[llvm-commits] make utils/GenLibDeps.pl ignore 'D' lines from nm

[Duncan Sands]

Hi Nick,

> GenLibDeps is showing that .so files all depend on each other. 
> Technically, this hasn't caused a problem yet because neither libLTO.so 
> nor libHello.so fir the 'libLLVM* or LLVM*' file convention, so they're 
> both ignored by GenLibDeps entirely.
> 
> libLLVMgold is not so lucky. GenLibDeps concludes that everybody depends 
> on libLLVMgold since it shows a 'D' record for __dso_handle.

you are linking using gold, right?  The usual GNU linker marks this as 'd',
i.e. an internal symbol.  I've reported this to the gold devs [Bug gold/9836].

> In my 
> Debug/lib/ directory, the only D records come from .so files. The 
> attached patch makes GenLibDeps ignore all D entries, and removes the 
> apparent cycle encountered when building the gold plugin.
> 
> Comments?

How about just ignoring __dso_handle?  This might be enough to work
around the gold bug.  I don't much like the idea of ignoring all 'D'
symbols (externally visible globals with initial value).

Ciao,

Duncan.