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2b2506c052
Before the build system used something like
echo "int main(){} void _exit(int n) {(void)n;while(1);}" | LC_ALL=C $(LINK) -xc - -o /dev/null -lc -Wall -Wextra -pedantic <FLAGS_TO_TEST>
to check for flags supported by the compiler (used as linker frontend).
This however no longer works with newlib 4.3.0, which requires the
symbols `_sbrk_r`, `_close_r`, `_lseek_r`, `_read_r`, and `_write_r` to
be present. Instead, now a new file `minimal_linkable.c` was added that
adds all the missing symbols and is used in the linker feature tests
instead.
103 lines
4.9 KiB
Makefile
103 lines
4.9 KiB
Makefile
ifneq (,$(filter newlib_nano,$(USEMODULE)))
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# Test if nano.specs is available
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ifeq ($(shell $(LINK) -specs=nano.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
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USE_NEWLIB_NANO = 1
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ifeq ($(shell LC_ALL=C $(LINK) $(RIOTTOOLS)/testprogs/minimal_linkable.c -o /dev/null -lc -specs=nano.specs -Wall -Wextra -pedantic 2>&1 | grep -q "use of wchar_t values across objects may fail" ; echo $$?),0)
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CFLAGS += -fshort-wchar
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LINKFLAGS += -Wl,--no-wchar-size-warning
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endif
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endif
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endif
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ifneq (,$(filter newlib_gnu_source,$(USEMODULE)))
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CFLAGS += -D_GNU_SOURCE=1
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endif
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ifeq (1,$(USE_NEWLIB_NANO))
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LINKFLAGS += -specs=nano.specs
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endif
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LINKFLAGS += -lc
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# Note on `realpath` vs `abspath`
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#
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# `realpath` is used instead of `abspath` to support Mingw32
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# It fixes issues when using windows formatted paths like in the gcc output
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# It does leave the trailing `/` on windows though
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# Search for Newlib include directories
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# Try to search for newlib in the standard search path of the compiler for includes
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ifeq (,$(NEWLIB_INCLUDE_DIR))
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COMPILER_INCLUDE_PATHS := $(shell $(PREFIX)gcc -v -x c -E /dev/null 2>&1 | \
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sed \
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-e '1,/\#include <...> search starts here:/d' \
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-e '/End of search list./,$$d' \
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-e 's/^ *//')
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NEWLIB_INCLUDE_DIR := $(firstword $(realpath $(dir $(wildcard $(addsuffix /newlib.h, $(COMPILER_INCLUDE_PATHS))))))
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endif
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ifeq (,$(NEWLIB_INCLUDE_DIR))
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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 or /usr/local/opt/gcc-arm/arm-none-eabi/include
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NEWLIB_INCLUDE_PATTERNS ?= \
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/etc/alternatives/gcc-$(TARGET_ARCH)-include \
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/usr/$(TARGET_ARCH)/include \
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/usr/local/opt/$(TARGET_ARCH)*/$(TARGET_ARCH)/include \
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/usr/local/opt/gcc-*/$(TARGET_ARCH)/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_INCLUDE_DIR := $(firstword $(realpath $(dir $(wildcard $(addsuffix /newlib.h, $(NEWLIB_INCLUDE_PATTERNS))))))
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endif
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# If nothing was found we will try to fall back to searching for a cross-gcc in
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# the current PATH and use a relative path for the includes
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ifeq (,$(NEWLIB_INCLUDE_DIR))
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NEWLIB_INCLUDE_DIR := $(realpath $(wildcard $(dir $(shell command -v $(PREFIX)gcc 2>/dev/null))/../$(TARGET_ARCH)/include))
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endif
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ifeq ($(TOOLCHAIN),llvm)
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# A cross GCC already knows the target libc include path (build-in at compile time)
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# but Clang, when cross-compiling, needs to be told where to find the headers
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# for the system being built.
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# We also add -nostdinc to avoid including the host system headers by mistake
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# in case some header is missing from the cross tool chain
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NEWLIB_INCLUDES := -isystem $(NEWLIB_INCLUDE_DIR) -nostdinc
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NEWLIB_INCLUDES += $(addprefix -isystem ,$(realpath $(wildcard $(dir $(NEWLIB_INCLUDE_DIR))/usr/include)))
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# Newlib includes should go before GCC includes. This is especially important
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# when using Clang, because Clang will yield compilation errors on some GCC-
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# bundled headers. Clang compatible versions of those headers are already
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# provided by Newlib, so placing this directory first will eliminate those problems.
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# The above problem was observed with LLVM 3.9.1 when building against GCC 6.3.0 headers.
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INCLUDES := $(NEWLIB_INCLUDES) $(INCLUDES)
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endif
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ifeq (1,$(USE_NEWLIB_NANO))
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NEWLIB_NANO_INCLUDE_DIR ?= $(firstword $(wildcard $(NEWLIB_INCLUDE_DIR)/newlib-nano \
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$(NEWLIB_INCLUDE_DIR)/newlib/nano \
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$(NEWLIB_INCLUDE_DIR)/nano))
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ifneq (,$(NEWLIB_NANO_INCLUDE_DIR))
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# newlib-nano overrides newlib.h and its include dir should therefore go before
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# the regular system include dirs.
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INCLUDES := -isystem $(NEWLIB_NANO_INCLUDE_DIR) $(INCLUDES)
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endif
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endif
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