[LLVMdev] llvm-gcc and -march

[Bob Wilson]

The -arch option is handled by Apple's "driver-driver", and the MacPorts build is probably not using that.  See the driverdriver.c source file in llvm-gcc for details.

On Aug 22, 2011, at 3:08 PM, Nichols A. Romero wrote:

> Here is some more info:
> 
> [naromero:~/pmr] naromero% llvm-gcc -v
> Using built-in specs.
> Target: x86_64-apple-darwin10
> Configured with: ../llvm-gcc-4.2-2.9.source/configure
> --prefix=/opt/local --host=x86_64-apple-darwin10
> --enable-llvm=/opt/local --enable-languages=c,c++,objc,obj-c++,fortran
> --libdir=/opt/local/lib/llvm-gcc42
> --includedir=/opt/local/include/llvm-gcc42
> --infodir=/opt/local/share/info --mandir=/opt/local/share/man
> --with-local-prefix=/opt/local --with-system-zlib --disable-nls
> --program-prefix=llvm- --program-suffix=-4.2 --with-gmp=/opt/local
> --with-mpfr=/opt/local --with-build-time-tools=/usr/bin
> --with-gxx-include-dir=/usr/include/c++/4.2.1 --with-slibdir=/usr/lib
> Thread model: posix
> gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build)
> 
> I tried this on a simple file using your syntax and it still didn't work.
> [naromero:~/pmr] naromero% llvm-gcc -march=nocona pow.c -S -arch x86_64
> cc1: error: unrecognized command line option "-arch"
> 
> Not that this macport is using LLVM 2.9.
> 
> On Mon, Aug 22, 2011 at 4:46 PM, Eric Christopher <echristo at apple.com> wrote:
>> Still nothing here:
>> 
>> [yendi:~] echristo% llvm-gcc -march=nocona foo.c -S -arch x86_64
>> [yendi:~] echristo%
>> 
>> So, perhaps you could send more information? Or bug the mac ports people.
>> 
>> -eric
>> 
>> On Aug 22, 2011, at 2:44 PM, Nichols A. Romero wrote:
>> 
>>> This comes up when trying to compile Valgrind, here is the full compile line:
>>> 
>>> /opt/local/bin/llvm-gcc-4.2 -Wbad-function-cast -Wcast-qual
>>> -Wcast-align -fstrict-aliasing \
>>>              -arch x86_64 -O2 -g -Wall -Wmissing-prototypes -Wshadow
>>> -Wpointer-arith -Wstrict-prototypes -Wmissing-declarations
>>> -Wno-format-zero-length -fno-strict-aliasing -mmacosx-version-min=10.5
>>> -fno-stack-protector \
>>>                               -O -S -o auxprogs/genoffsets.s \
>>>                                        auxprogs/genoffsets.c
>>> 
>>> On Mon, Aug 22, 2011 at 4:39 PM, Eli Friedman <eli.friedman at gmail.com> wrote:
>>>> On Mon, Aug 22, 2011 at 2:34 PM, Nichols A. Romero <naromero at gmail.com> wrote:
>>>>> Hi,
>>>>> 
>>>>> I apologize if I am not asking on the right mailing list.
>>>>> 
>>>>> I am using the llvm-gcc4.2 from MacPorts.
>>>>> https://trac.macports.org/browser/trunk/dports/lang/llvm-gcc42/Portfile
>>>>> 
>>>>> llvm-gcc does not seem to accept the -march flag. This is the error,
>>>>> I got:
>>>>> 
>>>>> cc1: error: unrecognized command line option "-march"
>>>>> 
>>>>> The port developer asked me to find out if this is a known issue.
>>>> 
>>>> llvm-gcc 4.2 should support almost exactly the same command-line
>>>> options as gcc 4.2, including -march.  How exactly are you getting
>>>> this error?
>>>> 
>>>> -Eli
>>>> 
>> 
>> 
>> 
> 
> 
> 
> -- 
> Nichols A. Romero, Ph.D.
> Argonne Leadership Computing Facility
> Argonne, IL 60490
> (630) 447-9793
> 
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