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41 lines
2.0 KiB
Makefile
41 lines
2.0 KiB
Makefile
UNDEF := $(BINDIR)newlib_syscalls_default/syscalls.o $(UNDEF)
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# Search for Newlib include directories
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# Since Clang is not installed as a separate instance for each crossdev target
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# we need to tell it where to look for platform specific includes (Newlib
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# headers instead of Linux/Glibc headers.)
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# On GCC this is done when building the cross compiler toolchain so we do not
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# actually need to specify the include paths for system includes.
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# Ubuntu gcc-arm-embedded toolchain (https://launchpad.net/gcc-arm-embedded)
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# places newlib headers in several places, but the primary source seem to be
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# /etc/alternatives/gcc-arm-none-eabi-include
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# Gentoo Linux crossdev place the newlib headers in /usr/arm-none-eabi/include
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# Arch Linux also place the newlib headers in /usr/arm-none-eabi/include
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# Ubuntu seem to put a copy of the newlib headers in the same place as
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# Gentoo crossdev, but we prefer to look at /etc/alternatives first.
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# On OSX, newlib includes are possibly located in
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# /usr/local/opt/arm-none-eabi*/arm-none-eabi/include
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NEWLIB_INCLUDE_PATTERNS ?= \
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/etc/alternatives/gcc-$(TARGET_TRIPLE)-include \
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/usr/$(TARGET_TRIPLE)/include \
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/usr/local/opt/$(TARGET_TRIPLE)*/$(TARGET_TRIPLE)/include \
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#
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# Use the wildcard Makefile function to search for existing directories matching
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# the patterns above. We use the -isystem gcc/clang argument to add the include
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# directories as system include directories, which means they will not be
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# searched until after all the project specific include directories (-I/path)
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NEWLIB_INCLUDES ?= \
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$(foreach dir, \
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$(foreach pat, $(NEWLIB_INCLUDE_PATTERNS), $(wildcard $(pat))), \
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-isystem $(dir))
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# If nothing was found we will try to fall back to searching for a cross-gcc in
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# the current PATH and use a relative path for the includes
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ifeq (,$(NEWLIB_INCLUDES))
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NEWLIB_INCLUDES := $(addprefix -isystem ,$(wildcard $(dir $(shell which $(PREFIX)gcc))../$(TARGET_TRIPLE)/include))
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endif
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# Newlib includes should go before GCC includes.
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export INCLUDES := $(NEWLIB_INCLUDES) $(INCLUDES)
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