clang and static linking?

Dimitry Andric dim at
Fri Nov 9 17:01:49 UTC 2012

On 2012-11-09 17:45, Roman Divacky wrote:
> On Fri, Nov 09, 2012 at 08:43:04AM -0800, Steve Kargl wrote:
>> I'll try this shortly.  Does this mean that we need to build
>> all *.a libraries where a weak reference may occur with this
>> switch?
> No, this has nothing to do with llvm integrated asm.
> So far it looks like gcc always inline "isnan" even at O0 while
> clang does not. We are trying to figure out the solution.

No, it is not related to the optimization level.  It looks like isnan()
is a builtin for gcc, but not for clang.  The isnan() macro expands to a
isnan() call for a few of libm's objects:


> Maybe use __builtin_isnan instead of isnan in the isnan macro expansion?

Either that, or if people prefer to use libc's isnan() implementation,
make sure gcc also calls it instead.

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