Date: Fri, 13 Jan 2017 21:48:20 -0200 From: "Dr. Rolf Jansen" <rj@obsigna.com> To: freebsd-arm@freebsd.org Subject: Re: lldb on BeagleBone Black Message-ID: <34EB351A-3BA9-4D38-AF1C-96B065564C42@obsigna.com> In-Reply-To: <0ee18ae6-7588-97c9-bc04-3ad83b0c33b3@freebsd.org> References: <3DA2368D-AE7B-4D69-A634-2861D2EFA9AE@obsigna.com> <8FDE5FCC-9BA8-4601-A32E-04FBAB5FFBEA@obsigna.com> <0ee18ae6-7588-97c9-bc04-3ad83b0c33b3@freebsd.org>
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> Am 11.01.2017 um 14:43 schrieb Michal Meloun <melounmichal@gmail.com>:
> On 11.01.2017 14:20, Dr. Rolf Jansen wrote:
>>> Am 09.01.2017 um 00:59 schrieb Dr. Rolf Jansen <rj@obsigna.com>:
>>>=20
>>> I am running FreeBSD 12.0-CURRENT (BEAGLEBONE) #0 r311461: Fri Jan =
6 03:13:01 UTC 2017
>>>=20
>>> Does any of the llvm ports build on the BBB? I am looking for a =
working lldb, and pre-build packages are not available, and I fear there =
is a certain reason why not -- perhaps build failures?
>>>=20
>>> Therefore, is it actually possible to obtain a working lldb (with =
gui option) for armv6 by building e.g. devel/llvm-devel on my BeagleBone =
Black?
>>>=20
>>> Which of the llvm-ports would be most promising?
>>=20
>> I tried building devel/llvm-devel having the ports tree attached on a =
fast USB disk. After 36 h of building it bailed out because of some =
obscure error in the AArch64 code generator.
>>=20
>> Finally, I don't think that building any LLVM port is viable on the =
BBB, first because building takes forever. The BBB needs 1 minute for =
compiling a C++ file which got only 20 lines of code. Of course this =
comes because the C++ experts tend for some ingenious reasons to hide =
all the implementations into the headers which need then to be compiled =
again and again. Second, it doesn't make sense at all to build LLVM for =
all the possible targets on a machine which I will never ever use for =
cross-development.
>>=20
>> I will now try a non-ports build of LLVM 3.91 for the armv6 target =
only.
>>=20
>> Best regards
>>=20
>> Rolf
>=20
> Latest buildable llvm is 37. Any newer fails with overflow for
> R_ARM_CALL relocation.
> Michal
Michal, thank you very much for your hint.
I started with the non-ports build of LLVM 3.91 for the ARM target =
already once I received your message, and for the sake of satisfying my =
curiosity I let it go. As a matter of fact, building and installing =
completed successfully, only it took apprx. 48 h.
cmake .. -DLLVM_TARGETS_TO_BUILD=3D"ARM" -DCMAKE_BUILD_TYPE=3DRelease =
-G Ninja
ninja lldb install
However, the resulting lldb fails to run any target, even the simplest =
hello-world one crashes.
# lldb -- hello
(lldb) target create "hello"
Current executable set to 'hello' (arm).
(lldb) run
Process 592 launching
Process 592 launched: '/root/install/hello' (arm)
Process 592 stopped
* thread #1: tid =3D 100089, 0x000083a8 hello, stop reason =3D signal =
SIGILL: illegal instruction
frame #0: 0x000083a8 hello
hello`:
-> 0x83a8 <+0>: mov r5, r2
0x83ac <+4>: mov r4, r1
0x83b0 <+8>: mov r3, r0
0x83b4 <+12>: ldr r0, [sp]
I am now building LLVM 37 from the ports on the BeagleBone Black running =
FreeBSD 12.0-CURRENT. I will let you now the results.
Best regards
Rolf
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