From e570d7c15a73f88942885881a84257a65fa44c80 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Tue, 12 Feb 2013 15:03:37 -0700 Subject: [PATCH] kbuild: limit dtc+cpp include path Device tree source files may now include header files. The intent is that those header files define/name constants used as part of the DT bindings. Currently this feature is open to abuse, since any kernel header file at all can be included, This could allow device tree files to become dependant on kernel headers files, and thus make them no longer OS-independent. This would also prevent separating the device tree source files from the kernel repository. Solve this by limiting the cpp include path for device tree files to separate directories. Signed-off-by: Stephen Warren Signed-off-by: Grant Likely --- scripts/Makefile.lib | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 7910229ec665..07125e697d7a 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -156,6 +156,11 @@ cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ ld_flags = $(LDFLAGS) $(ldflags-y) +dtc_cpp_flags = -Wp,-MD,$(depfile) -nostdinc \ + -I$(srctree)/arch/$(SRCARCH)/boot/dts \ + -I$(srctree)/arch/$(SRCARCH)/include/dts \ + -undef -D__DTS__ + # Finds the multi-part object the current object will be linked into modname-multi = $(sort $(foreach m,$(multi-used),\ $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) @@ -272,8 +277,7 @@ $(obj)/%.dtb: $(src)/%.dts FORCE dtc-tmp = $(subst $(comma),_,$(dot-target).dts) quiet_cmd_dtc_cpp = DTC+CPP $@ -cmd_dtc_cpp = $(CPP) $(cpp_flags) -x assembler-with-cpp -undef -D__DTS__ \ - -o $(dtc-tmp) $< ; \ +cmd_dtc_cpp = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $(dtc-tmp) $(obj)/%.dtb: $(src)/%.dtsp FORCE