Re: [PATCH, DARWIN] fix emutls exports in libgcc_s10.{4,5}.dylib

[Mike Stump <mstump at apple dot com>]

On Dec 10, 2008, at 10:23 AM, IainS wrote:
>  I wonder what a good long-term solution would be?

You can try something like:

#define  
REAL_LIBGCC_SPEC                                                   \
   "%{static-libgcc|static: -lgcc_eh - 
lgcc;                                \
      shared-libgcc|fexceptions|fgnu- 
runtime:                              \
       %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s. 
10.4)        \
       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s. 
10.5)        \
       -lgcc_eh - 
lgcc;                                                              \
      :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s. 
10.4) \
       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s. 
10.5)        \
       -lgcc_eh -lgcc}"

in config/darwin.h.  I'm thinking that most of the symbols should then  
come from the shared libraries as applicable, and newer routines in  
gcc_eh (like the thread emulation package, which has nothing to do  
with eh, right?) can be found.  Another possibility, would be to split  
out the tls emulation package from gcc_eh.  We avoid gcc_eh, so as to  
not pull in any routines that would shear with those in the system  
libgcc_s.