Incorrect target in .elf attributes #622
Description
Summary
When compiling for cortex-m23 it has different attributes in elf file.
To Reproduce
- Compile any binary for cortex-m23, I did it with these options:
--target=arm-none-eabi
-march=armv8-m.base
-mcpu=cortex-m23
-mthumb
-mfpu=none
-mfloat-abi=soft
- Check it with llvm-readelf or with arm-none-eabi-readelf. They give slightly different but the same output in fact.
$ llvm-readelf -A blinker.elf
BuildAttributes {
FormatVersion: 0x41
Section 1 {
SectionLength: 64
Vendor: aeabi
Tag: Tag_File (0x1)
Size: 54
FileAttributes {
Attribute {
Tag: 67
TagName: conformance
Value: 2.09
}
Attribute {
Tag: 5
TagName: CPU_name
Value: cortex-m0
}
Attribute {
Tag: 6
Value: 12
TagName: CPU_arch
Description: ARM v6S-M
}
Attribute {
Tag: 7
Value: 77
TagName: CPU_arch_profile
Description: Microcontroller
}
Attribute {
Tag: 8
Value: 0
TagName: ARM_ISA_use
Description: Not Permitted
}
Attribute {
Tag: 9
Value: 1
TagName: THUMB_ISA_use
Description: Thumb-1
}
Attribute {
Tag: 14
Value: 0
TagName: ABI_PCS_R9_use
Description: v6
}
Attribute {
Tag: 17
Value: 1
TagName: ABI_PCS_GOT_use
Description: Direct
}
Attribute {
Tag: 18
Value: 4
TagName: ABI_PCS_wchar_t
Description: 4-byte
}
Attribute {
Tag: 20
Value: 1
TagName: ABI_FP_denormal
Description: IEEE-754
}
Attribute {
Tag: 21
Value: 0
TagName: ABI_FP_exceptions
Description: Not Permitted
}
Attribute {
Tag: 23
Value: 3
TagName: ABI_FP_number_model
Description: IEEE-754
}
Attribute {
Tag: 24
Value: 1
TagName: ABI_align_needed
Description: 8-byte alignment
}
Attribute {
Tag: 25
Value: 1
TagName: ABI_align_preserved
Description: 8-byte data alignment
}
Attribute {
Tag: 26
Value: 2
TagName: ABI_enum_size
Description: Int32
}
Attribute {
Tag: 30
Value: 4
TagName: ABI_optimization_goals
Description: Aggressive Size
}
Attribute {
Tag: 34
Value: 0
TagName: CPU_unaligned_access
Description: Not Permitted
}
Attribute {
Tag: 38
Value: 1
TagName: ABI_FP_16bit_format
Description: IEEE-754
}
}
}
}
Expected behavior
.elf contains correct attributes like if it was compiled with arm-none-eabi toolchain
Actual behavior
Unexpectedly for me it contains CPU_name equal to cortex-m0
Environment
Arm toolchain for embedded 21.1.x (was tested with with pre-compiled version (tarball from github) and with self-compiled, got the same result). My system is Ubuntu 25.10