From: Andreas Bießmann biessmann@corscience.de
U-boot itself generally builds with -nostdinc. This is because the bootloader needs to be completely standalone. In the sandbox arch though, we need a little bit of code to glue the u-boot world to the host operating system, and we need to be able to access the host libc's headers in order to do so.
Currently, we're using -I/usr/include to workaround the global -nostdinc, but that doesn't work for everyone and for all headers. Instead, let's filter out -nostdinc when building the os.c code.
Without this patch, some distros hit errors such as: ---8<--- In file included from /usr/include/fcntl.h:27:0, from os.c:22: /usr/include/features.h:323:26: fatal error: bits/predefs.h: No such file or directory --->8---
Signed-off-by: Andreas Bießmann biessmann@corscience.de Signed-off-by: Mike Frysinger vapier@gentoo.org --- v2 - merge my local changelog with Andreas'
arch/sandbox/cpu/Makefile | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/sandbox/cpu/Makefile b/arch/sandbox/cpu/Makefile index e5e860b..2ae0f71 100644 --- a/arch/sandbox/cpu/Makefile +++ b/arch/sandbox/cpu/Makefile @@ -23,9 +23,6 @@ # MA 02111-1307 USA #
-# os.c is build in the system environment, so needs standard includes -CPPFLAGS_arch/sandbox/cpu/os.o += -I/usr/include - include $(TOPDIR)/config.mk
LIB = $(obj)lib$(CPU).o @@ -40,6 +37,10 @@ all: $(obj).depend $(LIB) $(LIB): $(OBJS) $(call cmd_link_o_target, $(OBJS))
+# os.c is build in the system environment, so needs standard includes +$(obj)os.o: ALL_CFLAGS := $(filter-out -nostdinc,$(ALL_CFLAGS)) +$(obj).depend.os: CPPFLAGS := $(filter-out -nostdinc,$(CPPFLAGS)) + #########################################################################
# defines $(obj).depend target