Question

I am getting the following compilation / link error:

ld: 0711-317 ERROR: Undefined symbol: .__gcc_qsub
ld: 0711-317 ERROR: Undefined symbol: .__gcc_qmul
ld: 0711-317 ERROR: Undefined symbol: .__gcc_qadd

What library holds those?

Any ideas?

Lynton

Answer 1

Here’s a total stab in the dark…

A Google search picked up this header from Apple. It looks like its part of libgcc (which is not Apple specific, that’s just Apple’s implementation), and that its used for doing long double arithmetic in software. Try adding -lgcc to your build process.

According to the GCC manual, you can also explicitly force static or shared linkage of libgcc with either of these options: -shared-libgcc or -static-libgcc.

Edit: As Nemo has pointed out, if you use gcc to link instead of manually invoking ld yourself, as libgcc will then be linked automatically.