http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53922
Jack Howarth <howarth at nitro dot med.uc.edu> changed:
What |Removed |Added
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CC| |howarth at nitro dot
| |med.uc.edu
--- Comment #11 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-09-22
23:46:14 UTC ---
The new gcc.dg/torture/pr53922.c testcase fails on darwin. The darwin linker
developer had the following comments...
---------------------------------------
This is a feature that darwin does not support:
int y(int a) __attribute__ ((weak));
This is a function prototype marked "weak". In the linux world, this tells the
static linker it is ok for there to be no definition
+of the function y - just make a PLT entry as if it was found is some shared
object, and somehow it will be magically found at
+runtime.
Darwin uses two-level namespace where the static linker needs to record in
which dylib (shared object) each undefined symbol was
+found. If the symbol cannot be found at static link time, it is an error.
You can make this example work by adding
-undefined dynamic_lookup
to the link line which tells the static linker to assume any unresolved symbol
will be magically found at runtime.
-------------------------------------
Adding...
/* { dg-options "-Wl,-undefined,dynamic_lookup" { target *-*-darwin* } } */
is confirmed to allow all of the gcc.dg/torture/pr53922.c tests to pass at
-m32/-m64 on x86_64-apple-darwin11.
