Hey Khem! Thanks for your answer!
> >
> > I want to build my own dist and a sdk for it. The dist is working and is as
> > expected by the DEFAULT_TUNE of "armv7athf-neon", hardfp.
> >
> > But the TARGET_SYS in the bitbake header always tells me, that the
> > toolchain it uses is "...-gnueabi". Not "hf" in there?!
> > Thats the first thing what I can't figure out.
> We do not rely on target triplet. calling convention is determined by
> -mfloat-abi switch that is what OE relies on.
>
Ok. Understood. But even when I build with -mfloat-abi=hard (and the VFP
Register Entry is there with readelf, on build machine and target).
I can't do ldd helloworld on the target.
> >
> > The other thing is, when I now use the sdk, after successfully populating
> > it, the toolchain in there has the default -mfloat-abi=softfp ...
> > But even when I compile with -mfloat-abi=hard, the executable which I get,
> > segfaults on the target and ldd tells me "not a dynamic executable".
> > But readelf (on the target or host) tells me, that "Tag_ABI_VFP_args: VFP
> > registers" (which is detection for hardfp, right?).
> > And I miss the "hf" at the gnueabi in the sdk toolchain.
> Is target running the image build by you as well ? and prefereably
> build in same sandbox as the SDK
> if not then you need to figure out how the image was built. what is
> output of ls /lib/ld-*
It's a krogoth build with callconvention-hard enabled via DEFAULTTUNE.
And I have one recipe for the image and one for the sdk toolchain. So the
"Build" are two bitbake calls.
HOST with SDK:
$ . /opt/amana-sdk/sdk-environment
$ echo $CXX
arm-magna-linux-gnueabi-g++ -march=armv7-a -marm -mfpu=neon -mfloat-abi=hard
--sysroot=/opt/amana-sdk/4.0-1469450812/sysroots/armv7ahf-neon-magna-linux-gnueabi
$ ${CXX} -o helloworld helloworld.cpp
$ scp helloworld target:/usr/bin
TARGET:
# ldd /lib/libc.so.6
/lib/ld-linux-armhf.so.3 (0xb6f41000)
# ls -l /lib/ld-*
-rwxr-xr-x 1 root root 134396 Jul 22 10:56 /lib/ld-2.23.so
lrwxrwxrwx 1 root root 10 Jul 22 10:56
/lib/ld-linux-armhf.so.3 -> ld-2.23.so
# /usr/bin/helloworld
Segmentation fault
# ldd /usr/bin/helloworld
not a dynamic executable
# readelf -A /usr/bin/helloworld
Attribute Section: aeabi
File Attributes
Tag_CPU_name: "7-A"
Tag_CPU_arch: v7
Tag_CPU_arch_profile: Application
Tag_ARM_ISA_use: Yes
Tag_THUMB_ISA_use: Thumb-2
Tag_FP_arch: VFPv3
Tag_Advanced_SIMD_arch: NEONv1
Tag_ABI_PCS_wchar_t: 4
Tag_ABI_FP_rounding: Needed
Tag_ABI_FP_denormal: Needed
Tag_ABI_FP_exceptions: Needed
Tag_ABI_FP_number_model: IEEE 754
Tag_ABI_align_needed: 8-byte
Tag_ABI_align_preserved: 8-byte, except leaf SP
Tag_ABI_enum_size: int
Tag_ABI_VFP_args: VFP registers
Tag_CPU_unaligned_access: v6
# readelf -h /usr/bin/helloworld
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x85f4
Start of program headers: 52 (bytes into file)
Start of section headers: 42264 (bytes into file)
Flags: 0x5000400, Version5 EABI, hard-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 8
Size of section headers: 40 (bytes)
Number of section headers: 39
Section header string table index: 36
Any idea what's wrong here??
I don't get it.
Cheers,
Thilo
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