[cfe-dev] How do I specify a specific PowerPC CPU to clang?

[Richard Pennington]

Hal,

That figures. I'm currently running r158294. I'll update. 

-Rich

Sent from my iPhone

On Jun 18, 2012, at 7:09 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> Sean, Richard,
> 
> I added -mcpu support for PPC to trunk clang in r158334. Does this not
> work for you?
> 
> -Hal
> 
> On Mon, 18 Jun 2012 18:47 -0500
> Richard Pennington <rich at pennware.com> wrote:
> 
>> On Monday, June 18, 2012 04:32:15 PM Sean Payne wrote:
>> 
>> I want to have clang and then llvm generate code for a specific CPU.
>> Eg, suppose I want it to build for the PowerPC 750 CPU, how am I
>> meant to tell clang  
>> 
>> 
>> I'm running the latest latest trunk versions of clang and llvm on
>> windows and I'm running clang in the debugger.  I've tried all sorts
>> of combinations, but can't get the "CPU" member of TargetOptions to
>> be populated.  e.g. here are some arguments I've tried that didn't
>> work: -target ppc750-bla-darwin   -S c: \projects\llvm_750\test1.cpp
>> -o -
>> 
>> 
>> Thanks,
>> 
>> 
>> Sean 
>> 
>> 
>> Hi Sean,
>> 
>> Interesting you should ask this question. Today I added an -mcpu
>> option to my version off clang/LLVM:
>> 
>> [~/ellcc] main% bin/ecc -target ppc-ellcc-linux hello.c -v -mcpu=750
>> clang version 3.2
>> (http://ellcc.org/svn/ellcc/branches/newlib/llvm/tools/clang 2979)
>> Target: ppc-ellcc-linux
>> Thread model: posix
>> "/home/rich/ellcc/bin/ecc" -cc1 -triple ppc-ellcc-linux -S
>> -disable-free - main-file-name hello.c -mrelocation-model static
>> -mdisable-fp-elim -fmath-errno -mconstructor-aliases -msoft-float
>> -target-cpu 750 -target-linker-version 2.21.53.0.1
>> -momit-leaf-frame-pointer -v
>> -resource-dir /home/rich/ellcc/bin/../libecc
>> -fmodule-cache-path /var/tmp/clang-module-cache
>> -fno-dwarf-directory-asm -fdebug-compilation-dir /home/rich/ellcc
>> -ferror- limit 19 -fmessage-length 87 -mstackrealign -fno-signed-char
>> -fgnu-runtime - fobjc-runtime-has-arc -fobjc-runtime-has-weak
>> -fobjc-fragile-abi - fdiagnostics-show-option -fcolor-diagnostics
>> -o /tmp/hello-KzHR2J.s -x c hello.c clang -cc1 version 3.2 based upon
>> LLVM 3.2svn default target x86_64-unknown- linux-gnu #include "..."
>> search starts here: #include <...> search starts here:
>> /home/rich/ellcc/bin/../libecc/include
>> /home/rich/ellcc/bin/../libecc/usrinclude/ppc/linux
>> /home/rich/ellcc/bin/../libecc/usrinclude/ppc
>> /home/rich/ellcc/bin/../libecc/usrinclude/linux
>> /home/rich/ellcc/bin/../libecc/usrinclude
>> End of search list.
>> "/home/rich/ellcc/bin/ppc-elf-as"
>> -o /tmp/hello-ZIWKej.o /tmp/hello-KzHR2J.s -a32
>> "/home/rich/ellcc/bin/ecc-ld" -m elf32ppc --build-id
>> --hash-style=gnu -e _start --eh-frame-hdr -Bdynamic
>> -dynamic-linker /usr/libexec/ld.so -o
>> a.out /home/rich/ellcc/bin/../libecc/lib/ppc/linux/crt0.o /home/rich/ellcc/bin/../libecc/lib/ppc/linux/crtbegin.o
>> -nostdlib - L/home/rich/ellcc/bin/../libecc/ldscripts/linux -
>> L/home/rich/ellcc/bin/../libecc/lib/ppc/linux -
>> L/home/rich/ellcc/bin/../libecc/lib/ppc /tmp/hello-ZIWKej.o
>> -Telf32ppc.x -lc -
>> lcompiler-rt /home/rich/ellcc/bin/../libecc/lib/ppc/linux/crtend.o
>> [~/ellcc] main% 
>> 
>> Currently the TOT doesn't support -mcpu for the PowerPC.
>> 
>> -Rich
> 
> 
> -- 
> Hal Finkel
> Postdoctoral Appointee
> Leadership Computing Facility
> Argonne National Laboratory