On 2026-08-03 13:54, Jakub Jelinek wrote:
On Mon, Aug 03, 2026 at 01:50:18PM +0200, Torbjorn SVENSSON wrote:
This change introduces new failures for arm-none-eabi using
thumb/arch=armv6s-m/cpu=cortex-m0/float-abi=soft/fpu=auto.
Testing torture/bitint-100.c, -O0
doing compile
Executing on host: /build/install-native/bin/arm-none-eabi-gcc
/build/gcc_src/gcc/testsuite/gcc.dg/torture/bitint-100.c -mthumb -march=armv6s-m
-mcpu=cortex-m0 -mfloat-abi=soft -mfpu=auto -dumpbase ""
-fdiagnostics-plain-output -O0 -std=c23 -pedantic-errors --specs=rdimon.specs
-Wl,--start-group -lc -lm -Wl,--end-group --specs=nosys.specs
-Wl,--allow-multiple-definition -Wl,-u,_isatty,-u,_fstat -Wl,-wrap,exit -Wl,-wrap,_exit
-Wl,-wrap,main -Wl,-wrap,abort -Wl,gcc_tg.o -lm -T qemu.ld -o ./bitint-100.exe
(timeout = 800)
spawn -ignore SIGHUP /build/install-native/bin/arm-none-eabi-gcc
/build/gcc_src/gcc/testsuite/gcc.dg/torture/bitint-100.c -mthumb
-march=armv6s-m -mcpu=cortex-m0 -mfloat-abi=soft -mfpu=auto -dumpbase
-fdiagnostics-plain-output -O0 -std=c23 -pedantic-errors --specs=rdimon.specs
-Wl,--start-group -lc -lm -Wl,--end-group --specs=nosys.specs
-Wl,--allow-multiple-definition -Wl,-u,_isatty,-u,_fstat -Wl,-wrap,exit
-Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -Wl,gcc_tg.o -lm -T qemu.ld -o
./bitint-100.exe
pid is 1478576 -1478576
/build/install-native/arm-none-eabi/bin/ld: /tmp/ccgSaSgH.o: in function `f1':
bitint-100.c:(.text+0x5a): undefined reference to `__atomic_compare_exchange_4'
/build/install-native/arm-none-eabi/bin/ld: (__atomic_compare_exchange_4):
Unknown destination type (ARM/Thumb) in /tmp/ccgSaSgH.o
bitint-100.c:(.text+0x5a): dangerous relocation: unsupported relocation
/build/install-native/arm-none-eabi/bin/ld: /tmp/ccgSaSgH.o: in function `f2':
bitint-100.c:(.text+0xa4): undefined reference to `__atomic_compare_exchange_4'
/build/install-native/arm-none-eabi/bin/ld: (__atomic_compare_exchange_4):
Unknown destination type (ARM/Thumb) in /tmp/ccgSaSgH.o
bitint-100.c:(.text+0xa4): dangerous relocation: unsupported relocation
...
collect2: error: ld returned 1 exit status
status 1
compiler exited with status 1
FAIL: gcc.dg/torture/bitint-100.c -O0 (test for excess errors)
Same failure exist on both trunk and releases/gcc-16.
I thought gcc has been changed to add -latomic_asneeded by default.
Or is this because the linker doesn't support it in this configuration?
To my knowledge, there is no atomic support for armv6s-m, but I can be wrong.
Kind regards,
Torbjörn
