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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 $(LINK) -xc - -o /dev/null -lc -Wall -Wextra -pedantic <FLAGS_TO_TEST>
to check for flags supported by the compiler (used as linker frontend).
This however no longer works with newlib 4.3.0, which requires the
symbols `_sbrk_r`, `_close_r`, `_lseek_r`, `_read_r`, and `_write_r` to
be present. Instead, now a new file `minimal_linkable.c` was added that
adds all the missing symbols and is used in the linker feature tests
instead.
41 lines
1.8 KiB
Makefile
41 lines
1.8 KiB
Makefile
ifneq (,$(filter picolibc,$(USEMODULE)))
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# Test if picolibc.specs is available
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ifeq ($(shell $(LINK) -specs=picolibc.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
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USE_PICOLIBC = 1
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ifeq (LC_ALL=C $(LINK) $(RIOTTOOLS)/testprogs/minimal_linkable.c -o /dev/null -lc -specs=picolibc.specs -Wall -Wextra -pedantic 2>&1 | grep -q "use of wchar_t values across objects may fail" ; echo $$?),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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else
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BUILDDEPS += _missing-picolibc
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endif
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endif
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.PHONY: _missing-picolibc
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_missing-picolibc:
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@$(Q)echo "picolibc was selected to be build but no picolibc.specs could be found"
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@$(Q)echo "you might want to install "picolibc" for "$(TARGET_ARCH)""
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@$(Q)echo "or add "FEATURES_BLACKLIST += picolibc" to Makefile)"
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@$(COLOR_ECHO) "$(COLOR_RED)check your installation or build configuration.$(COLOR_RESET)"
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@$(Q)exit 1
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ifeq (1,$(USE_PICOLIBC))
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LINKFLAGS += -specs=picolibc.specs
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CFLAGS += -specs=picolibc.specs
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ifeq (,$(filter printf_float scanf_float,$(USEMODULE)))
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CFLAGS += -DPICOLIBC_INTEGER_PRINTF_SCANF
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LINKFLAGS += -DPICOLIBC_INTEGER_PRINTF_SCANF
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endif
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# For some reason segments with RWX permissions will be created with
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# picolibc. But since (as of now) RIOT only supports disabling the execute of
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# all RAM via the `mpu_noexec_ram` module, permissions of the segments are
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# ignored anyway. So for now, we just simply disable the warning.
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LINKER_SUPPORTS_NOWARNRWX ?= $(shell LC_ALL=C $(LINK) $(RIOTTOOLS)/testprogs/minimal_linkable.c -o /dev/null -lc -Wall -Wextra -pedantic -Wl,--no-warn-rwx-segments 2> /dev/null && echo 1 || echo 0)
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ifeq (1,$(LINKER_SUPPORTS_NOWARNRWX))
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LINKFLAGS += -Wl,--no-warn-rwx-segments
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endif
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endif
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LINKFLAGS += -lc
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