Install libmad on Mac OS X Lion: "error: CPU you selected does not support x86-64 instruction set"

Question

I am trying to install a program that requires the libmad (MPEG audio decoder library) library on Mac OS X 10.7 Lion, but installing libmad.0.15.b results in this error:

version.c:1: error: CPU you selected does not support x86-64 instruction set

That library installs fine on OS X 10.5. Is it a 64-bit compatibility issue? I can't find any specific instructions or documents regarding installing on Lion. Any suggestions? Thanks.

Acidimeter

Answer 1

By default, the C and C++ compilers on Snow Leopard and newer generate 64-bit binaries, not 32-bit as in older versions of OS X. The libmad configure script apparently hasn't been changed to cope with this, and so generates build commands that cause the 32/64 bit conflict you see.

That means one way to fix it is to force a 32-bit build.

But, it's easy enough to clue the configure script into the correct CPU type. For Lion:

$ ./configure x86_64-apple-darwin11.3.0

For Snow Leopard, change the kernel version:

$ ./configure x86_64-apple-darwin10.6.0

Rubadub

where do you copy it to next? /sw/bin? – Scarificator

Say sudo make install. That will set the library up correctly. Don't just copy raw .dylib files around. – Rubadub

+1 FYI: for Mountain Lion: ./configure x86_64-apple-darwin12.2.0 and more generally, uname -a will tell you the darwin version so you can sub in appropriately for future versions. – Roxie

Answer 2

This is an old question, but I believe I have a better answer than Warren Young's.

By default, libmad-0.15.1b is configured to default to using -march i486 when it is built on a *86 architecture that it doesn't recognize. You can disable this behavior, and get it building on your 64 bit Mountain Lion platform, by changing this line

        i?86-*)           arch="i486" ;;

in ./libmad-0.15.1b/configure.ac to this line:

        i?86-*)           arch="" ;;

This should enable libmad to build for whatever architecture the system actually is, instead of forcing i486.

Hacksaw