Currently the gpio selftests fail to build if the source tree is read only: make -j 160 -C tools/testing/selftests TARGETS=gpio make[1]: Entering directory '/linux/tools/testing/selftests/gpio' make OUTPUT=/linux/tools/gpio/ -C /linux/tools/gpio make[2]: Entering directory '/linux/tools/gpio' mkdir -p /linux/tools/gpio/include/linux 2>&1 || true ln -sf /linux/tools/gpio/../../include/uapi/linux/gpio.h /linux/tools/gpio/include/linux/gpio.h ln: failed to create symbolic link '/linux/tools/gpio/include/linux/gpio.h': Read-only file system This happens because we ask make to build ../../../gpio (tools/gpio) without pointing OUTPUT away from the source directory. To fix it we create a subdirectory of the existing OUTPUT directory, called tools-gpio, and tell tools/gpio to build in there. Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> --- tools/testing/selftests/gpio/Makefile | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile index 615c8a953ade..acf4088a9891 100644 --- a/tools/testing/selftests/gpio/Makefile +++ b/tools/testing/selftests/gpio/Makefile @@ -17,14 +17,18 @@ KSFT_KHDR_INSTALL := 1 include ../lib.mk GPIODIR := $(realpath ../../../gpio) -GPIOOBJ := gpio-utils.o +GPIOOUT := $(OUTPUT)/tools-gpio/ +GPIOOBJ := $(GPIOOUT)/gpio-utils.o override define CLEAN $(RM) $(TEST_GEN_PROGS_EXTENDED) - $(MAKE) -C $(GPIODIR) OUTPUT=$(GPIODIR)/ clean + $(RM) -rf $(GPIOOUT) endef -$(TEST_GEN_PROGS_EXTENDED): $(GPIODIR)/$(GPIOOBJ) +$(TEST_GEN_PROGS_EXTENDED): $(GPIOOBJ) -$(GPIODIR)/$(GPIOOBJ): - $(MAKE) OUTPUT=$(GPIODIR)/ -C $(GPIODIR) +$(GPIOOUT): + mkdir -p $@ + +$(GPIOOBJ): $(GPIOOUT) + $(MAKE) OUTPUT=$(GPIOOUT) -C $(GPIODIR) -- 2.25.1
