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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
