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build sytem: add --no-warn-rwx-segments to linker

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Before we disabled the warning about RWX segments only for picolibc,
but this issue is popping up on more and more toolchains (looking
at MSP430 and RISC-V). Other than on `native`/`native64`, there is no
MMU to enforce whatever permissions the segments contain anyway.
(And writing to ROM with regular store instructions will not be possible
even without the need for an MMU.)

So let's just globally disable this warning, unless building for
`native` and `native64`.
This commit is contained in:
Marian Buschsieweke 2024-02-12 20:55:58 +01:00
parent f68f977274
commit c9f16f1194
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GPG Key ID: 77AA882EC78084E6
2 changed files with 9 additions and 8 deletions
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9
Makefile.include
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@ -506,6 +506,15 @@ TOOLCHAINS_SUPPORTED ?= gnu
# Import all toolchain settings
include $(RIOTMAKE)/toolchain/$(TOOLCHAIN).inc.mk
# Other than on native, RWX segments in ROM are not actually RWX, as regular
# store instructions won't write to flash.
ifeq (,$(filter native native64,$(BOARD)))
LINKER_SUPPORTS_NOWARNRWX ?= $(shell LC_ALL=C $(LINK) $(RIOTTOOLS)/testprogs/minimal_linkable.c -o /dev/null -lc -Wall -Wextra -pedantic -Wl,--no-warn-rwx-segments 2> /dev/null && echo 1 || echo 0)
ifeq (1,$(LINKER_SUPPORTS_NOWARNRWX))
LINKFLAGS += -Wl,--no-warn-rwx-segments
endif
endif
# Append ldscript path after importing CPU and board makefiles to allow
# overriding the core ldscripts
LINKFLAGS += -L$(RIOTBASE)/core/ldscripts

8
makefiles/libc/picolibc.mk
View File

@ -27,14 +27,6 @@ ifeq (1,$(USE_PICOLIBC))
CFLAGS += -DPICOLIBC_INTEGER_PRINTF_SCANF
LINKFLAGS += -DPICOLIBC_INTEGER_PRINTF_SCANF
endif
# For some reason segments with RWX permissions will be created with
# picolibc. But since (as of now) RIOT only supports disabling the execute of
# all RAM via the `mpu_noexec_ram` module, permissions of the segments are
# ignored anyway. So for now, we just simply disable the warning.
LINKER_SUPPORTS_NOWARNRWX ?= $(shell LC_ALL=C $(LINK) $(RIOTTOOLS)/testprogs/minimal_linkable.c -o /dev/null -lc -Wall -Wextra -pedantic -Wl,--no-warn-rwx-segments 2> /dev/null && echo 1 || echo 0)
ifeq (1,$(LINKER_SUPPORTS_NOWARNRWX))
LINKFLAGS += -Wl,--no-warn-rwx-segments
endif
endif
LINKFLAGS += -lc