Created attachment 519738 [details]
test case with instructions inside

icu fails to build for ARM on f14:

/usr/bin/ld: ../../make[2]: Leaving directory `/builddir/build/BUILD/icu/source/tools/makeconv'
bin/makeconv: hidden symbol `__sync_val_compare_and_swap_4' in /usr/lib/gcc/armv5tel-redhat-linux-gnueabi/4.5.1/libgcc.a(linux-atomic.o) is referenced by DSO
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: ld returned 1 exit status

This is somehow related to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40134
however, the patches mentioned there are shipped in F14 gcc. hmm.

I narrowed this down to a small test case, which I will attach. To summarise, when using GCC's inbuilt atomic functions in a DSO linked with g++, the atomic function code doesn't get copied from libgcc.a into the output DSO like it should. If linking with gcc instead of g++, it works fine.

The test case is already confirmed to work on F15, so even though this is a gcc bug, I think it would be acceptable to work around this in F14 within the icu package, and dedicate our time to moving to F15+ ASAP.

I'm attaching my proposed workaround. Also, an already-upstream patch is needed from http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=589076

then it builds OK :)