[SOLVED] G++ Error.

lupusarcanus · 04-01-2011, 08:55 PM

Code:

Andrew@Mac:~$ g++ -march=athlon64-sse3 -O2 Projects/omgarrays.cpp -o Desktop/omg
Projects/omgarrays.cpp:1: error: bad value (athlon64-sse3) for -march= switch
Projects/omgarrays.cpp:1: error: bad value (athlon64-sse3) for -mtune= switch

http://gcc.gnu.org/onlinedocs/gcc/i3...4-Options.html

Quote:

Originally Posted by GNU

k8-sse3, opteron-sse3, athlon64-sse3
Improved versions of k8, opteron and athlon64 with SSE3 instruction set support.

Why am I getting this error?

lupusarcanus · 04-01-2011, 08:58 PM

Also,

Code:

Andrew@Mac:~$ g++ -march=native -O2 Projects/omgarrays.cpp -o Desktop/omg
Projects/omgarrays.cpp:1: error: bad value (native) for -march= switch
Projects/omgarrays.cpp:1: error: bad value (native) for -mtune= switch

http://gcc.gnu.org/onlinedocs/gcc/i3...4-Options.html

Quote:

Originally Posted by GNU

native
This selects the CPU to tune for at compilation time by determining the processor type of the compiling machine. Using -mtune=native will produce code optimized for the local machine under the constraints of the selected instruction set. Using -march=native will enable all instruction subsets supported by the local machine (hence the result might not run on different machines).

WTF?

Nominal Animal · 04-01-2011, 09:49 PM

Quote:

Originally Posted by lupusarcanus

Also,

Code:

Andrew@Mac:~$ g++ -march=native -O2 Projects/omgarrays.cpp -o Desktop/omg
Projects/omgarrays.cpp:1: error: bad value (native) for -march= switch
Projects/omgarrays.cpp:1: error: bad value (native) for -mtune= switch

What version of g++ are you using? Please tell what

Code:

g++ --version
gcc --version

report. It's quite possible you're using an old or a butchered version of gcc.

lupusarcanus · 04-01-2011, 09:57 PM

4.5.2

lupusarcanus · 04-01-2011, 10:07 PM

Hey, I found the solution. While I was using Mac OS X and Xcode's version of GCC, I used MacPorts to install vanilla GCC 4.5.2. Only, I aliased gcc and not g++. So when I was trying to run that command, it was with Apple's version not vanilla GCC. With 4.5.2 vanilla it works just fine. Sorry about that. Dumb, obvious mistake.