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The following commit(s) were added to refs/heads/master by this push: new 51a82d52890 arm/clang: Fix crash caused by clang compiling with -mfpu=fpv5-d16 and -march=armv8.1-m.main+mve.fp+fp.dp 51a82d52890 is described below commit 51a82d52890e5484d663f76b1ef52f99ac2c56e9 Author: wangmingrong1 <wangmingro...@xiaomi.com> AuthorDate: Thu Jul 10 12:31:58 2025 +0800 arm/clang: Fix crash caused by clang compiling with -mfpu=fpv5-d16 and -march=armv8.1-m.main+mve.fp+fp.dp The above combination of compilation causes the compiler to crash: #1 0x0000000001fbe154 llvm::sys::CleanupOnSignal(unsigned long) (clang18/bin/clang-19+0x1fbe154) #2 0x0000000001f21203 llvm::CrashRecoveryContext::HandleExit(int) (clang18/bin/clang-19+0x1f21203) #3 0x0000000001fb7b7e llvm::sys::Process::Exit(int, bool) (clang18/bin/clang-19+0x1fb7b7e) #4 0x0000000000b25f0d (clang18/bin/clang-19+0xb25f0d) ................................................................................ ................................................................................ This problem occurs in clang18 and above, and there are compilation instructions that are incompatible with GCC. By following the recommended v8.1m corresponding fpu modification, no crash will occur ➜ NX git:(master) ✗ clang --target=arm-none-eabi -mfpu=help clang: note: available multilibs are: --target=thumbv8m.main-unknown-none-eabi -mfpu=none --target=thumbv8m.main-unknown-none-eabi -mfpu=none -fno-exceptions -fno-rtti --target=thumbv8m.main-unknown-none-eabihf -mfpu=fpv5-sp-d16 --target=thumbv8m.main-unknown-none-eabihf -mfpu=fpv5-sp-d16 -fno-exceptions -fno-rtti --target=thumbv8.1m.main-unknown-none-eabi -mfpu=none --target=thumbv8.1m.main-unknown-none-eabi -mfpu=none -fno-exceptions -fno-rtti --target=thumbv8.1m.main-unknown-none-eabihf -march=thumbv8.1m.main+fp16 -mfpu=fp-armv8-fullfp16-sp-d16 --target=thumbv8.1m.main-unknown-none-eabihf -march=thumbv8.1m.main+fp16 -mfpu=fp-armv8-fullfp16-sp-d16 -fno-exceptions -fno-rtti --target=thumbv8.1m.main-unknown-none-eabihf -march=thumbv8.1m.main+fp16 -mfpu=fp-armv8-fullfp16-d16 --target=thumbv8.1m.main-unknown-none-eabihf -march=thumbv8.1m.main+fp16 -mfpu=fp-armv8-fullfp16-d16 -fno-exceptions -fno-rtti --target=thumbv8.1m.main-unknown-none-eabihf -march=thumbv8.1m.main+mve -mfpu=none --target=thumbv8.1m.main-unknown-none-eabihf -march=thumbv8.1m.main+mve -mfpu=none -fno-exceptions -fno-rtti Signed-off-by: wangmingrong1 <wangmingro...@xiaomi.com> --- arch/arm/src/armv8-m/Toolchain.defs | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/arm/src/armv8-m/Toolchain.defs b/arch/arm/src/armv8-m/Toolchain.defs index 2c37f6d3612..59397646c7a 100644 --- a/arch/arm/src/armv8-m/Toolchain.defs +++ b/arch/arm/src/armv8-m/Toolchain.defs @@ -81,14 +81,22 @@ else ifeq ($(CONFIG_ARCH_CORTEXM55),y) TOOLCHAIN_MARCH := -march=armv8.1-m.main$(EXTCPUFLAGS) LLVM_CPUTYPE := cortex-m55 ifeq ($(CONFIG_ARCH_FPU),y) - TOOLCHAIN_MFLOAT := -mfpu=fpv5-d16 + ifeq ($(CONFIG_ARCH_TOOLCHAIN_GCC),y) + TOOLCHAIN_MFLOAT := -mfpu=fpv5-d16 + else ifeq ($(CONFIG_ARCH_TOOLCHAIN_CLANG),y) + TOOLCHAIN_MFLOAT := -mfpu=fp-armv8-fullfp16-d16 + endif endif else ifeq ($(CONFIG_ARCH_CORTEXM85),y) TOOLCHAIN_MTUNE := -mtune=cortex-m85 TOOLCHAIN_MARCH := -march=armv8.1-m.main$(EXTCPUFLAGS) LLVM_CPUTYPE := cortex-m85 ifeq ($(CONFIG_ARCH_FPU),y) - TOOLCHAIN_MFLOAT := -mfpu=fpv5-d16 + ifeq ($(CONFIG_ARCH_TOOLCHAIN_GCC),y) + TOOLCHAIN_MFLOAT := -mfpu=fpv5-d16 + else ifeq ($(CONFIG_ARCH_TOOLCHAIN_CLANG),y) + TOOLCHAIN_MFLOAT := -mfpu=fp-armv8-fullfp16-d16 + endif endif endif