio support and also drops relative
O= specifications explicitly.

Link: https://lore.kernel.org/lkml/06d96bd81fe812a9718098a383678ad3beba98b1.1691215074.git.falcon@tinylab.org/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
tools/testing/selftests/nolibc/Makefile | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 598d53c5cb7b..21e3f7da2ecf 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -1,9 +1,16 @@
# SPDX-License-Identifier: GPL-2.0
# Makefile for nolibc tests
include ../../../scripts/Makefile.include
+include ../../../scripts/utilities.mak
# We need this for the "cc-option" macro.
include ../../../build/Build.include

+ifneq ($(O),)
+ifneq ($(call is-absolute,$(O)),y)
+$(error Only absolute O= parameters are supported)
+endif
+endif
+
# we're in ".../tools/testing/selftests/nolibc"
ifeq ($(srctree),)
srctree := $(patsubst %/tools/testing/selftests/,%,$(dir $(CURDIR)))
@@ -14,6 +21,8 @@ include $(srctree)/scripts/subarch.include
ARCH = $(SUBARCH)
endif

+objtree ?= $(srctree)
+
# XARCH extends the kernel's ARCH with a few variants of the same
# architecture that only differ by the configuration, the toolchain
# and the Qemu program used. It is copied as-is into ARCH except for
@@ -52,7 +61,7 @@ IMAGE_ppc64le = arch/powerpc/boot/zImage
IMAGE_riscv = arch/riscv/boot/Image
IMAGE_s390 = arch/s390/boot/bzImage
IMAGE_loongarch = arch/loongarch/boot/vmlinuz.efi
-IMAGE = $(IMAGE_$(XARCH))
+IMAGE = $(objtree)/$(IMAGE_$(XARCH))
IMAGE_NAME = $(notdir $(IMAGE))

# default kernel configurations that appear to be usable
@@ -167,6 +176,7 @@ sysroot: sysroot/$(ARCH)/include
sysroot/$(ARCH)/include:
$(Q)rm -rf sysroot/$(ARCH) sysroot/sysroot
$(QUIET_MKDIR)mkdir -p sysroot
+ $(Q)$(MAKE) -C $(srctree) outputmakefile
$(Q)$(MAKE) -C $(srctree)/tools/include/nolibc ARCH=$(ARCH) OUTPUT=$(CURDIR)/sysroot/ headers_standalone
$(Q)mv sysroot/sysroot sysroot/$(ARCH)

@@ -199,7 +209,7 @@ run-user: nolibc-test
$(Q)$(REPORT) $(CURDIR)/run.out

initramfs.cpio: kernel nolibc-test
- $(QUIET_GEN)echo 'file /init nolibc-test 755 0 0' | $(srctree)/usr/gen_init_cpio - > initramfs.cpio
+ $(QUIET_GEN)echo 'file /init nolibc-test 755 0 0' | $(objtree)/usr/gen_init_cpio - > initramfs.cpio

initramfs: nolibc-test
$(QUIET_MKDIR)mkdir -p initramfs
@@ -217,12 +227,12 @@ kernel-standalone: initramfs

# run the tests after building the kernel
run: kernel initramfs.cpio
- $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -initrd initramfs.cpio -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
+ $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(IMAGE)" -initrd initramfs.cpio -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
$(Q)$(REPORT) $(CURDIR)/run.out

# re-run the tests from an existing kernel
rerun:
- $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -initrd initramfs.cpio -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
+ $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(IMAGE)" -initrd initramfs.cpio -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
$(Q)$(REPORT) $(CURDIR)/run.out

# report with existing test log

--
2.42.0