Minimum optimizations required to use inline functions

Hi,

I make extensive use of inline functions in my code, as below:

    extern inline void setClockLine(Bool value)
    { ... }

Sometimes I put these definitions in .c files, sometimes in .h files (I'm
not sure if that makes a difference, apart from scope).

The code builds and links at -O (or -O1, -O2) but does not link at -O0, I
get many linker errors like
   i2c.c:67: undefined reference to `setClockLine'

I wonder, what is/are the minimum flag(s) required to make inlining work?
If I use just these flags am I likely to get better debug experience? There
are no inline functions involved in the code I am trying to debug but I am
still having trouble stepping through the code.

I notice that newer versions of gcc have a -Og flag, does MSPGCC support
this?
I am running msp430-gcc (GCC) 4.6.3 20120301 (mspgcc LTS 20120406 unpatched)

I am using a combination of mspdebug, eclipse CDT, zylin embedded debug
native and msp430-gdb for debugging.

Thanks
Wayne

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