Hi again,
Richard probably knows this but the gcc docs from the git master have
this:
'-march=NAME'
This specifies the name of the target architecture. GCC uses this
name to determine what kind of instructions it can emit when
generating assembly code. Permissible names are: 'c62x', 'c64x',
'c64x+', 'c67x', 'c67x+', 'c674x'.
I decided to build a tic6xx-elf toolchain from the git masters of
binutils-gdb,
newlib, and gcc just to make sure it woudld build ok. It will build for C
ok but
when C++ is enabled, it fails with an assembler error. Even though I have
never
used this processor and have no plans to, went ahead and filed an issue:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118941
--joel
On Tue, Feb 18, 2025 at 4:33 PM Joel Sherrill <joel.sherr...@gmail.com>
wrote:
>
>
> On Tue, Feb 18, 2025 at 3:04 AM Richard Biener via Gcc <gcc@gcc.gnu.org>
> wrote:
>
>> On Tue, Feb 18, 2025 at 7:10 AM Dan via Gcc <gcc@gcc.gnu.org> wrote:
>> >
>> > Hello!
>> >
>> > I'm trying to compile for Texas Instruments (TI) C6000 Digital Signal
>> > Processor (DSP) using GCC. I'm aware that TI has its own compiler, but I
>> > want to use GCC.
>> >
>> > The documentation indicates that GCC has *some* support for C6x DSPs, as
>> > shown in this link: https://gcc.gnu.org/onlinedocs/gcc/C6X-Options.html
>> >
>> > However, when I run a simple command like gcc -c main.c -march=c674x
>> > -I/include -Tlinker.ld, it fails with this error: main.c:1:0: error: bad
>> > value (c674x) for -mtune= switch.
>>
>
> Did you build a toolchain including gcc from source or did you just use the
> "gcc" program used to build native programs?
>
> It looks like you need to build a cross tool chain for the tic6x-elf
> target which
> will produce a gcc named tic6x-elf-gcc.
>
> Richard's comments also apply but I'm not sure you were trying
> a gcc targeting the tic6x
>
> --joel
>
>
>> >
>> > I've read on forums that GCC 4.7 has *some* level of support for C6X
>> DSPs,
>> > but even after installing GCC 4.7.4, it still doesn't work.
>> >
>> > Some forums also mentioned a GCC-based toolchain developed by
>> CodeSourcery
>> > (later acquired by Mentor Graphics, and subsequently by Siemens EDA)
>> that
>> > supported C6x DSPs. However, it's no longer available; I can't seem to
>> find
>> > any download links online.
>> >
>> > Could someone please advise on which GCC version is compatible with C6X
>> > DSPs? Any guidance would be greatly appreciated.
>>
>> All of them. Well, there's the c6x backend but it's not actively
>> maintained.
>> I don't see a -mtune switch for the port, so I do wonder whether you built
>> the compiler from source or got it from somewhere else.
>>
>> Richard.
>>
>>
>> >
>> > Thanks in advance!
>>
>
